David Empson wrote:
Roger Johnstone <roger@roger.geek.nz.removethisbit> wrote:In <1homysl.1akj9zoco0cx2N%dempson@actrix.gen.nz> David Empson wrote:kaos116 <kaos116@comcast.net> wrote:Yes there is a memory expanision header inside. from what I have read and remember. All of the ][c's had it except the very first revisions. I think you could get up to 1 meg inside.The memory expansion slot was added in the third generation of the IIc, but the second generation (with UniDisk 3.5 support) had basically the same logic board as the first generation (differed only in default ROM size and serial port clocking). The expansion slot is functionally equivalent to a RamWorks card in a IIe: it has a single byte bank address which allows auxiliary memoryto be switched between up to 256 banks of 64KB, so the theoretical limit is 16 MB, but the hardware interface might not provide all ofthe bits of the higher address bus.David, I think your books have been stashed away for too long. The original third-party memory cards for the IIc used bank switched memory,but Apple's memory card had a slinky interface just like the Apple II Memory Expansion Card used in the Apple II models with regular Apple Bus slots.Oops, you're right. Sorry about that folks. I was getting confused with the Applied Engineering product which plugged into the MMU socket. Maybe I should think about getting rid of my books and stop posting here if I'm starting to forget important details.
Please don't. ;-) I'm in awe of the level of detail that you routinely remember! -michael NadaNet networking for Apple II computers! Home page: http://members.aol.com/MJMahon/ "The wastebasket is our most important design tool--and it's seriously underused."