First post, by p6889k
A friend gave me an old 486 board with a CPU upgrade in its 2nd socket and I need help determining what model of CPU it is as I would like to try it in another functioning 486 board of mine. Unfortunately the motherboard is oxidized and doesn't work anymore so I can't turn it on and see what it posts. The CPU itself has a heatsink on the top with no labels. I removed the CPU to see what's at the bottom, but google search didn't return anything. The motherboard has an oscillator in its OSC1 socket with 60 MHz chip, don't know what to tell from that. Half of it would be 30 MHz, but I'm not aware of any 486 cpu with that bus speed. Unless the previous owner installed wrong oscillator. I can't tell much else from the motherboard. The model is MB-1420/25/33V. Googling it didn't reveal anything and none of the jumpers have any information that would tell me how the board is setup.
I guess the last resort would be to remove the heatsink. How do I remove it safely? How do I ensure it doesn't remove any of the CPU model markings underneath the heatsink? How would I reattach the heatsink? Would normal modern cpu thermal paste work, even if there's nothing pressing the heatsink against the cpu?
Attached are pictures of the board and the cpu. Thank you.
Attachments
Sinclair ZX Spectrum 48k, 48k+, 128k, +2
Amiga 1200, 68030/40mhz
386DX/33, ET4000, SBPro2, MT32
Dual PPro/200, Millennium II, Voodoo 2, AWE32, SC-55
etc.
