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    Memory Chips for an AST Rampage 286 Board (256KB DRAM)

    I'm looking for 256KB DRAM chips for my AST Rampage 286. The specifications listed in the user's manual are as follows: Pin 1 not used + 5 Volts only 100NS or faster The following list of chips are known to be compatible, but any compatible chip will do. Fujitsu MB81256-10P Hitachi...
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    Switch Setting for an IBM 512KB Memory Board

    Does anyone have documentation on the 16 dip switches for an IBM 512KB memory board? The current settings allocate all 512KB to Extended memory. I want to allocate 128KB to Base Memory and the remaining 384KB to Extended Memory. This arrangement will increase my AT 5170 Base Memory to 640KB...
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    Coprocessor for an IBM 5170 Type 1

    I'm looking for a coprocessor for my IBM 5170 Type 1. The installed CPU is an Intel CG 80286-6 C. I'm not sure what coprocessor I need. C80287-1 ? C80287-2 ? C80287-3 ? xxxxxx-6 ? D80287-10 ?
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    What Type of Coprocessor is needed for an IBM AT Type 1?

    I have an IBM AT Type 1 with a CG80286-6C CPU. Does anyone know what Coprocessor will work with this CPU? Thanks, Old PC Man
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    Need Help with a Hard Drive problem on an IBM 5170 Type 1

    My 5170 has a WD 1003-WA2 Windchester/Floppy Drive controller. The floppies are working fine but my Seagate ST225 HD is not. I know it is not the HD. I tested the HD in an old IBM PC and it worked fine. I've double checked the HD Drive Select setting and it's OK. I've changed out both ribbon...
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    Need help on an IBM 5170 CPU Orientation (How it plugs in)

    I'm trying to restore an old IBM 5170 AT Type 1. When I removed the motherboard to clean the interior, the CPU fell out if the socket. Apparenty the CPU was not inserted as it should have been. Unlike most motherboards, there is no chip orientation for the CPU. There are no pin numbers...
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