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Thread: IBM PC AT 286 to 486DX-2 or DX-4 Upgrade

  1. Default IBM PC AT 286 to 486DX-2 or DX-4 Upgrade

    I have an IBM PC AT 5170 with a 6Mhz 80286. I saw somewhere that someone had upgraded an AT with a 486DX-4. Is there a card or socket upgrade of some sort that I could get to do so? If anyone has one Id be glad to buy it.

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    Pull the motherboard and put in a 486 AT board and you'll be good to go. There is no drop in upgrade that I am aware of. There were some drop in 386 board/cpus that were made to fit in the AT case, but you'd still be replacing most of the innards.

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    Thomas Byers (DRI)- "You'll have a million people using the A> [MS-DOS prompt] forever. You'll have five million using [nongraphic] menu systems such as Topview, Concurrent PC-DOS, Desq, and those types. But there'll be 50 to 100 million using the iconic-based interfaces."

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    Quote Originally Posted by lutiana View Post
    Pull the motherboard and put in a 486 AT board and you'll be good to go. There is no drop in upgrade that I am aware of. There were some drop in 386 board/cpus that were made to fit in the AT case, but you'd still be replacing most of the innards.
    Extend-It Technologies made a "Make It 486" Processor Upgrade for 286's. I had one. They also bade a 16-bit ISA Memory Expansion card that would fit 16 megs across 4 SIMM's. Great pieces of technology, too bad I didn't keep them.
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    Quote Originally Posted by lutiana View Post
    Pull the motherboard and put in a 486 AT board and you'll be good to go. There is no drop in upgrade that I am aware of. There were some drop in 386 board/cpus that were made to fit in the AT case, but you'd still be replacing most of the innards.
    Link to a motherboard that will fit in a 5170? All of them are ATX or for PS/1 systems.

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    Quote Originally Posted by jacobtohahn View Post
    Link to a motherboard that will fit in a 5170? All of them are ATX or for PS/1 systems.

    Just look for an AT 486 board on Ebay, most of them should fit in that case fine. I mean, that board is the originator of the AT standard

    IBM 5160 - 360k, 1.44Mb Floppies, NEC V20, 8087-3, 45MB MFM Hard Drive, Vega 7 Graphics, IBM 5154 Monitor running MS-DOS 5.00
    IBM PCJr Model 48360 640kb RAM, NEC V20,, jrIDE Side Cart, 360kb Floppy drives running MS-DOS 5.00
    Evergreen Am5x86-133 64Mb Ram, 8gb HDD, SB16 in a modified ATX case running IBM PC-DOS 7.10

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    Quote Originally Posted by lutiana View Post
    Just look for an AT 486 board on Ebay, most of them should fit in that case fine. I mean, that board is the originator of the AT standard
    Ok, great.
    Trying to determine if this would work in the AT chassis:
    https://rover.ebay.com/rover/0/0/0?m...2F182114419296
    And advice?

  8. #8

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    Yes it will fit.
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    I think the important thing to note is that if you decide to retain the original 5170 planar and "upgrade" it with an add-in 80486 card, it's entirely possible that (a) performance will be lower than a comparable 486 planar and (b) it will suffer compatibility issues.

    Just my .02.

  10. Default

    Quote Originally Posted by Chuck(G) View Post
    I think the important thing to note is that if you decide to retain the original 5170 planar and "upgrade" it with an add-in 80486 card, it's entirely possible that (a) performance will be lower than a comparable 486 planar and (b) it will suffer compatibility issues.

    Just my .02.
    I’ve heard the same thing. Planning on replacing the board.

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