Re: Do it yourself upgrade: IIgs ROM 01?

[oaaland@aol.com (O Aaland)]

David Empson writes:

>Dietmar Krueger <dkrueger@oec.uni-osnabrueck.de> wrote:

>> Lately I have got an Apple IIgs ROM 0 Machine. I want to upgrade it to ROM
>> 01. So I downloaded the ROM 01 files but I cant burn a 128kByte EPROM (only
>> smaller 32kByte EPROMS). 

>Even if you could burn a 128KB EPROM, it won't physically fit in the
>motherboard (you would need an adaptor plug to get the signals into the
>right locations).  128KB EPROMs are 32 pins, while the IIgs ROMs are 28
>pins.

>This is probably easier than rigging up a circuit to use four 32KB
>EPROMs, but the easiest option is to simply buy the ROM from Alltech
>Electroncs, assuming that they can still supply them.

>-- 
>David Empson

My EPROM burner lists an Intel EPROM that is 1MB in a 128 pin 
configuration. Without looking it up I believe the number was 
27C010. They also list another that is 1MB in a 32 pin configuration. 
The number of that one is, I believe, 27C011. Would the 28 pin EPROM 
work as a IIGS ROM 01 chip?

Owen