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Tom Nisbet 3eb78e359c Add PCB page to prep for new board
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PCB TommyPROM Arduino 28C256 programmer PCB false 35

Printed Circuit Board

Although it was originally designed as a one-off programmer to be used on a breadboard, there are now some PCB versions.

28C256 PCB

I built a PCB version for the 28C256 and 28C64 chips because so many burns of these were needed for a SAP-1 TTL breadboard computer. The PCB version with the ZIF socket was much easier to work with, compared to prying the chips out of a breadboard without disturbing any of the wires.

The KiCad design files are in the project repo.

TommyPROM PCB

TommyPROM-32

A new PCB is in progress for 32-pin EEPROM and Flash chips. This design uses a set of headers that allow any of the signals to the target chip to be re-routed. The default configuration, with just jumper shunts installed, is wired for the SST39SF0x0 chips.

Many other chips, particularly if they follow JEDEC standards, can be supported be adding just a few jumpers.

Chips with few pins can also be supported. There are power pins in place to support 28-pin and 24-pin chips with a shunt to the correct VCC pin.