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Thread: CMOS staic RAM board

  1. #1

    Default CMOS staic RAM board

    I have a RAM board with 64K of 6116s. It has not manufacture label. The switches are labeled. There are some for extended addressing above A15, These I understand. It has another set of switches labeled:

    E000
    E800
    F000
    F800
    EXT ADR
    HALF PHANT
    PHANT

    I assume EXT ADR enables extended addressing. I would think that the E000 thru F800 disable the RAM for areas with typical ROM.
    I would guess PHANT is to observe the PHANTOM pin.
    What would HALF PHANT be?
    Dwight

  2. #2

    Default

    Never mind. I found the board. It seems to be a Digital Research 64K board. I found a manual for it. It seems the HALF PHANT only looks at the Phantom pin when the address is below 32K. I'm not sure why one would want that but that is what it does.
    Dwight

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