Z80VDP1B
About the Z80VDP1B PCB
Z80VDP1B is an open source PCB design by lynchaj, published on GitHub. It is a 2-layer board measuring 100 × 100 mm, with 93 components from 44 distinct parts.
Other key parts include the 74LS244, 74LS245, 74LS688, CXA1645 and 74LS02. By type, the board carries 37 capacitors, 25 resistors, 13 ICs, 5 connectors, 4 jumpers and 4 diodes.
It belongs with the retro computing designs in this gallery.
From the project
Modular Backplane Computer
Z80 VPD1B is a board for V9938/V9958 using CXA1645 for video output stage
The following patches are needed (per Dan's build. Mine are similar but slightly different): - HSYNC (pin 5, U12) needs to be low, not floating I tied it to pin U12,Pin 1 with a jumper - SCIN (U5) needs the CLK signal, and this is disabled when JP1 is off (which it typically must be off in order to not conflict with the system clock Wink -- I clipped pin 12 on the bus connector and installed JP1 - R, G, and B need 470 ohm pull downs to ground from pins 22,23 & 24 on the VDP (U3) - jumper VRESET/VDS (U12, pin 4) to +5…
Main components on the Z80VDP1B
Z80VDP1B bill of materials (BOM)
93 components, 44 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | 74LS244 | DIP-20_W7.62mm | U1, U3 |
| 1 | 74LS245 | DIP-20_W7.62mm | U2 |
| 1 | 74LS688 | DIP-20_W7.62mm | U4 |
| 1 | CXA1645 | DIP-24_W10.16mm | U5 |
| 1 | 74LS02 | DIP-14_W7.62mm | U6 |
| 1 | 74LS32 | DIP-14_W7.62mm | U7 |
| 1 | 74LS06 | DIP-14_W7.62mm | U8 |
| 1 | 74LS174 | DIP-16_W7.62mm | U10 |
| 4 | D41464C | DIP-18_W7.62mm | U13, U14, U15, U16 |
| 1 | 2N3906 | TO-92_HandSolder | Q1 |
| 1 | 21.47727 MHz | Crystal_HC49-4H_Vertical | X1 |
| 1 | INT#/NMI# | PinHeader_1x03_P2.54mm_Horizontal | J2 |
| 1 | RGB TTL | PinHeader_2x06_P2.54mm_Horizontal | P1 |
| 1 | SPARES | PinHeader_2x05_P2.54mm_Vertical | P2 |
| 1 | Z80 BUS BACKPLANE | PinHeader_2x25_P2.54mm_Horizontal | P3 |
| 1 | RAMDAC | PinHeader_2x08_P2.54mm_Vertical | P4 |
| 1 | BUSCLK | PinHeader_1x02_P2.54mm_Vertical | JP1 |
| 1 | V9958 | PinHeader_1x02_P2.54mm_Vertical | JP2 |
| 1 | OPTWAIT | PinHeader_1x02_P2.54mm_Vertical | JP3 |
| 1 | V9938/V9958 | PinHeader_1x03_P2.54mm_Vertical | JP4 |
Show 24 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 10K | R_Array_SIP9 | RR1 |
| 1 | IO PORT ADDR | SW_DIP_SPSTx08_Slide_9.78x22.5mm_W7.62mm_P2.54mm | SW1 |
| 4 | LED | LED_D3.0mm | D1, D2, D3, D4 |
| 1 | 68u | L_Axial_L6.6mm_D2.7mm_P10.16mm_Horizontal_Vishay_IM-2 | L1 |
| 16 | 0.1u | C_Disc_D5.0mm_W2.5mm_P5.00mm | C1, C2, C3, C4, C5, C6, C7, C8 +8 |
| 3 | 10u | CP_Radial_D5.0mm_P2.50mm | C10, C11, C29 |
| 4 | 0.22u | C_Disc_D5.0mm_W2.5mm_P5.00mm | C12, C13, C14, C15 |
| 3 | 330p | C_Disc_D5.0mm_W2.5mm_P5.00mm | C16, C17, C18 |
| 2 | 33p | C_Disc_D5.0mm_W2.5mm_P5.00mm | C22, C23 |
| 1 | 47p | C_Disc_D5.0mm_W2.5mm_P5.00mm | C25 |
| 1 | 4.7p | C_Disc_D5.0mm_W2.5mm_P5.00mm | C26 |
| 1 | 27p | C_Disc_D5.0mm_W2.5mm_P5.00mm | C28 |
| 6 | 220u | CP_Radial_D6.3mm_P2.50mm | C31, C32, C34, C35, C36, C37 |
| 4 | 470 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2, R5, R10 |
| 3 | 1K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3, R4, R23 |
| 2 | 0 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R6, R16 |
| 4 | 4700 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R7, R15, R17, R24 |
| 1 | 2.2K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R8 |
| 1 | 20K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R9 |
| 6 | 75 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R11, R12, R13, R14, R18, R19 |
| 1 | 47K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R20 |
| 1 | 10K | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R21 |
| 1 | 180 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R22 |
| 1 | 120 | R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R25 |
Z80VDP1B design files
The KiCad project lives in the lynchaj/nhyodyne repository on GitHub; these links point at the commit this page was built from.
Z80VDP1B: common questions
How big is the Z80VDP1B PCB?
The Z80VDP1B measures 100 × 100 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Z80VDP1B?
93 components, from 44 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Z80VDP1B design files?
From the lynchaj/nhyodyne repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the Z80VDP1B design in my own project?
The repository has no license, so all rights stay with lynchaj. Use it as a reference, and ask the author before reusing the design.
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