>> unused_zp = $02
>> stx unused_zp
>> ldy unused_zp
> Let me see if I understand this. I have 2 registers on the same chip.
> Presumably a chip with data paths between at least some of the registers.
> But to transfer data from one of them to another of them, I have to write
> it out to external memeory, and then use a second instruction to load it
> back in. And they're 2 byte instructions, right.
> So that's at least 6 memory cycles (2 to fetch the opcodes, 2 to fetch
:
> Heck, I've spent much of my life admiring designs where there are fast
> data paths between just about every section, and even designing machines
> like that. And where said data paths are in use whenever possible (look
> at the PDP11/45 CPU schematics and microcode flows for a good, simple,
> example of what I mean). And you expect me to like the above...
You clipped the part where I said ;-), Tony :-P
--
----------------------------- personal page: http://www.armory.com/~spectre/ --
Cameron Kaiser, Point Loma Nazarene University * ckaiser_at_stockholm.ptloma.edu
-- If your happiness depends on anyone else, you've got a problem. -- R. Bach -
Received on Sun Aug 19 2001 - 16:29:30 BST