Re: [fuse-emulator-devel] Emulation of SCF

[Philip K. <pa...@sr...>]

On Tue, Feb 17, 2004 at 09:25:29AM +0100, Erik Kunze wrote:
> 
> I'm currently running the Z80 test suite from Spectaculator (results from
> a real Spectrum 48K) againt some Z80 core emulations. One of the mostly failed
> operations is SCF. The FAQ seems to be wrong in that point (amongst others).
> 
> FAQ
> 	bit 3 and 5 copied from A
> 
> FUSE
> 	bit 3 and 5 are ORed with A
> 
> XZX-Pro
> 	bit 3 and 5 are unaffected
> 
> To pass the Z80 test suite one needs to emulate the XZX-Pro behavior.
> 
> Any comments?

Ian Greenway has tested this on a real Spectrum and found that bits 3
and 5 are copied from A as the FAQ suggests. (This is also what Sean
Young's document says, but this probably isn't entirely independent of
what the FAQ says).

A bug in Spectaculator's test suite? (although Fuse is also wrong :-( )

Cheers,

Phil

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