Reply 40 of 62, by RayeR
Thanks for effort, thankfully my vision is still sharp enough to see this pins w/o mag. lens 😀
Now we have important OE and CAS signals that are grouped by 2 chips for 64b data bus width, but I'm missing the RAS. I belive it should have 2 separate pins as CAS has. You probably missed it but try also J4-D30 and J4-D29 that are RAS of onboard chips.
I wonder a bit about J4 A23 that is connected with B30 on the card but not on module, maybe used on 12MB version.
Also I need to figure data bus mapping so please check at least J4-A12 (DQ0) and J4-C3(DQ0) which goes to what chips (pin 5 on mem.chip)
and similar for J4-D21,C21,A21,D20 (BE0-3) and J4-B23,C22,B22,A22 (BE0-3) which goes to what chips (pins 119, 98, 120, 97 on mem. chip)
Also not clear about SQ0-15 lines that each onboard chip have them separate but I guess it would be also separately connected to 4 mem chips. on module, so please check at least J2-C25(SQ0), J2-C19(SQ0), J2-D13(SQ0), J2-D4(SQ0) which goes to what chips (pin 32 on mem. chip). This pins seems to have 33ohm resistors in series so be sure your DMM beeps at this resistance yet.
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