BrettHallen/MSX_VDP_TesterSimple Arduino sketch & PCB to test if a V9958 is real.
MSX VDP Tester Arduino is an open-source printed circuit board by BrettHallen, from the BrettHallen/MSX_VDP_Tester repository on GitHub. It is a 2-layer board of 84 × 64 mm with 22 parts on 94 nets, routed with 214 tracks and 0 vias.
It is built around the HDSP-7803. Its parts include 9 resistors, 5 capacitors, 3 connectors, 2 ICs and 1 switch. It belongs with the retro computing and games boards of this library.
Simple Arduino sketch & PCB to test if a V9958 is real.
Idea is to query the "identification number" of the chip from bits 1-5 of status register S#1:
| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 470Ω | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2, R3, R4, R5, R6, R7, R8, R9 |
| 3 | 100nF | Capacitor_THT:C_Disc_D3.8mm_W2.6mm_P2.50mm | C1, C2, C3 |
| 2 | 33pF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C4, C5 |
| 1 | +5V In | Connector_BarrelJack:BarrelJack_Horizontal | J2 |
| 1 | 10KΩ | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | 21.47MHz | Crystal:Crystal_HC49-U_Vertical | Y1 |
| 1 | 74LS595 | Package_DIP:DIP-16_W7.62mm | U1 |
| 1 | Arduino Nano | Module:Arduino_Nano | A1 |
| 1 | HDSP-7803 | Display_7Segment:HDSP-7801 | U2 |
| 1 | Power Passthrough | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J3 |
| 1 | Test | Button_Switch_THT:SW_PUSH_6mm | SW1 |
| 1 | VDP Under Test | Clueless_Engineer:DIPS1905W50P178L5730H420Q64N | J1 |
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It measures 84 × 64 mm and has 2 copper layers, 1.6 mm thick.
22 parts, built around the HDSP-7803. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
From the BrettHallen/MSX_VDP_Tester repository on GitHub, at the commit this page was made from: the board is MSX_VDP_Tester_Arduino/MSX_VDP_Tester_Arduino.kicad_pcb and its schematic MSX_VDP_Tester_Arduino/MSX_VDP_Tester_Arduino.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask BrettHallen before reusing the design.
