https://www.markbowers.org/more-projects daily 0.75 2016-11-28 https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411436696928-6NZFM0VDKEVI1QZEUZGI/image-asset.jpeg More Projects Oscilloscope wiring diagram, vertical configuration https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411436589308-6X6ZINMURLLA2PGLSBLW/image-asset.jpeg More Projects CRT functional diagram https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411436593967-67B8H4EU5XS0OH936YZD/image-asset.jpeg More Projects My old IBM PCJr monitor https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411436929506-OMTG6E5BEFPQ7EZGO5KV/image-asset.jpeg More Projects Vertical Configuration (1 height = 60Hz) https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411436395668-EJL81NZE901YAJSB8825/5164_1099210481434_6113365_n.jpg More Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411436395658-26IKX4G98EEGNAHWFY54/5164_1099211161451_1730258_n.jpg More Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411436395868-CFAUGZEC15AJ3H9HGBK8/5164_1099211201452_5483036_n.jpg More Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411436395819-WG9S72MIOQKACHS5BAZS/1931357_1019868817942_7507_n.jpg More Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411436784421-ZJQNRY4GG8GEF44ZPU47/image-asset.jpeg More Projects Horizontal Configuration (1 width = 31.5KHz) https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411436651592-4TSUWD3YF9YNSAX333SB/image-asset.jpeg More Projects IBM PCJr monitor guts https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411436995227-9BBLPZ5YR7SJU1XZ4DDG/osc1.jpg More Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411436995315-PIBLV111AVCWL32PLWR7/osc3.jpg More Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411436995213-BHFCJC48IK6HM9KME03B/osc2.jpg More Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411663968316-POFGXSYK3F5COPAOYXAP/ultrasonic.jpg More Projects Ultrasonic Sensor (For System Feedback) https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411664383812-1I4XLUUH0I5V3RMX266L/image-asset.jpeg More Projects Sliding Membership Function https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411663761084-B51TUU1GD5JKG68NRIXU/image-asset.png More Projects Membership Function for Ball Speed https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411663671387-2WS14DXW7AITVA5J8SIA/image-asset.jpeg More Projects Levitating Ping-Pong Ball Setup https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411663778027-H6K2WU0NGL6NVN69J8NM/image-asset.png More Projects Output Function https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411663744876-W126XTEWT7FY5Z5NVOEM/image-asset.png More Projects Membership Function for Ball Position https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411663907994-S8CMLSSSSQO6J7M68TJQ/image-asset.jpeg More Projects Infrared Sensor (For User Input) https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411663834147-9NDPCB2U5AB91LSN94OL/image-asset.png More Projects Fuzzy Karnaugh Map https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411664093969-AFMRPCEX4UPYPF0KDWE0/hcs12.jpg More Projects MiniDragon HCS12 board https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411664056807-RWP6T2ZRIR4VDEHKGRE7/image-asset.jpeg More Projects Duct Fan https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413651552575-L2O6JK2C5DJ72F4KHX1L/image-asset.jpeg More Projects Nixie Clock using the HCS12 https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413515374278-HGZCSOPPDAQTL75X0GM9/tetris.jpg More Projects Accelerometer Tetris with the HCS12 https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413515243163-8OG34ZIUIP4C9OHTSUUE/image-asset.jpeg More Projects Bit-banging VGA on the HCS12 https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413650045285-0WICHQI1MM3W539MRUUK/image-asset.jpeg More Projects Select/start control pins https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413650484839-FI5D635T7079EKWD1JF3/image-asset.jpeg More Projects Back of the case, revealing the game cartridge. The plastic back panel conceals this mess. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413649810372-5TYN9BK9NQUY0KD5A98P/image-asset.jpeg More Projects Back of the GBC motherboard https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413649963557-2WKVAU0OL0PXWQ40M50V/image-asset.jpeg More Projects Directional pad control pins, determined by trial-and-error. These pins are "active low" meaning they are activated by grounding them. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413650341443-ZNKGPDV7LG6B1FBUSMAU/ticontacts.jpg More Projects Heavily modified back piece https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413649839842-POE682MX76USF3RXAD4V/image-asset.jpeg More Projects Verifying that the GBC still boots https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413650290285-WVH5863UEWS1TRGACWU0/image-asset.jpeg More Projects GBC board on top of the TI-83 innards. