Computer breakout
About the Computer breakout
Computer breakout is an open source PCB design by hprd, published on GitHub. It is a 2-layer board measuring 90.8 × 64.5 mm, with 22 components from 8 distinct parts.
Other key parts include the MC14489BDWE and CC56-12CGKWA. By type, the board carries 10 ICs, 7 resistors, 3 capacitors and 2 connectors.
It belongs with the retro computing and dev boards & breakouts designs in this gallery.
From the project
UT Austin Fall 2025-Spring 2026 Senior Design Project for developing a Zilog Z80 CPU drop-in replacement using an FPGA.
Relevant links and information from previous group's iteration: - Instruction Set - Z80 User Manual - Master Reference Website - Timing Quirks
Main components on the Computer breakout
Computer breakout bill of materials (BOM)
22 components, 8 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 5 | MC14489BDWE | SOIC127P1030X265-20N | IC1, IC2, IC3, IC4, IC5 |
| 5 | CC56-12CGKWA | CA56-12CGKWA | U1, U2, U3, U4, U5 |
| 1 | USB_C_Receptacle_PowerOnly_6P | USB_C_Receptacle_GCT_USB4110 | J1 |
| 1 | Conn_01x06_Pin | PinHeader_1x06_P2.54mm_Vertical | J2 |
| 2 | 10u | C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C1, C2 |
| 1 | 100n | C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C3 |
| 2 | 5k1 | R_1812_4532Metric_Pad1.30x3.40mm_HandSolder | R1, R2 |
| 5 | 1.5k | R_1812_4532Metric_Pad1.30x3.40mm_HandSolder | R3, R4, R5, R6, R7 |
Computer breakout design files
The KiCad project lives in the hprd/z80-fpga-drop-in-replacement repository on GitHub; these links point at the commit this page was built from.
Computer breakout: common questions
How big is the Computer breakout?
The Computer breakout measures 90.8 × 64.5 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Computer breakout?
22 components, from 8 distinct parts. The full bill of materials is listed on this page.
Where can I download the Computer breakout design files?
From the hprd/z80-fpga-drop-in-replacement repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Computer breakout design in my own project?
The repository has no license, so all rights stay with hprd. Use it as a reference, and ask the author before reusing the design.
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