From: Brian Ketterling (tweel8502_at_hotmail.com)
Date: 2003-11-08 01:59:33
>From: "Daniele Gratteri" <daniele_gratteri@inwind.it>
>
> > The same thing also happened at Intel: some 8088 engineers left to start
> > Zilog so they could pursue their own better idea, the Z-80.
>
>I think the Intel CPU you are actually referring to is the 8080: in fact,
>the Z80 is instruction compatible with that CPU.
I think you're right.
As far as "BRK" on the 6800, I found the SWI (software interrupt)
instruction via Google, and also kind of a spif website:
www.textfiles.com/programming/CARDS/
with instruction-set "reference cards" for many microprocessors. The 6800's
instructions look like a superset of the 6502's.
Steve Judd said he recalled having Sirius (my assembler of choice nowadays,
btw -- thanks, Steve!) assemble BRK as two bytes, and I see in the 65C816
data sheet that the second byte is regarded as a "signature byte" -- but
isn't used for anything?!
-- Brian
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