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413649935011-ITIOYK20YIKKRYN4QXL9/image-asset.jpeg More Projects Reverse side of the TI-84 next to the GBC innards. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413650114993-AEYD3IF8H2MV9CRC0K41/image-asset.jpeg More Projects Keypad contact board from a broken TI-83, wired out to the GameBoy motherboard. 2nd → A ALPHA → B arrow keys → DPAD enter → start + key → select https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413650016525-AZW4GI06KERDNWGXQAAI/image-asset.jpeg More Projects A/B control pins https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413650269666-CHHNEWWHRMO7OP1E267E/image-asset.jpeg More Projects All hooked together. Somehow, it worked. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413650393915-I121DDQC2NFM5QN9T35E/image-asset.jpeg More Projects All put together! Pokemon is visible on the screen. Notice the clear button is upside down...   https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413649865289-9QK8NFRZ3NXAG66Q39YN/image-asset.jpeg More Projects Size comparison of my TI-84 next to the GBC innards. I did not use the TI-84, but rather a broken TI-83 I got from a friend. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413650862061-EAHG9P7WLKMAQ4M57HFG/image-asset.jpeg More Projects Another shot of the game running. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413649675271-HYGTEYR70KIL1F4NUVSQ/image-asset.jpeg More Projects Front of the GBC motherboard https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413658611552-YT4DFPEL1JYMJ46I0TAY/image-asset.jpeg More Projects 160x120 color transmission (24 seconds) https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413659253310-5UE1F0HW6C1H0QC67HLU/image-asset.png More Projects Sonogram of the preamble transmission https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413658978877-KCZBGKZYMR5MMWJCDQQN/image-asset.png More Projects Sonogram of the data transmission https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413652919969-7A1Z5O0PJ4MXG219GB9R/image-asset.gif More Projects Amplitude Modulation https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413658576210-B6PIFYX8HQYLFZIH8ZOG/color_small.jpg More Projects 160x120 black and white transmission (8 seconds) https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413658738810-8P8VNETRNENCN6XBN98L/image-asset.jpeg More Projects Laser Transmitter Setup https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413659403814-TTAHWXUXEITZTBIWJSBK/image-asset.jpeg More Projects AM laser transmitter schematic https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413645143459-8C1IRW5L97Q368QJ3J5A/rick_roll.png More Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411436206515-VWZ6JB9J08A31P33M61X/5164_1099211161451_1730258_n.jpg More Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411664508056-9IKYH92KC8MFEMLVST20/setup.jpg More Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413650794407-9WGMYBEBTP085MRHHSMT/215916_1003628891954_6481_n.jpg More Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413652540666-SDWUDR2FPPM29W6T539L/color_small.jpg More Projects https://www.markbowers.org/projects daily 1.0 2023-04-30 https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411255881279-O44O9PWNJSBNEJNLXR2F/image-asset.jpeg Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411253253761-BUQNFYL9V2DFC9TS8G1O/image-asset.jpeg Projects HV Capacitor Bank https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411253336560-894VSAULXDDLV6TWP67L/image-asset.jpeg Projects Primary Coil https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411255079034-BKWNHWV8WFNV5ZYDE12K/RQgap.jpg Projects Spark Gap https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411250153612-V4QTIDRKIUU6V4I4L257/tesla-schematic Projects Tesla Coil Schematic Source: Wikipedia https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411255598580-IDROHDUE9FQ9S74AY3FZ/image-asset.jpeg Projects Neon Sign Transformer (Top View) https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411253431994-1X5AYPK49XN35CCK5AWP/image-asset.jpeg Projects Discharging to ground https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411253236187-H4EXOC2QMWBNMTFJKGSQ/image-asset.jpeg Projects Wrapping the Secondary Coil https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411255104572-K2SZSZITWA9QAEEZ7J3B/image-asset.jpeg Projects Spark Gap Blower https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411253403930-RM9GDM9VRXLWYOX1WPR5/image-asset.jpeg