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Although I like to stay true to my 68K roots, I recently acquired a PB 540c with the Apple 603e 100MHz upgrade card. So decided to take this up to OS 8.6, because why not? :)

For those with LC475/Q605-type Macs (ROM checksum FF 74 39 EE), a working SIMM slot, a SIMM programmer, and an available 8MB SIMM..... I would appreciate feedback on the attached ROM. Firstly, thanks goes to @JDW @Jockelill and @WillJac for doing some initial testing and providing feedback. An...

Playing around in ROM code again, and I noticed a difference in behavior with System 7 and OS 8. Starting with Mac OS 8, the operating system no longer issued control code 22 to my ROM disk driver. (22 = get icon) I found Apple's Tech Note 1102, which has a very interesting mention about this...

Long weekend here in the States, with July 4. In between hiking, BBQ, and family time.... Spent quality time with some of my Macs. On my MacPlus, decided to run some wiring from the internal BlueSCSI to outside the case. Now no more constantly opening it up to get to the SD card. Hurrah! Also...

I decided to play around with the Rominator v1 I installed in my MacPlus. When I dump out the ROM, the first bits are: BBBB BBBB. When running the Flash Tool v1.6 to update the boot chime, I get the following error: Error: Flash ID 3737, 8686 did not match any known device ID Looking at the c...

Does anyone know how to force a NMI inside Classic Mac (say 7.1) running inside Basilisk? Basically I want to break into MacsBug to disassemble some ROM code, and using Basilisk I can do this against a number of different ROMs. I am running Basilisk in Windows if it makes any difference. I...

I purchased a nicely restored C610 motherboard from Will at the CayMac team. I am going to work on some overclocks and ROM hacks. So now this means I am in the market for a C610 case :) In search of, if anyone has any leads!

Wanted to show my MARCHintosh project. Here are the mods- 1) Board and PSU recapped (by last owner) 2) Modified board to run at 33MHz (by last owner) 3) Full 68040 40MHz, coveted 02L88M, with added heat sync 4) BlueSCSI v2 with Mac OS 8.1 of course 5) 1MB 70ns VRAM 6) 128MB 50ns RAM 7) CayMac...

I know there have been posts similar to this. But I've worked with some tools such as FDisasm. I can't seem to really get a reliable or full disassembly of the LC475 ROM. I would like to get to this point, so I can dabble with ROM programming using some SIMMs I purchased from CayMac. Can...