Reply 40 of 45, by creepingnet
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stanwebber wrote on 2022-04-23, 14:20:do you know what 486 chipset was used in these models? i'm trying to find a compatible upper memory block manager which are chipset dependent. i looked at the versa p service manual and there is no shortage of chip numbers, but i can't expressly identify a 486 chipset.
PT86C868 & PT86C718 looks like the northbridge/southbridge combo. is this correct?
I'm honestly not quite sure, but I don't think so. The two chips you refer to are the PicoPower chips which I believe handle the APM functions on these laptops. I think the M/75 has similar or the same chips on the board. That said there's a small chance they could be. I think those chips were only employed on the M/75, M/100, and P/75 which were the only models that used the OP-570-4701 smart batteries. The Ultralite/E/V all had smaller eight pin ICs in the region near the on-board 4MB on the underside of the CPU Board. Those could be the memory controllers. I might have to dig through or post up some photos of my motherboards in high resolution possibly.
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