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Thread: 1000EX ISA RAM Expansion

  1. #1

    Default 1000EX ISA RAM Expansion

    Is there any issue with ISA RAM cards in the 1000EX? For memory below 640K I mean.

    Many thanks!

  2. #2
    Join Date
    Feb 2017
    Chilliwack, BC, Canada


    Are you talking physical dimensions, or just logic level compatibility? I was attempting to build your 1MB ISA board into a PLUS format perfboard to figure out the latter myself, but got sidetracked with other stuff. It would only need half the components (only needs to be a 384K board), because the EX/HX come with 256K onboard and are meant to expand up to 640K. They might be able to go past 640k to 1MB, which is the maximum the 8088 can address, but I don't know if the BIOS can recognize it.

    The main issue with any expansion for the EX/HX is just making everything fit, combined with the Tandy RAM/DMA card also having the expansion headers for additional expansion cards. The space restrictions are even more tight for ISA cards with adapters.
    My vintage systems: Tandy 1000 HX, Tandy 1000 RSX, Tandy 1100FD, Tandy 64K CoCo 2, Commodore VIC-20, and some random Pentium in a Hewitt Rand chassis...

    Some people keep a classic car in their garage. Some people keep vintage computers. The latter hobby is cheaper, usually takes less space, and is less likely to lead to a fatal accident.


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