On 30 Mar 2004, at 14:34, Jeff Walther <[EMAIL PROTECTED]> wrote:
The good news is that there's probably a PC shop near you with an EEPROM programmer who can copy your ROMs to a few sets of EEPROMs for a modest price. Most non-volatile chips of a given size and organization have a pinout similar enough that they are compatible for reading. I hope this would fall under the allowable back-up copy of copyright law, but I'd advise not mentioning it to Apple.
So a 128K X 8 ROM in a 28 pin DIP has the same pinout as most 128K X 8 EPROMs and EEPROMs in a 28 pin DIP so far as reading the chips goes, which is all that goes on while it's in a Mac anyway.
Thanks for another informative post, Jeff. As far as programming *EPROMs goes, how easy depends where you live in the world. Last year or so, a work colleague mis-flashed an EEPROM in a PII motherboard. We checked the typical UK catalogues (Farnell, RS etc) but the only vendor who had a suitable package in stock was in Sweden and ordering would have cost more than a replacement motherboard. In the end, we peeled the labels off 100 or so surplus ethernet boot ROMs until we found a match... It should (usually) be easier for compact Mac and Apple II ROMs because the socketed ROMs are standard but many people have reported problems buying blanks at a reasonable price.
(For help on fixing old Macs, don't just look to the Mac community. If you are working on a basic circuit /psu or you have schematics, an old-style radio shop is a good place to visit.)
Phil
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