hi guys,
im messing around with a broken iic (us version) which i got here in germany...
It wont post / shows marbled graphics. It tries to read from my floppy emu but ends with errors...
i managed to check system with rom4x
(most of the time the machine gets stuck while testing maybe in 1/100 i got different Ram Errors...)
PICTURES:
https://bilderupload.org/bild/a01a45189-96120971-1021911182579946
https://bilderupload.org/bild/55c545181-96428022-1021911182615947
https://bilderupload.org/bild/e1d545163-130223672-102207176541441
is this because of faulty ram? i am able to swap these but im not an pro with osci and so on... is there a chance to fix this or might there be more involved like broken IWM ?
Rgds Dario
Does this happen with both the original ROM and with the rom4x? I assume you're not able to get into BASIC?
The screen that says "RAM 00001011" - is that the result of the RAM test telling you which chip is bad?
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Yah - this is the result, but results are different every time (most of the time no result at all)
i probed the the ram with an osci today and all databits and refresh look the same.. so i assume its not the ram
If you can boot to BASIC, load the Monitor with CALL -151
Flood the ram with different values, one bank at a time, then read it back. See if you can find a specific bank that is mirrored or stuck.