Projects Completed Tesla Coil https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411253269418-8QVOVX6B0E2Q3WKJCD0G/image-asset.jpeg Projects Torus https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411255521946-5UF20UF0N9BZ6ATM1G57/NST.jpg Projects Neon Sign Transformer Specs https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411255891312-OEV873DYVGBO29D7LTCG/image-asset.jpeg Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411249676805-U0CH4CZI7DQH6KHDFCYQ/tesla-apparatus Projects Completed Tesla Coil https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411253223925-ZNFWHZ8R1529NIZGSNJG/image-asset.jpeg Projects Tesla Coil Base https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411304154642-RTEOFMVMSKNPLSXF4VOC/image-asset.jpeg Projects Mandelbrot Processor Diagram https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411427132497-QSU5GY7IEM8OW7OQ096T/image-asset.jpeg Projects Running on a Nexys 2 FPGA board https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411427091201-XUH467SK4HCGFFV60LHX/image-asset.jpeg Projects Mandelbrot home screen, as rendered on an FPGA https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411304235743-DDGTAPH7MLPB4D4BYTZ9/image-asset.png Projects Mandelbrot Set Zoomed (C++ test application) https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411304340343-H4AJ6Y33HJM3MO9K76KW/state_diag_plot.png Projects Plotting State Machine https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411428896829-SN7HE8GXTYQ67ZU4ACEH/image-asset.jpeg Projects Zoomed on the Nios II version https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411427386181-BJGSV6A9YNYYOP96K7DD/image-asset.jpeg Projects Sample Zoom Sequence https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411428871637-HX7UJF84OS9FPI2DS47L/image-asset.jpeg Projects Home screen rendered on the Nios II version https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411266005770-NRLJGG82LXT04YIVTCLU/fpga_mandelbrot_2.jpg Projects Mandelbrot Set https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1414167137129-WCEXM212KYBFP2LV85I7/image-asset.jpeg Projects Click to see my grandpa's Mandelbrot slides! https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411304040018-X6E0BO9NBIQ1TLSZXHJ2/image-asset.png Projects Mandelbrot Set (C++ test application) https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411304379257-P8LFRFM08ON36NKN703D/state_diag_zoom.png Projects Zooming State Machine https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411428710979-YJCEGZ0QCPO2U9CSEPLM/image-asset.jpeg Projects By the time you zoom into the Mandelbrot set as far as our FPGA-based system will take you (2^23 zoom factor), the original Mandelbrot would be the size of the continental United States! https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1450299098971-EEU0H0ZQ1LF66B401O5G/mercury_front.jpg Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1450299106316-KLOVLZB6ZQPCTOYKFYHP/mercury_back.jpg Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411431266766-2LT63EQYZAQ5UG6R9927/image-asset.jpeg Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411429933571-P0PP5J6GBTC38VJB2YKV/fpga_mandelbrot_1.jpg Projects Mandelbrot Home Screen https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411429513873-MAD7KIWC5TK28I022T7X/image-asset.png Projects Multiplier pipeline https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411430066173-BJ09NK38DT0DHP8F2YLL/image-asset.jpeg Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411429993165-Y7VH2NKZLB7FNFL3V5AB/image-asset.jpeg Projects Rendered at 255 iterations https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411429454291-FTUXLSH1B6H14UIEE95M/image-asset.jpeg Projects Altera DE2 board https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411430008211-XA49TCGX9TM6ZW5UTU33/image-asset.jpeg Projects Rendered at 65535 iterations https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411430101051-WJZ6NHYJ8OTJKAB0KI0B/image-asset.jpeg Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411429346745-S974MPNI1ETOBNQXN1W2/image-asset.jpeg Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411431609641-FQ4HI9VUGNK3OG1U0E49/image-asset.png Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411431628561-E91W8CHOJWIO0B6L5EX5/image-asset.png Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411435661100-F3ETS2LAC0UY2G5V4KOF/tetronimoes.png Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411435298735-QAI0IK5LY7PSSV1XEC4N/image-asset.png Projects Interrupt Flowchart https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411435245469-VEMO0KI15DBBNG55W6SH/image-asset.jpeg Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411435694412-OEVX0W9G6MLHW1HW2OQ1/image-asset.png Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412722324204-N3I3U4A0G1JAMY69NPBH/image-asset.jpeg Projects All four Nixie tubes & RGB LEDs soldered down. