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

[grantmestrength@hachyderm.io]

Retro computer enthusiasts: you might find this CPU opcode app useful. Please let me know of errors and omissions!

On TestFlight for iOS now. Requires iOS 18.

Join the Opcodes beta

Using TestFlight is a great way to help developers test beta versions of their apps.

(testflight.apple.com)

Z80, 6502, 6800, 6809, 8080, 1802, 2650 and 8088.

[randymongenel@bitbang.social]

@GrantMeStrength Error: the Z80 was not used in the Nintendo Gameboy. It uses a mostly similar CPU from Sharp that we call the SM83. Opcodes are not quite the same, missing hardware, adds stuff.

[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!