WD1771 Board
About the WD1771 Board
WD1771 Board is an open source PCB design by roberto314, published on GitHub under the BSD-2-Clause license. It is a 2-layer board measuring 100 × 100 mm, with 78 components from 26 distinct parts.
Other key parts include the 74HCT7540, 74HCT7541, WD1770, XC9572VQ44 and 74AHC1G08. By type, the board carries 29 resistors, 14 diodes, 14 capacitors, 11 ICs, 7 connectors and 1 crystal.
It belongs with the retro computing and usb & debug tools designs in this gallery.
From the project
A modular 8-bit Computer able to recreate (nearly) every Retro computer of the late 70s to mid 80s.
A modular 8-bit Computer able to recreate (nearly) every microcomputer of the mid 70s to early 80s in Hardware without FPGAs (although an FPGA can be added). Can also be used as a teaching tool for:
VHDL or Verilog C RTOS (STM32F401 runs ChibiOS. Link: https://www.chibios.org) Python bash and linux in general (Olimex board runs linux with fbterm and tmux) Harwaredesign Timing of CPUs maybe Assembler SPI and I2C Interfaces CPLDs and FPGAs
Main components on the WD1771 Board
WD1771 Board bill of materials (BOM)
78 components, 26 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 74HCT7540 | SO-20_5.3x12.6mm_P1.27mm | U1 |
| 1 | 74HCT7541 | SO-20_5.3x12.6mm_P1.27mm | U2 |
| 1 | WD1770 | DIP-28_W15.24mm_Socket | U3 |
| 1 | XC9572VQ44 | TQFP-44_10x10mm_P0.8mm | U4 |
| 1 | 74AHC1G08 | SOT-23-5_HandSoldering | U5 |
| 1 | 74ACT139 | SOIC-16_3.9x9.9mm_P1.27mm | U6 |
| 1 | WD2791 | DIP-40_W15.24mm | U7 |
| 1 | 74LS245 | SOIC-20W_7.5x12.8mm_P1.27mm | U8 |
| 1 | SN74LVCC4245ANSR | SO-24_5.3x15mm_P1.27mm | U9 |
| 1 | 74HCT7541 | SO-20_12.8x7.5mm_P1.27mm | U10 |
| 1 | 74HCT7540 | SO-20_12.8x7.5mm_P1.27mm | U11 |
| 1 | 8M | Oscillator_DIP-8 | X1 |
| 2 | BUS | PinSocket_2x20_P2.54mm_Vertical | J1, J2 |
| 1 | Conn_01x14 | PinSocket_1x14_P2.54mm_Vertical | J11 |
| 1 | Floppy | PinHeader_2x17_P2.54mm_Horizontal | J12 |
| 1 | JTAG | PinHeader_2x05_P2.54mm_Horizontal | J14 |
| 1 | Conn_01x02 | PinSocket_1x02_P2.54mm_Vertical | J26 |
| 1 | EXT | PinHeader_2x05_P2.54mm_Horizontal | J32 |
| 2 | 10k | Potentiometer_Vishay_T73XW_Horizontal | RV1, RV2 |
| 1 | 1N4148 | D_1206_3216Metric_Pad1.42x1.75mm_HandSolder | D1 |
Show 6 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 13 | RED | LED_1206_3216Metric_Pad1.42x1.75mm_HandSolder | D2, D3, D4, D5, D6, D7, D8, D9 +5 |
| 12 | 100n | C_1206_3216Metric | C1, C2, C3, C4, C5, C6, C7, C11 +4 |
| 1 | 220n | C_1206_3216Metric | C8 |
| 1 | 8-70p | Capacitor_Trim | C9 |
| 27 | 1k | R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R1, R2, R3, R6, R7, R8, R9, R10 +19 |
| 2 | 10k | R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R4, R5 |
WD1771 Board design files
The KiCad project lives in the roberto314/Unicomp3 repository on GitHub; these links point at the commit this page was built from.
WD1771 Board: common questions
How big is the WD1771 Board?
The WD1771 Board measures 100 × 100 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the WD1771 Board?
78 components, from 26 distinct parts. The full bill of materials is listed on this page.
Where can I download the WD1771 Board design files?
From the roberto314/Unicomp3 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the WD1771 Board design in my own project?
Yes, under the terms of its BSD-2-Clause license, which roberto314 chose for the repository.
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