collapseos/blk/208
Virgil Dupras a9ed8da0b2 acia: simplify driver
The previous approach of maintaining R> and W> pointers was
conceptually simple, but made INT handler code actually quite
complex.

Now, we maintain indexes instead. It's much easier to perform
bounds checks and to compare for equality, something we have to
do quick in the INT handler.
2020-08-14 22:58:05 -04:00

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Plaintext

Instructions list
r => A B C D E H L (HL)
d => BC DE HL AF/SP
c => CNZ CZ CNC CC CPO CPE CP CM
LD [rr, ri, di, (i)HL, HL(i), d(i), (i)d, rIXY, IXYr,
(DE)A, A(DE), (i)A, A(i)]
ADD [r, i, HLd, IXd, IXIX, IYd, IYIY]
ADC [r, HLd]
CP [r, i, (IXY+)]
SBC [r, HLd]
SUB [r, i]
PUSH POP
INC [r, d, (IXY+)] DEC [r, d, (IXY+)]
AND [r, i] OR [r, i] XOR [r, i] (cont.)