FIx my board cartridge KD-s105

Started by horus, May 16, 2020, 07:34:39 am

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horus

May 16, 2020, 07:34:39 am Last Edit: May 16, 2020, 04:58:45 pm by horus
Hello Folks, you can help me to fix my cartridge.
You recognize these ICs eprom memory you could tell me if 27c256 or 27c512 ?
Regards

krzy

DIL32 = either 128 kB (27C010), 256 kB (27C020), 512 kB (27C040) or 1MB (27C801).
True size can be determined by analyzing the connections to upper address lines and checking which ones are not wired at all or wired to constant signals (GND/VCC)

horus

Ok but this eprom DIL32 on board are flashable ?

krzy

Who knows, maybe they put flashable memory under this blob, but even if they did, you won't have any idea what model is it so you won't know which programming algorithm to use (you could send CFI Query to it - write, and if it respond, you could find out the model). But you need to quess first which of the pins is /WE