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412722544991-KXMZ6VDVCR4WXYRSVBMQ/image-asset.jpeg Projects Another close up of the Nixie tubes. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412721881881-H9ZK2WNQV425YDEUCP69/image-asset.jpeg Projects Completed Nixie Clock https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412722454716-NQC22T62U57XP2XWL3AH/image-asset.jpeg Projects Bottom of the lower board (microcontroller & timing circuitry) https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412722366145-50D5TOOKIV2IA53I04NY/image-asset.jpeg Projects RGB LEDs soldered. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412722537518-U5LZYMHL550ZI9QIHIKM/image-asset.jpeg Projects Clock opened, exposing the innards. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412721983404-ZFQA1ZJRHX3UBOD45UWA/image-asset.png Projects Display board: High-side HV transistors (upper left), LED transistors (upper right), low-side BCD-to-tube decoder (bottom right) https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412722529022-L643DY5M57LR32JSI19H/image-asset.jpeg Projects Rear end of the clock. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412721963805-ZT18AX5HR8IJZDAXI56Y/IMG_0601.JPG Projects Nixie anodes & cathodes soldered. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412722346005-UCXQBU5H9I5W0MU8YT1I/image-asset.jpeg Projects Checking if everything fits. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412722488096-8ATIRWLV7P49LTMQ63K3/image-asset.jpeg Projects Finished product! https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412721898295-BBZ50GKC3SUDA2AG535E/image-asset.jpeg Projects Testing a single IN-14 with an RGB LED. 180VDC tube power supply is provided by the red DC-DC converter board. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412721916295-TXRF3JIQV39KCK7Y7L5C/image-asset.jpeg Projects A hole was drilled in the plastic guard to allow the LEDs to be placed below each tube. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412722552467-1A8CBYZPKVH527BMQ1HB/image-asset.jpeg Projects Nixie clock on a sunny day. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412722462464-1QUAK7ERRDTETZTHIEF4/image-asset.jpeg Projects Everything stuck into the case. Still running test code. Black plastic guard not yet glued down. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412722400090-2LPIVLYOTDLKM0TQ82BS/image-asset.jpeg Projects Display board with pinout notes https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412722426975-3OWF3XKX2FS9866AMNG6/image-asset.png Projects Microcontroller socketed & connected to display board. Testing LED colors. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412722411121-VA4QCUKMQMNYGUWVJZS8/image-asset.jpeg Projects Testing display board. Microcontroller is a Wytec Dragonfly12 (HCS12 DIP module) https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412722496861-EWDD1YTVTQ0ZMNL584UB/image-asset.jpeg Projects Close-up of the Nixie tubes. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412722471592-KAWTA1A3AWCHOXW45S3F/image-asset.jpeg Projects Innards of the clock. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412722303705-I1K3H4IPFQHGP86KFZLK/image-asset.jpeg Projects Testing all four IN-14 tubes on a breadboard! https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412721927488-C1TJGC3MWWU2CU87PQ6H/IMG_0574.JPG Projects Soldering the Nixie tubes & RGB LEDs onto a perfboard. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412722438049-QVXSFKNGEKN7N035318W/image-asset.png Projects Timing circuitry added to lower board. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412722509626-R2PKXLGP40FZ7P7NMZZO/image-asset.jpeg Projects The clock can be set to alternate between the date & time. Here it is on the mantle on Christmas Eve. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411688009109-JCLOVU7KOIZYWZGSCCQC/spim.png Projects Color shift registers https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411689385127-XZPSLFW8TJZGYUQ99RAF/image-asset.png Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411687012037-PQKLBRPQCT4JSMTXKWHT/image-asset.png Projects PSoC VGA demo display https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411688614951-OY6UJW2828M4LW0DZ8MZ/display_coordinates.png Projects Display Coordinates https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411689913698-X1MIY8EAX00SUNMYG8ML/image-asset.png Projects PSoC-1 resource usage. A good chunk of RAM is left over, but the CPU is almost always busy feeding