What instructions would you like to see on a(n) 8-bit CPU?
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I'm making a virtual CPU of sorts and wondering what instructions I should add.

Code:

_____________________________________
/I like to play games and code, and I|
|recently got interested in |
|calculator programming. |
|____________________________________/


Yes 'add' should be one of your instructions! Very Happy

It depends on what kind of CPU you're planning for, something minimal or something with a very comprehensive instruction set?

Instructions that were always lacking on z80 are things like signed/unisgned mul/div which would be handy.
"My world is Black & White. But if I blink fast enough, I see it in Grayscale."

Add a useless pin that in all official documentation says "unused" but actually make it output the audio from Never Gonna Give You Up
tr1p1ea wrote:
Yes 'add' should be one of your instructions! Very Happy

It depends on what kind of CPU you're planning for, something minimal or something with a very comprehensive instruction set?

Instructions that were always lacking on z80 are things like signed/unisgned mul/div which would be handy.

already 'add'ed

i plan to add as much as you can fit in 8 bits

ok i'll add that

edit: i added an instruction that modifies the next instruction to be signed

Code:

_____________________________________
/I like to play games and code, and I|
|recently got interested in |
|calculator programming. |
|____________________________________/


idk the formal way to do this, but i'm just posting here to bring this topic up as i didn't get as much replies as i'd like

Code:

_____________________________________
/I like to play games and code, and I|
|recently got interested in |
|calculator programming. |
|____________________________________/


(again)

Code:

_____________________________________
/I like to play games and code, and I|
|recently got interested in |
|calculator programming. |
|____________________________________/


F8 for sdcc seems relevant, since they were looking at what makes a little CPU a nice target for C. Cheap stack-relative addressing seems like a key thing that's nice to have.
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