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Old 12 September 2012, 21:49   #1
Mrs Beanbag
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Coldfire V4 emulation

How's this for a bizarre, off-the-wall, experimental suggestion? Add Coldfire to emulated CPU list, see if we can get anything to run on it. AROS m68k ROM could be recompiled easily enough, MOST 68k instructions are binary compatible, the ones they dropped being "infrequently used". So maybe some applications will work without modification, to a greater or lesser degree. It would be interesting to see how far you could get.
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Old 12 September 2012, 22:56   #2
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Yes, if it is possible this could be great test for real accelerator hardware. But after my investigation it is not possible to get it 100% compatible. Maybe for start should be nice to have it in UAE so we can figure out what's missing.
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Old 12 September 2012, 23:08   #3
Mrs Beanbag
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main instructions missing: BCD instructions (who ever used them anyway?), binary rotations (not entirely uncommon), dbcc (quite common), and binary arithmetic in other than longword sizes (probably fairly common on Amiga).

Nothing you couldn't easily do without if you were writing new code but... it would be interesting for research purposes at least, and as a programmer I'd like to play with it.
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Old 13 September 2012, 19:17   #4
Toni Wilen
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I don't think it is as simple as disabling some instructions and addressing modes.
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Old 10 April 2014, 07:55   #5
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A few years back I checked out the Coldfire embedded CPU's (I think it was the 68340 at the time) for use as an accelerator, but declined due to memory map interference due to the onboard peripherals.

The newer Coldfires seem to be no better; they would require glue logic (not unexpected), and (the dealbreaker) not all interrupt levels are externally supported.
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