the color shift registers! https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411688849611-9MEYLBPUFNHKYM64L8I8/timing.PNG Projects VGA timing (red arrows indicate ISR firing) https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411688691299-U257HD0C5J9JCZGSBF22/image-asset.png Projects Addressing Scheme https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411688994725-P40ZD68WPRPL8GQ0A4B5/image-asset.png Projects Simplified horizontal ISR diagram https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411689802725-PG1T9K7XH49KQ3KCTWIR/image-asset.png Projects Mandelbrot set rendered & displayed on the PSoC-1 https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411688185957-7359LQYESURTCARLS2O9/image-asset.png Projects Digital Blocks Configuration (click for larger view)   https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411687274305-9BM6HUQECDHTULBOCWIK/image-asset.png Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411689409773-W2JUK0UKM54OI8RBTYRW/code2.png Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412723449763-5O9NCW444AEX24AVA8AN/image-asset.jpeg Projects Wirelessly-powered LED Christmas tree https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412723665195-KEOUUKXQXXC5BQKTA6RI/image-asset.png Projects Wirelessly-lit LED Christmas tree on its base. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412723496149-7Z92HAPC2DJQYZ3IO7RD/image-asset.png Projects Secondary capacitor hiding beneath the Christmas tree. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412723625525-0882S5SCHZ9MCXC2V3PP/image-asset.jpeg Projects Wireless transmitter circuit beneath the base https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412723467846-0TQY9KRC0ISNPGBKGXA0/IMG_0290.JPG Projects Christmas tree still lit after being held away from the base. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412723481260-Q9DNEAW3S59Q2KB6JECF/IMG_0284.JPG Projects Christmas tree removed from the base. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412699118417-Z1M4EBFDNMF2YTJ7WAIK/resonant.png Projects Resonant Inductive Coupling Schematic Source: Wikipedia https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412723137683-M3R6X5B5JY3KOVPQ5UC9/image-asset.jpeg Projects RGB LED mounted beneath a Nixie tube https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412723089370-J4FNCAWTPIUYS96QMMRN/image-asset.jpeg Projects IN-14 Nixie tubes mounted on removable PCB sections https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412723157264-LU5AK2LBQHHIRV2I7YB4/image-asset.jpeg Projects Testing with two Nixie tubes & LEDs. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412723192953-82PU6PQ8A765T96C9HDF/image-asset.jpeg Projects Ghosting of the previous digit! This problem was eliminated by added dead-time to the Nixie tube multiplexing circuit. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412723229423-6C2DC9W6PZSNOR3VSOXC/image-asset.jpeg Projects Underside of the completed Nixie clock. Next time I do this, I am definitely making a PCB! This takes way too long to solder... https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412723051995-EJKOCRG1FIMG7BORV7KT/IMG_0291.JPG Projects Completed six-tube IN-14 Nixie clock https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412723149213-PE0XF3JG65B9P2J0STL8/image-asset.jpeg Projects Testing with one Nixie tube. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412723220368-ME42Q2O9MDL32PRLJNXB/image-asset.jpeg Projects Completed Nixie clock! https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412723201554-MMOLSCWWSSVCIBMWEE35/IMG_0276.JPG Projects Mounting the clock in a plexiglass case. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412723174498-QU2JMBVZ4I3PUUC3TRC7/image-asset.jpeg Projects Detailed view of the TLP627 optoisolators and K155NA1 digit driver. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412723182317-XXAFHELPF71O5NUMOL43/image-asset.jpeg Projects All six tubes wired up! https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412723099831-HGCLFWEMXILQJG8M28YJ/image-asset.jpeg Projects Nixie tubes mounted on a protoboard https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412723109894-A5U1CA2HK8OKZP2C07KN/image-asset.jpeg Projects All six Nixie tubes mounted on the protoboard https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412723166581-NVJ5LAISNRCRG6UAUXJ4/image-asset.jpeg Projects Partially-completed soldering on the underside of the protoboard. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412723252123-DRIKQYPNOKBFYHVDY96H/image-asset.jpeg Projects Top view of the completed Nixie clock. