Clean 32bit ROM for Classic II

[MegaImg]

I just restored a Classic II (Disassemble, clean everything, service floppy drive, recap main board, analog board and co-processor expansion board, replace fan, SCSI2SD 5.1 and retrobright) with the co-processor board, 10mb of RAM but looking for a clean 32bit ROM I can burn and add to the expansion board. Can anyone help!

 

[Fizzbinn]

Looks great! Fairly certain the Classic II shipped with 32-bit clean ROM and you can address its max of 10MB RAM (with two 4MB SIMMs installed) in either 24 or 32 bit addressing mode. Do you already have a FPU expansion card? I’ve never seen one I don’t think. 

 

[MegaImg]

Looks great! Fairly certain the Classic II shipped with 32-bit clean ROM and you can address its max of 10MB RAM (with two 4MB SIMMs installed) in either 24 or 32 bit addressing mode. Do you already have a FPU expansion card? I’ve never seen one I don’t think. 

Yes I have the FPU Expansion Card, you can see it installed on the open picture...that why I am asking...I already have the max memory, but for me the FPU card ROM area is there to be able to put a ROM that fix the 32bit dirty ROM.

 

[Fizzbinn]

Ah, looking closer I think I see it in towards the bottom right of your second to last photo, neat!

Perhaps I’m incorrect but again I don’t think the Classic II has dirty ROM that needs to be fixed. The ROM upgrade slot is likely for “future” upgrades, I don’t believe Apple ever released any. I’m not sure if there are any Classic II compatible ”ROMinator” type hobbyist ROM upgrades available that might add a ROM based System image for instance. 

 

[superjer2000]

I agree with Fizzbinn.  There might be some confusion that the memory being recognized is due to a non 32 bit clean ROM when in fact it’s because Apple cut corners and artificially put a memory ceiling onto the Classic II.

 

[MrFahrenheit]

The ROM slots were integrated in most Macs and some had it eliminated after production ramped up and the boards and ROMs proved stable. 
 

the Classic II features an FPU upgrade slot and a ROM slot however the ROMs are indeed 32-bit clean. Every Mac after 1990 was 32 bit clean. 

 

[MegaImg]

The ROM slots were integrated in most Macs and some had it eliminated after production ramped up and the boards and ROMs proved stable. 
 

the Classic II features an FPU upgrade slot and a ROM slot however the ROMs are indeed 32-bit clean. Every Mac after 1990 was 32 bit clean. 

Thanks everyone for the clarification!