Retro computer enthusiasts: you might find this CPU opcode app useful.

[rairii@labyrinth.zone]

@GrantMeStrength slight error in the screenshots: the cpu in the game boy is not a z80, it's a Sharp SM83, the instruction set is different

[grantmestrength@hachyderm.io]

@RandyMongenel noted!

[grantmestrength@hachyderm.io]

@Rairii fix coming! Thanks.

[randymongenel@bitbang.social]

@GrantMeStrength You could say the SM83 was inspired by the Z80 and 6502. It has a zero-page like area at the top of memory, accessible with shorter opcodes. No shadow registers or index registers. I/O is very different. Added a nybble swap opcode. But yeah, most Z80 coders would be both comfortable and frustrated by it.

[steckschwein_6502@mastodon.social]

@GrantMeStrength Only runs on iOS 26 as it seems

[weirdocollector@livellosegreto.it]

@GrantMeStrength Android please

[honuk@mastodon.social]

@GrantMeStrength would like to run and test it on iOS 18 but seems to require newer iOS, so can‘t.

[semiprime@mastodon.online]

@weirdocollector @GrantMeStrength If it's the Z80 that you're interested in, there's a Z80 opcode reference app for Android by @bitsofbas here: https://mstdn.social/@bitsofbas/116142091114704126

[lopta@mastodon.social]

@GrantMeStrength I miss my old paper Z80 programmer's manual. Did my first machine code with that, pencil & paper and a Sinclair Spectrum.

[weirdocollector@livellosegreto.it]

@semiprime @GrantMeStrength @bitsofbas Thanks! I also do some 6502 and less frequently 6809, and it would be really great to have your app also on Android. Thanks again!

[grantmestrength@hachyderm.io]

@honuk try again!

[grantmestrength@hachyderm.io]

@steckschwein_6502 updated it. Please try again.

[grantmestrength@hachyderm.io]

@lopta you don’t have this on a shelf?

[lopta@mastodon.social]

@GrantMeStrength I've definitely seen that but I don't own a copy.

[klaso@mastodon.social]

@GrantMeStrength Thank you!