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Toni Wilen · 02 December 2017, 18:33

Yeah, flags are probably used by the internal algorithm.

I just quickly tested DIVS with 68020 and 68030, both seems to work identically but undefined bits are not static (like on 68000).

For example:

$0F000/1 = ZV
$0F0F0/1 = NV
$1F0F0/1 = V

I think this is impossible to reverse without knowing internal algorithm.

EDIT: 68040/060 seems to always only set V.

02 December 2017, 18:33	#9
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,502	Yeah, flags are probably used by the internal algorithm. I just quickly tested DIVS with 68020 and 68030, both seems to work identically but undefined bits are not static (like on 68000). For example: $0F000/1 = ZV $0F0F0/1 = NV $1F0F0/1 = V I think this is impossible to reverse without knowing internal algorithm. EDIT: 68040/060 seems to always only set V. Last edited by Toni Wilen; 02 December 2017 at 19:45.