New op-codes

[42bs]

Not sure where I got it from, but found it by accident again on my HD and thought I'd share it. The attached file contains a bunch of macros that add some "new" opcodes.

One has to setup a table of 0..255 called `idtable` somewhere in memory (best on a page boundary) and then use the macros.

 

Examples:

txy ; move x to y

There are several ways to achieve this:

phx
ply

or (by destroying A)

txa
tay	

or (by use of some memory)
stx nn
ldy nn


or (that's the new opcode)

ldy	idtable,x

 

newop.mac

Edited April 2 by 42bs

[Irgendwer]

On 4/2/2023 at 12:32 PM, 42bs said:

Not sure where I got it from

Maybe here:

https://www.nesdev.org/wiki/Identity_table