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First post, by Perro

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Hi. I have a Commodore 286-16 with 640kb of memory and I would like to expand it, but I don't know how to do it. The motherboard has 4 expansion slots and I have tried to put memory of various types in banks 1 and 2: 2x256, 2x512, 2x1m .. But the PC does not recognize them. Can anybody help me? By the way, how do you enter the bios? I only manage to enter by forcing an error, but I would like to know the key or key combinations to enter. Thank you.

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Reply 1 of 8, by Horun

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Early Pheonix bios. Try ctrl+alt+S. Most 286 you cannot run both DRAM and SIMMS unless there is a jumper to set the banks (they typically support 2 banks). Your DRAM is only one bank so maybe there is a jumper to allow using one set of SIMMS. Odd that the board does not have extra sockets and allow 1Mb of DRAM, most "Chips" boards do. Added: trying two at a time was a good idea, make sure they are true 9 chip simms 80Ns or faster (some bios do not like the 3 chip ones)

Hate posting a reply and have to edit it because it made no sense 😁 First computer was an IBM 3270 workstation with CGA monitor. 🤣

Reply 2 of 8, by Perro

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Good morning.

I have been doing tests, but I haven't obtained good results. I hope that with these photos, someone can help me.

I am still unable to enter bios with a key combination.

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Reply 3 of 8, by Jo22

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Horun wrote on 2020-04-04, 23:17:

Early Pheonix bios. Try ctrl+alt+S. Most 286 you cannot run both DRAM and SIMMS unless there is a jumper to set the banks (they typically support 2 banks). Your DRAM is only one bank so maybe there is a jumper to allow using one set of SIMMS. Odd that the board does not have extra sockets and allow 1Mb of DRAM, most "Chips" boards do. Added: trying two at a time was a good idea, make sure they are true 9 chip simms 80Ns or faster (some bios do not like the 3 chip ones)

Hm. I do have very little knowledge of DIL/DIP memory, I'm afraid, since most of my 286 PCs used proper SIMM/SIPP modules.
So I wonder: Would it help Perro to simply remove the DILs and use one or two pairs of 1MB SIMMs ?
From what I experienced in the past, most 286es can handle 4MB just fine.

Also, what about the ROM/Video shadow and "relocation" settings ?
Shouldn't they be turned off ? From what I remember "relocation" is the one with the missleading term.
With "relocation" enabled, memory is contingous (memory continues after 640KB); when disabled, it skips the 640KB-1MB area.

"Time, it seems, doesn't flow. For some it's fast, for some it's slow.
In what to one race is no time at all, another race can rise and fall..." - The Minstrel

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Reply 7 of 8, by pentiumspeed

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The setup says to hit F2 key.

Also please post pictures of memory modules that you could not use on this 286?

Cheers,

Great Northern aka Canada.