dougg3 wrote:I got both the header and the socket for some 0.05" pitch connectors:
dougg3 wrote:We'd probably want some way to release one row of the headers to make it easy to get the SIMM in, and then tighten the two headers' "grip" on the contacts.
tt wrote:You might be able to get away with having a static setup without moving parts. Can the two rows of pins contact the sides of the SIMM without the black plastic supports getting in the way?
tt wrote:One thing that would also be useful is to have something like soldered header sockets a couple pins wide acting as lateral locators on both sides. That way you wouldn't accidentally connect the wrong pins by the SIMM sliding over. The design should probably be compatible with using a SIMM socket in case a supply was discovered in the future.
Trash80toHP_Mini wrote:Sounds like it's time to add some jumper selects/wire wrap headers between the SIMM contacts in question and the alternate Chip pins/select lines. It can be as simple and tiny as more plated thru-hole vias and a piece of wire as a permanent solution after we do a round of testing with the new layout.
Have you got an unpopulated board left for testing? Plug it into your IIci (assuming it has MoBo ROMs) to see if the ROM SIMM might be addressable as memory expansion when booting from MoBo ROMs? Having some of those signals tied together, to VCC or GND, even on an empty card, might cause some problems/open up some options . . .
. . . dunno . . . just spit-ballin' agin'!
dougg3 wrote:Do you have a continuity tester? It would be very interesting to see if pins 1, 13, 46, and 63 are connected together on the ROM SIMM socket on the IIsi motherboard. That would help confirm or deny my suspicions...
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