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04 January 2020, 16:01
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#1 |
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WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 49
Posts: 26,518
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68010/68020 RTE from bus/address error
Does anyone remember if there was any program(s) that required 68010 or 68020 (without MMU), took over address error exception vector, did some processing in exception handler (for example if 68010: emulating odd word/long access in software) and then continuing instruction execution with RTE.
I am currently adding some previously missing 68010 specific features to UAE (for example 68010 loop mode is now emulated and address error stack frame contents are correct) and basically last missing feature is ability to retry/continue bus and address errors using RTE which 68000 can't do. I guess this feature, at least with 68020, would have been used more if Amiga had generated bus errors when accessing non-existing RAM/IO space... |
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