From: Brian Ketterling (tweel8502_at_hotmail.com)
Date: 2003-11-08 01:59:33
>From: "Daniele Gratteri" <firstname.lastname@example.org> > > > 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 _________________________________________________________________ MSN Shopping upgraded for the holidays! Snappier product search... http://shopping.msn.com Message was sent through the cbm-hackers mailing list
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