68000 Emulation

buggs · 29 May 2016, 13:35

I've got some suggestions toward 68000 emulation in current FS-UAE builds.

I initially attempted to get 68k emulation to run fast (like a 50 MHz 68000 or so) but the current code does always select "REAL" speed. How about switching to max speed when "accuracy==-2" ?

My reason to set uae to pure 68000 mode was to investigate some crashes with my old programs I experienced on a real Amiga 500 in Kickstart 3.1 (my old A500 had 2.04 where that particular code path was not executed). In this process I found out that the emulation does not raise exceptions for some opcodes. One example was "tst.l Ax" which is not yet available with the 68000.

29 May 2016, 13:35	#1
buggs Registered User Join Date: May 2016 Location: Rostock/Germany Posts: 132	68000 Emulation I've got some suggestions toward 68000 emulation in current FS-UAE builds. I initially attempted to get 68k emulation to run fast (like a 50 MHz 68000 or so) but the current code does always select "REAL" speed. How about switching to max speed when "accuracy==-2" ? My reason to set uae to pure 68000 mode was to investigate some crashes with my old programs I experienced on a real Amiga 500 in Kickstart 3.1 (my old A500 had 2.04 where that particular code path was not executed). In this process I found out that the emulation does not raise exceptions for some opcodes. One example was "tst.l Ax" which is not yet available with the 68000.

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