Using flashable Macintosh ROM SIMM

Al Kossow aek at
Tue Apr 26 19:15:48 CDT 2016

I assume you'd have to locate a 32-bit clean rom image from one of the emulator sites, then break out every 1/4 byte
into a file. You then have to use an external prom programmer to write them. According to the eBay ad:

"Chips are socketed for individual flashing on a standard eprom programmer with PLCC32 adapter."

On 4/26/16 3:44 PM, David Griffith wrote:
> I have a "MACSIMM" from GGLabs ( which I bought from their Ebay store.  Unfortunately they haven't
> followed up on my request for information on how to prepare a ROM image for use with the thing.  Has anyone else here
> used this or a similar device to hack the ROMs of the Mac SE/30, IIsi, IIci, or IIfx?  It's composed of four 39SF010A
> 32-pin PLCC chips the special 64-pin SIMM.

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