Re: ROM 00 to ROM 01 upgrade

[david@uow.edu.au (David Wilson)]

a_specto@alcor.concordia.ca (Mitchell Spector) writes:
>    Apparently there were _some_ ROM 00 chips produced without
>stickers, just a plain silk-screened part number (or perhaps if you
>remove the sticker there's a part number underneath?).

On the cover of one of my //gs books is a photograph of what
must be a prototype //gs motherboard - it has a 27512 EPROM instead
of a 1Mb ROM. I suspect that this is why A16 is inverted on the ROM
socket - so the prototyping could be done with an EPROM. This would
have to have predated work on the toolbox which is in the other 64KB
of the ROM.
--
David Wilson  School of IT & CS, Uni of Wollongong, Australia