Re: wanted:info on IIe extension

[nathan@cco.caltech.edu (Nathan Mates)]

In article <35m4hf$bor@maxwell4.ee>, Dan P. Scholnik <dpscholn@mtu.edu> wrote:
>	Well, I found a cross assembler that lists the instruction set for
>the 6502, 65c02, and the 65c00/21 (whatever that is) . It claims that the
>65c02 has instructions BBR0 throught BBR7, and several other bit-test
>instructions. BBR is Branch on Bit Reset. I have not seen these anywhere else
>and so I wonder if this assembler just got mixed up as to what was from
>which processor......

   This is the Rockwell variant of the 65C02. It has all the operations
of the 'standard' 65C02 (stz, bra, lda/sta/and/etc (dp), tsb, trb and
a few others), then adds a bunch of bit operations & tests on the
zero page. These operations are only on the Rockwell 65C02; their
opcodes were used for various new instructions on the 65802/65816.

Nathan Mates



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