Hi all,
I´m new here a have two main problems:
First, I know very little only about vintage computers and second - I know even less about english, please accept my apology. Yet I hope, someone can understand me...
So, what I need:
I have socket 3 mainboard (I think, this is Shuttle HOT-419 like this https://stason.org/TULARC/pc/motherboards/S/S … 19-VER-153.html, but for 5V CPUs only (w/o VRM). She come to me with 4x1MB 30pin sticks and 1x4MB 72pin stick populated in slots. I want added some RAM and buy 2x16MB FPM sticks, 60ns, 8 chips every, single sided. But here started mystery:
If I pull out 4x1MB sticks (aka bank 0) from 30pin slots and insert 2x 16MB into 72pin slots, POST see 8MB RAM only (banks 0/1 and 2/3 are populated).
OK, maybe one slot wont work ,I think, and another see one half RAM size for high density chips ?- so I pull out one 72pin stick from bank 2/3 and reboot. Same result - 8MB RAM are visible.
OK, then I insert back 4x1MB 30pin into bank 0, reseat 1x16MB stick from bank 0/1 into bank 2/3 and reboot. Now, 12MB RAM is presented (but mismatched and slowing down PC , of course).
So, this way I know, that every slot for RAM is working, but why mainboard cannot see 2x8MB from two 72pin sticks? Can it be due to old BIOS? Or what can make this issue?
Thanks for Your advance and knowledge.