Hi, someone sent me a 8250LP for repair, and I'm somewhat confused with this device. This device is equipped with Speeddos ROM replacements (seemingly having 2k instead of 1k Controller ROM, on a special RIOT adaptor board that also puts the CPU onto the adaptor), but that shouldn't matter. Before I fixed that adaptor board, the drive reported five blink codes (Controller failure, 6502 or 6530), and now it reports just one blink code (zeropage, 6532 failure). But both 6532 are good, as well as both CPUs. The ROMs also should be good, I put in known good ROMs but the blink code remains. So which other components can cause this blink code? I'd also like to know if it is true that the drive processes blink codes from the end, because it reverts to five blink codes as soon as I remove the controller CPU or RIOT. This would mean that there's only this one problem left. I'm pretty clueless now, I'd start trying to replace the LS157 multiplexers, and maybe some stuff like LS04 and LS42 that addresses the RIOTs. Once the drive is working again, I'm very interested what effect that Speeddos has. (Yes, I'm going to upload it then). Maybe a PET Speeddos is also needed, but I'm pretty sure I also got the ROM dumps of that somewhere. Now I only need a PET to install them :-) Thanks, Nicolas - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail email@example.com.
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