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| Found a NOS stash of ST62E28 ROM MCUs. How were they programmed? |
| (1/1) |
| Yansi:
Hello, I have found a NOS stash of ST62E28 ROM MCUs. Out of curiosity, does anyone have a documentation how these were programmed? I can google the name of the tool, heck I could even find one with the software to run it, but I am more interested how the programming interface was done on these old MCUs. I have a ST62E28CF1 (datasheet), which is a cerdip with UV erasable ROM inside. From the datasheet that can be easily found on google, I can clearly see there is a 12.5V Vpp pin. However I do not see any further description how is the data transfered inside. Have anybody used these 8bit oldtimers? Thanks :) |
| mikeselectricstuff:
A lot of these early EPROM MCUs had a programming interface identical to EPROMs, just needing a pinout adapter and a standard EPROM programmer. |
| amyk:
You are in luck, a year ago someone asked on here about how to program a different member of the ST62 series, and I found the programming spec: https://www.eevblog.com/forum/microcontrollers/need-to-programm-a-st62t10-mcu-help-finding-a-cheap-programmer/msg1620967/#msg1620967 |
| Yansi:
Nice one! Thanks for sharing. Have had a quick look, it didn't look much like any regular EPROM. |
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