jsmoo VS WinUAE

If you really want to use it, I have a bad 65816 assembler at https://github.com/raddad772/jsmoo/blob/main/component/cpu/wdc65816/wdc65816_assembler.js . Just don’t switch it to 65816 mode and it should produce compatible code. I wrote it as a pile of hacks on top of each other and you still need to add an iNES header.

If you want to really verify your CPU, check out https://github.com/raddad772/jsmoo/tree/b3807b55f03cdad2191810b2a770781d73c41870/misc/tests/GeneratedTests/sm83 , a set of 1000 tests per opcode, cycle by cycle, including read and write bus activity, in JSON format. It’s a bit of work to integrate them but there’s no better CPU test. Also you can generate more if you want to by using the code generation portion of the codebase. The only thing it doesn’t really test well is IRQ/halt stuff. It’s pretty common for folks to pass Blargg and still have things uncovered here. Usually things Blargg can’t test, or symmetric errors (flag both set and tested wrong), or corner cases Blargg didn’t think of.

https://github.com/raddad772/jsmoo/tree/main/misc/tests/GeneratedTests/z80 will troubleshoot any issues you have with instructions.

Where? If you want to check out other vanilla JavaScript emulators, https://github.com/raddad772/jsmoo

Thanks for the suggestions. I did see someone write about a battery leaking in a different blog post on a restoration, but I didn't know the battery leak was so common. I'm going to look at it (and remove) now. If the battery has already leaked and damaged the motherboard then I'll likely try using UAE to mount the drive on a PC via SCSI. I'm not familiar with UAE -- I see a github repo for UAE at https://github.com/bernds/UAE and also these sites https://www.winuae.net/ and https://fs-uae.net/ .. would I be able to mount the HD using winuae? Or would you recommend linux with fs-uae, or some other flavor of UAE entirely?

WinUAE

Have you submitted an issue on their GitHub?

If any one else is interested WinUAE is an emulator, you can also run Amiga on some older mac's.

There absolutely is. WinUAE is the best emulator for Amiga out there. You will need to provide the emulator with an Amiga BIOS and OS (not linking to that for legal reasons, you'll have to hunt those down yourself) but once you get everything set up, it works great!

For 68k there's also the cputester written by Toni Willen of WinUAE fame, which is extremely elaborate. For cycle accuracy testing you either need (pretty good) amiga custom chip support or modify the test program. FWIW he's working on an IPL accuracy tester, but the timing of some instructions are still being worked on.