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[Cass]

I have a spare 2.05 ROM after upgrading my A600 to 3.1 , so during the x-mass vacations I thought that it would be cool to upgrade my 1.3 A500+, left at home.

What I did was to replace the 1.3 with the 2.05 but the computer wouldn't start (like there was no ROM to it). A friend of mine said that it might be a software problem : the 2.05 ROM checks for the IDE that isn't present on the A500, so it won't boot.

Anybody there that has tried this kind of upgrade? I hope that my 2.05 ROM is still alive after this experiment (I haven't test it yet back to the A600)!

P.S. The A500+ had the 2.04 originally, but since then I've chainged lots of ROM couples (1.3/2.04), and now I'm left with an old 1.3 only.
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[Jope]

Hmm, it shouldn't be a problem.. The scsi.device checks for the IDE and just isn't initialised if it can't find any IDE hardware.

What revision A500? Are you sure you plugged the ROM in correctly?

[Cass]

It's a revision 8, and the ROM socket has an extra pair of pins that should be skiped (the top ones, I've learned it the hard way: that's why I had to change many pair of roms).
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[pjhutch]

The 2.05 ROM is 512K big and 1.3 is 256M so you need to make a mod to recognise the larger ROM.
See this for instructions:

http://www.pcguru.plus.com/kickstart/kickinstall.html

[Cass]

As a matter of fact the A500+ came with a 512KB ROM (2.04), and the 1.3 just replaced it with no further modifications/troubles.

The point is that the next version (2.05 from the A600) seems not to be alive on the same motherboard that hosted long ago a 2.04
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[Cass]

I just tried the 2.05 back to the A600 and works fine (thankfully is still alive!).

-The A500+ has a 68010 as a CPU, a 1.3 ROM, 1.5MB chip and the rest is left as a stock A500+.

-The A600 has a 68030@40 & 68882, 16MB fast, 2MB chip, and 3.1 ROM

I think it has to do with the special reallocation tables that missing (used by softkickers), after doing a plain substitution of the chip to another motherboard.
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[Tomas]

I did the same thing with my standard a500, swapped the 2.x rom from my a600 into a500 and put 1.3 rom into my a600 :-D worked sweet on both machines.. :-D

[Tomas]

The 2.05 ROM is 512K big and 1.3 is 256M so you need to make a mod to recognise the larger ROM.
See this for instructions:

is 2.04 256k only? I am not sure if i used 2.04 or 2.05, but it worked fine without any mods at all..

[Desmon]

Both ROMs should be interchangeable. The big difference between 2.04 and 2.05 was the IDE support. The 2.04 ROM had none. The 2.05 ROM was for the A600.