24 Apr
1998
24 Apr
'98
2:03 a.m.
On Fri, 24 Apr 1998, Pete Turnbull wrote:
One other nice thing about the 6502 instruction set, the organization of
the instructions does make a lot of sense when you look at each opcode
bit-wise rather than in hex. So for instance, a certain addressing mode
always has certain bits on, and register specific opcodes (such as INX,
INY) always have certain bits on, etc. I haven't looked at it in a while
but I remember when I did it all made sense.
Sam Alternate e-mail: dastar(a)siconic.com
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Of all the
micros in my collection, none are RISC save for the PDP-8 and
6502 which in my mind come close.
The 6502 has a certain elegance of instruction set. Quite a different
philosophy to the Z80, in many ways, but I like them both. We used to say
that you had to learn how to use the 6502, and when you did, the code was
neat, but on a Z80, you just had to decide what you wanted an instruction
to do, and then pick the one that did that. Exaggeration, of course.