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---
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title: Printed Circuit Boards
permalink: /docs/pcb
exerpt: "Printed Circuit Boards"
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---
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Although TommyPROM was originally designed as a one-off programmer to be used on a breadboard, there are now some PCB versions. The original TommyPROM PCB for 28C256 chips is described here, and the [TommyPROM32 PCB ](tommyprom32-pcb ), for handling a variety of chips, has its own page.
[](images/TommyPROM-pcb.jpg)[](images/TommyPROM32-SST39SF.jpg)
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## 28C256 PCB
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A PCB version for the 28C256 and 28C64 chips was built to support a SAP-1 TTL breadboard
computer. This project required a lot of burns for its microcode and the PCB version
with the ZIF socket was much quicker than prying the chips out of a breadboard without
disturbing any of the wires.
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The [KiCad design files ](https://github.com/TomNisbet/TommyPROM/tree/master/schematics )
are in the project repo.
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[](images/TommyPROM-pcb-with-microcode.jpg)
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[](images/TommyPROM-nano-sch.png)
