Replies to various threads

From: Sam Ismail <>
Date: Fri Apr 24 01:03:54 1998

On Fri, 24 Apr 1998, Pete Turnbull wrote:

> > 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.

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:
Don't blame me...I voted for Satan.

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Received on Fri Apr 24 1998 - 01:03:54 BST

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