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2463Patches to Run Altair BASIC on Z-80

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  • toml_12953
    Jun 10, 2011
      Does anyone here remember the patches necessary to run the various versions of Altair BASIC (4K, 8K and Extended - ver 4.0 and later) on a Z-80? They involve the Status byte after certain arithmetic operations. When I replace my 8080A CPU card with a Z-80 card, I can't assign a value to single precision variables. Ex:

      You type: A=5:PRINT A

      Altair prints 0, should print 5

      You type FOR I=1 TO 10:PRINT I;:NEXT I

      Altair prints

      0 0 0 0 0 0 0 0 0 ....

      Loop never ends since I is never incremented.

      Please help! TIA

      Tom L
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