PC Chips 286 M216 Motherboard

Discussion about old PC hardware.

Re: PC Chips 286 M216 Motherboard

Postby Moogle! » 2018-2-01 @ 19:33

Interesting. I'll have to check mine out when I get it.
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Re: PC Chips 286 M216 Motherboard

Postby Fanatik » 2018-2-01 @ 19:35

Ok, everybody needs to check out this setup: viewtopic.php?f=46&t=46350
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Re: PC Chips 286 M216 Motherboard

Postby alvaro84 » 2018-2-01 @ 20:29

Moogle! wrote:For 20Mhz, you would need 50ns, which is rare as hens teeth and no one buying a 286 at that point was going to be buying something as expensive as 50ns ram.


So you say I shouldn't even care that my 286-20 works in 1WS mode and I don't know how to change this?
This way it's about as fast as a 16MHz 0WS one.
But I remember a board that could work in 0WS mode at 20MHz (but that one had issues with starting up, with GUS, and slow ISA video access). And I don't even have any 50ns RAM :confused:
Shame on us, doomed from the start
May God have mercy on our dirty little hearts
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Re: PC Chips 286 M216 Motherboard

Postby derSammler » 2018-2-01 @ 20:34

20 MHz works fine with 60ns RAM, because the CPU doesn't access RAM in every cycle and also you can access RAM always slightly faster than it is specified for. It may not be fully stable or the RAM may run hot, however, which is why you may add heatsinks to the RAM chips.
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Re: PC Chips 286 M216 Motherboard

Postby Fanatik » 2018-2-01 @ 20:52

I believe EKB's 286 ran 0 wait state with dram 20 pin chips and a simple aluminum cooler epoxied on top of them.
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Re: PC Chips 286 M216 Motherboard

Postby Moogle! » 2018-2-02 @ 00:23

I wonder if that is why my model has a 40Mhz crystal on it, instead of a 50Mhz one.
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