First post, by hasat
Hello, I am out of ideas, what could be wrong with this board. Only one memory bank (bank 0) working. These are slots 1-4. Memory in slots 5-8 are not detected. Used 8 identical 1 MB modules with three chips on it, tried randomly changing their position in slots and nothing - still detected only 4 MB of RAM.
Board is DTK PEM-4036YB
Here are results of memory slots probing:
DATA0-7 connected to an identical slot in second bank
CAS connected together in one bank
CASP connected together in one bank
RAS connected together in one bank
ADR0-11 each line connected to each slot. ADR11 not connected
WE connected to an identical slot in second bank
DP connected to an identical slot in second bank
QP connected to an identical slot in second bank
My opinion is that something is wrong with CAS and RAS signals, because their are independent for each bank. Their are connected from chipset (SL82C461 chip) through 74F244 buffer (20 pin SMD chips between memory slot and BIOS chip) to slots.
Or maybe bank 1 is somewhat disabled in BIOS. I tried program AMISETUP and not found any hidden options in BIOS related to this.
I replaced Dallas chip with dead battery, board now remembering it's setting, but nothing changed.
Thanks for any tips how to resolve this problem!