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412723261498-AHKOFW1WN4H5HZAWLGQI/image-asset.jpeg Projects Close-up view showing the RTC, buzzer, Mercury FPGA module, LED driver transistors, and LED & tube series resistors. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413814596548-ZM7OHFMXHWKXOOSNH4QX/image-asset.jpeg Projects Successful output from the FPGA-based prototype https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1414122161942-A9PTRAQ2V953SEB0SM53/image-asset.png Projects Four overflows found in the auto-routed design. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413814101407-GLBKSMA6GBWRLYPFEK64/image-asset.png Projects Simulation of several lines of video, illustrating the behavior of the "active" signal, which indicates whether or not a line of video contains visible information, or is part of the blanking period (the time when the electron beam is sweeping back. If it is part of the blanking period, then the color output is grounded, as per the specification. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1414120680845-C9SV5WN3PCXIP2YFBW6K/1.png Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1414120680897-R2OHBDXLOQUEBHX70OGQ/2.png Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1414120681066-ZC9ZMM1JSNOKUOBAL90L/3.png Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1414122002106-FV123RVW6ZH41GFX3ONO/4.png Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1414120681145-TKTG705TXBEEKTUG4D23/5.png Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413744355009-PNUMR8S9W2BYZ2KFH4O5/image-asset.png Projects VGA controller block diagram https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1414119684468-78DXSJWUTUO0H0D49JLA/image-asset.png Projects Leonardo Timing Report https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1414121405755-L3HILRXTBHE6U3CCIY35/image-asset.png Projects Standard Cells Placed https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1414119414491-60TXNWEJG9JII7FF7MJJ/leonardo_compiled.png Projects Leonardo Compilation Report https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1414122810153-3B5BM119NAAJQOEEGSS3/image-asset.png Projects Standard Cells Routed https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1414122120426-0ZNZFC0Y3I1XDMBIKHA4/image-asset.png Projects No shorts found in the auto-routed design! https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1414122665324-QI8GRMG0SQZP77113P79/image-asset.png Projects Auto-routed design. DRC errors corrected manually. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413814406651-OQVCKTWRWLU97AXMMI4H/image-asset.jpeg Projects VGA ASIC prototype using a Mercury FPGA module https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413744651705-9143DXJ7CVYICKUKTESS/memory_controller_states.png Projects Memory Controller State Diagram https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413813481561-GD78FRXD5EA3OFAFCIEJ/vertical_timing.png Projects Simulation of VGA Frame Timing https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413813870384-TBCTIWNQXWX84KI5622Q/lines.png Projects Simulation of three horizontal lines. When the horizontal counter reaches the maximum value, the comparator "Hdone" output goes high; this resets the horizontal counter and increments the vertical counter. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413813467475-I78UPBNXI9Z1JTRFD7ZR/horizontal_timing.png Projects Simulation of VGA Line Timing https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413725810857-STLSDZE3FLUSD5YP0EW3/image-asset.jpeg Projects Layout of the VGA ASIC https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413744517316-PY12HVJQOD5NYFCF7SBY/image-asset.png Projects SPI controller state machine https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413742907382-65AMB2FIREW4FCUPEIK7/vga.png Projects VGA standard diagram (Source: Xilinx) VGA timing tables (Source: tinyvga.com) https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413814038950-2T4TSNVWB4MKL8UGK660/pulses.png Projects Simulation of the sync pulse width https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413744725129-HKI5970PBIK4TMLF57R8/image-asset.png Projects Simulation of the SPI write-to-VRAM operation. A SPI command has finished (rising edge of CSn). This is detected and raises the SPI flag register. The memory controller interleaves this write between reads. After the write is serviced, the SPI flag returns