Program Challenge (was Re: z80 timing... 6502 timing)

From: Hans Franke <Hans.Franke_at_mch20.sbs.de>
Date: Tue Apr 20 15:08:43 1999

> > > MOV CL, 4
> > > SHL AX, 4
> > > RET

> > Why not SHL AX,4?

> Because the 8088 didn't HAVE a shift immediate instruction. Check with
> Allison about which processor introduced it, and when it cam out. Was 286
> <= 1983?

Sorry if I'm not Alison :), but it has been the 186/188 (in my opinion
the most beautiful member of the x86 family) which first used a barrel
shifter and first allowed immidiate multiple shifts. Correct me if my
memory is corroded.

Gruss
H.

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Received on Tue Apr 20 1999 - 15:08:43 BST

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