Bill Garber wrote:
"David Wilson" <david@uow.edu.au> wrote in message news:40d4ca0d$1@news.uow.edu.au... : David Wilson <david@uow.edu.au> writes: : >Apple IIgs : >ROM00/01/03 1 megabit ??? none 28 : : >The IIgs uses a 28 pin 1 MegaBit (128KB) ROM but the : >equivalent EPROM has 32 pins... : : I just double checked the ROM03 schematics, my memory data book : and my ROM03 PCB. : : 1) The PCB is laid out for 32 pin sockets (but my IIgs : has only got 28 pin sockets soldered to it). Mine also.
I have some of each and one with a 28 pin ROM in one socket and a 32 pin EPROM in the other. I have only one IIgs with a 32 pin ROM handy without having to spend half an hour or more digging. It uses a M5M27C100K-15. Interestingly it's in a machined pin socket. Makes me feel like digging out some others to see which sockets they used on them. A neat project might be to update the tools on the ROMs to the System 6 ones. That'd let you boot System 6 off a leaner System folder and a bit faster. Of course that'd only be of real value for someone without a hard drive. Course you'd also need to modify your TS3 file or come up with a TS4 one. Wayne