low. https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1457626082119-7HO58SCEXN4VRRS29DEW/1.png Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1457626084677-4T33H0V2QXK8QMIIH07F/6.png Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1457626086884-JXYVGLG7MH8S9ENZFG0Z/11.png Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1457626083445-GHKGIMGZ8LFR8DQV391P/4.png Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1457626082636-ASBUE8PAEWHKDK20TYM5/2.png Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1457626084506-BCMX137N8MTPPKWJ9A0L/5.png Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1457626086456-DWHNRZEWDDTA4EUKGYVJ/9.png Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1457626085850-K265A3X4AVWBXDBFSJIO/8.png Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1457626091646-ODQP2NZ3B1HH1DB4EXNT/15.png Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1457626085760-ECL9LC99B89GP63HSV8S/7.png Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1457626087718-67220CSE3C3I1DRD6ZY0/10.png Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1457626089382-0HOIG3H14UCMV8MU3R0K/13.png Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1457626088347-7EWH3ZZ7V5JKJOGM9SP1/12.png Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1457626084239-Z7K73JK0YK9PLLFKZHSP/3.png Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1457626090041-KPUCXN7NMIBYS07L6JBF/14.png Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1457634427388-VI8UHPHULNW6LYV5RNIA/16.png Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1457583432141-3A4HLTJ35NFI3OWS1GFB/image-asset.jpeg Projects Mercury ME1B-200M with baseboard, running the Mandelbrot explorer. PS/2 mouse, potentiometer and push-buttons are used for user input. VGA monitor is used for output (800x600 @ 72Hz) https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1457577986365-QO5ZNY8EITCXNE3YHP1H/image-asset.png Projects The Mandelbrot set, rendered on the Mercury FPGA dev board https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411249438357-BD5QNB109PF1ZXY9XQPR/teslacoil.jpg Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411256177111-BQCM9JP7RHGJFR0G10TB/slide3.jpg Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411256327834-KPLNRE8FAGXMVM0YLX7E/slide4.jpg Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411304577690-8HV0KC2USK9CTLSIJYPJ/fpga_mandelbrot_1.jpg Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1478646787201-0ADIBK16RTUVPD4V2NAB/6.jpg Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411435199456-BYW78U7CVWRJXX086BS9/tetris.jpg Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1411661996983-4IH0X89Q01R2X479FCID/IMG_0054.JPG Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412701547256-96S49QZLEU9SC8B59A46/IMG_0283.JPG Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412708787277-36E75LPYRZFNIZBI6WJI/psocvga.jpg Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1412717672933-W0A74DEK267QWDLH2YXD/IMG_0291.JPG Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1413725986999-HRY7KXQYP0ZSXMI0O9TK/layout.JPG Projects https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1457585728665-KNDPA30P50DVFQ0P48G2/mandelbrot3.png Projects https://www.markbowers.org/contact daily 0.75 2014-09-21 https://www.markbowers.org/resume daily 0.75 2023-04-15 https://www.markbowers.org/mandelbrot-slides daily 0.75 2021-12-14 https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1414165824366-WOJO3FPIQDWMT65KQVMI/PICT0001.jpg Mandelbrot Slides - M33 May 1991 https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1414165823747-QAAEZIZR1OEJPXGPA93Y/PICT0002.jpg Mandelbrot Slides - Untitled February 1991 https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1414165827759-O05B1GYWMHA7S15BRF9F/PICT0003.jpg Mandelbrot Slides - J51 September 1991 https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1414165828460-J4Z8M4HD9LUAG0RLJEVV/PICT0004.jpg Mandelbrot Slides - M58 April 1991 https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1414165831713-G8L0UF9R3U8AMEZSBKP7/PICT0005.jpg Mandelbrot Slides - Untitled September 1991 https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1414165831797-7RZPLS72NHBK8284R6EG/PICT0006.jpg Mandelbrot Slides - M2 February 1991 https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1414165835213-0CEOWJV3DKFGULIQ2S55/PICT0007.jpg Mandelbrot Slides - M33 May 1991 https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1414165837382-1JLWVDSH25WUDA705OX4/PICT0008.jpg Mandelbrot Slides - M32 July 1991 https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1414165838834-AFOE3J4YINHWQBBQCG2J/PICT0009.jpg Mandelbrot Slides - M33 May 1991 https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1414165844709-C2FUTM1JD7RUE9YYM2PN/PICT0010.jpg Mandelbrot Slides - J34 July 1991 https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1414165846982-Q7S70DOZR436UKJ941FI/PICT0012.jpg Mandelbrot Slides - M1 February 1991 https://images.squarespace-cdn.com/content/v1/541dd114e4b09b4760c19872/1414165849537-MCP1AV1MZF3OJQXR69TG/PICT0013.jpg Mandelbrot Slides - M58 April 1991 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