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Yeah CayMac is good to use, as you found. I used the identical gestalt 59 timings, yeah, just spun a ROM hack myself. I did tweak the ROM speed to minimum wait states (25MHz config) since that works fine with modern flash ROM SIMMs, as noted above. The heat sink I have is the one that comes...

If you have a flashable ROM and a socket, the best option if you want to change it is flashing a ROM with 40MHz timings for the Q800. No weirdness with the gestalt ID and fully reversible without getting out the soldering iron again. That's my 2 cents anyway. They do seem to run alright at...

You probably bought the same 80MHz part I did to try to repair my broken upgrade card. PPCA601FF-080c-2? It looks pretty legit to me, but I haven't tried mine yet. It's much harder to fake these because the glass/epoxy(?) packaging would show any damage from grinding off the label and printing a...

I've tried to compile links to all the Motorola data here: https://eharmon.net/retro/macintosh/motorola-processors/

Yes, newer firmware can use flux images, if you store in MOOF.

Stranger still support seems to be entirely self-contained within the app. It finds the card and loads a DRVR for it.

Thanks! Just a date code before the 001 then. That indicates it's the parallel version. I'll pull some info into the other thread, but here's the B-rev datasheet: https://www.renesas.com/en/document/dst/1562b-datasheet?srsltid=AfmBOop4fRWL3BeAPUZ7ONOKFfxSAQnSwKVGSBT90tUDrgEEKe-Ti17S Seems like...

Can you read the part number off the U226 below the cap? ICS1562AM? Also curious to know what's before the -001, if you can see it.

Extending this (still incomplete) list from way back: Spectrum 24 Series III SMT-01, BSR-02 Spectrum 24 PDQ SMT-01, BSR-02 Spectrum 24 PDQ+ SMT-02, BSR-03, SQD-01 Spectrum 24 Thunder 24 SMT-02, BSR-03, SQD-01 Spectrum 24 Series IV SMT-02S, BSR-03, SQD-01 Spectrum 24 Series V SMT-02S...

Some observations: Generally the 1600 has reduced horizontal blanking at all resolutions. The first section of the unknown BSR data is different in each timing set. This difference is the same for all timings. 1360: 50020600 1600: 31020600 The unknown SMT02 data is slightly different in each...

Oh wow, that's an incredible deal! Seconded! Awesome! Hopefully will find some time to spelunk through it this week.

Sadly they just seem to be so much rarer.

It’ll go for more than I want to pay, but a 1600 is up for sale if anyone wants one (bonus points for ripping the ROM). https://www.ebay.com/itm/276813400902?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=5ounctrjQ8O&sssrc=4429486&ssuid=5aurdf_ytjq&var=&widget_ver=artemis&media=COPY

Some future 020+ core implementer for FPGA will hopefully stumble upon this thread.

I finally added these instructions.

If you click the functions list below it’ll point to the entry and approximate length for each driver call in the file listing based on the offsets. Don’t depend on the length though, it’s just a guess based on most ROMs putting that code sequentially. In reality from that entry point it could...

I wonder if HRC are just binned better? That’s the same 61um mask.

Could be related to the Extended DeclROM? EDIT: Actually I don't think PowerPCs ever used that so unlikely.

Oh it actually patches the ROM? I assumed the CPU support library would bridge it but I guess that makes sense. It's largely passing control of the processor directly to the Mac so there's no place to interpose the missing instructions. I know I'm just rehashing the great 060-for-mac debate...

Heh this thread kicked off a lot of discussion... Ooh neat! Guess that shows an 060 really could compete with the first generation PowerPC. That's dang quick! I imagine a 100MHz 601 starts to really pull ahead though. That's a sweet 4000 setup! I can't handle the blistering $3k that'd cost...