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Thank you! This explanation is really helpful.

I vote to keep the 540c, Duo 280, IIfx, PM8500, SE/30

Did you ever get to 50MHz?

According to a PDF entitled 'Apple ROM Matrix', there is a listing for a ROM with checksum 852CFBDF for 'PowerBook 5300 and Assistive Technology Freestyle'

FYI I've now uploaded this ROM to Macintosh Garden.

Thank you – this has indeed worked great. The exact commands I used are: To Split srec_cat 1996-10_83A21950_PowerBook_1400_1400cs.bin -binary -byte-swap 2 -split 4 0 2 -o High_srec.bin -binary srec_cat 1996-10_83A21950_PowerBook_1400_1400cs.bin -binary -byte-swap 2 -split 4 2 2 -o...

If they're not available then I'll dump mine (I don't have a complete 5300, but I do have a logic board).

Not really as I don't have access to a PC at the moment. And I'd rather figure out the problem than avoid it, since I'm told srec is the best tool to use (although not the easiest to get the hang of).

I'd like to get the hang of joining and splitting Macintosh ROMs and have been recommended srecord by the forum regulars, but I'm having some trouble with interleaving. I have installed srecord 1.65 on my Mac via Homebrew. As an experiment I'm trying to combine the High and Low ROMs that I...

Really? So does an LC475 tighten RAM timings when the Q605 jumper is set?

What do you think, @joevt ? Could a late 1400 Series ROM boot a 5300 Series or Duo 2300c?

LOL

My first thought is whether you’d be able to close the powerbook with the ram expansion socket installed, but I guess it just takes up the space where the modem normally resides. I don’t think any software or firmware would need to be adjusted, since the Rage Pro does support up to 8MB. I have...

This is pretty cool, I’d put my money on it working.

Isn’t the AEKII the exact width of a Mac II… and the AEK a shade wider?

Check UH7 again as that is notoriously difficult to fit on a Reloaded board.

Yes :) It’s not that you can’t set the correct multiplier on the logic board; you can but the real issue is that you’ll get no boot. For whatever reason, support for multipliers above 4x needs to be enabled in firmware. If you knew what you were doing you could try to disassemble the old and...

Here we go. I/O is 3.3V tolerant, just PLL and Core supply needs to be 2.5V. I guess you could do it by bending those 14 legs (13x Vdd, 1x AVdd) back and wiring them up through a level shifter.

No, that’s the key issue. You’d need to incorporate a 2.5V level shifter somehow for VCC. You’d also have to see if 603ev is 3.3V tolerant on the I/O, if it’s not then that’s a total deal breaker. If it’s just the power input legs then yeah you could do a messy hack!

Well you could clock the bus up to 40MHz for 160MHz operation and it would probably work if you can find a QFP 603e (not ev) faster than 120MHz - there might be some 133MHz chips floating about but I doubt more than that. People have clocked the PB1400 to 40MHz successfully so I’m very...