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https://github.com/TomNisbet/TommyPROM.git
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36 lines
1.3 KiB
Markdown
36 lines
1.3 KiB
Markdown
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---
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title: PCB
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description: "TommyPROM Arduino 28C256 programmer PCB"
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has_children: false
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nav_order: 35
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---
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# Printed Circuit Board
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Although it was originally designed as a one-off programmer to be used on a breadboard,
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there are now some PCB versions.
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## 28C256 PCB
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I built a PCB version for the 28C256 and 28C64 chips because so many burns of these were
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needed for a SAP-1 TTL breadboard computer. The PCB version with the ZIF socket was much
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easier to work with, compared to prying the chips out of a breadboard without disturbing
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any of the wires.
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The [KiCad design files](https://github.com/TomNisbet/TommyPROM/tree/master/schematics)
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are in the project repo.
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[](images/TommyPROM-pcb.jpg)
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## TommyPROM-32
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A new PCB is in progress for 32-pin EEPROM and Flash chips. This design uses a set of
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headers that allow any of the signals to the target chip to be re-routed. The default
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configuration, with just jumper shunts installed, is wired for the SST39SF0x0 chips.
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Many other chips, particularly if they follow JEDEC standards, can be supported be adding
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just a few jumpers.
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Chips with few pins can also be supported. There are power pins in place to support
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28-pin and 24-pin chips with a shunt to the correct VCC pin.
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