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Supporting hardware, expansions and projects for the rosco_m68k

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V9958 Missing Characters on Console

roscopeco opened this issue · comments

commented

The standard V9958 console in the firmware (reported with both 1.2 and 1.3) occasionally misses characters when printing. This has been reported both as a standalone problem and with other issues (e.g. inability to load software via Kermit of SD card).

A recent occurrence of this issue looked as follows:

image

My current working hypothesis is that we have a race condition somewhere in the console's PUTCHAR routine. However, I still cannot rule anything else, including possible hardware issues, out at this point.