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Thanks, @zigzagjoe has provided to me the necessary datasheets, so I can have a better overview how the functions are related to each other. I assume that the ROM also defines which video modes are available based on the state of the mode pins of the video connector, correct? (much like a...

Hi everyone, that's what I sort of expected after doing some initial research. I mean, coming originally from the C64, I'm not that unfamiliar in getting "my hands dirty" in delving into low-level bootstrap code, which sort of has an underlying structure, but was never documented or defined in...

Hello Mac community, I joined MLA68K 2 days ago, because I recently acquired a Macintosh LC475, which I have started to like a lot due to its compact size, and actually very good performance. Most people know me in the Amiga community, where I have started several hardware designs ranging from...

Well, then let's make it a real project now. :-) I start a new thread.

Something like this: Supports 68040 / 68060 CPU (selectable via jumper) 128 MB SDRAM, up to 100MHz (either 1x or 2x bus clock) CPU clock up to 100MHz (060), 50MHz (040) Bus clock to mainboard can be 1/2 or 1/4 2MB flash rom for early boot code / patching of MAC OS rom "RECOVERY" jumper, if...

I have looked at it, and there seems to be code which is related to adjusting the stackframe handler for 68060, and also FPU related code. Otherwise, yes, the incompatibilities on instruction set level should be handled by the FPSP/IPSP code from Motorola, which on Amiga, is part of a specific...

Btw, if you ask me, disabling access to the on-board RAM and, instead, implementing the SDRAM controller directly on the add-on board could be a much more easy and faster way. Does every Mac locate its Ram at the same base? Or is it fragmented in a way to provide "24-bit" addressing support?

Hi, firstly, congratulations on getting the 68060 running on a native Macintosh. I'm coming from the "other"side (Amiga), but recently acquired an LC475 which I am currently getting familiar with. One hint regarding the patching of the Mac Roms to get them fully working with the 68060: have...