Tags: pdp-8*

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  1. Array Copy
    This program makes use of the auto-index registers at memory locations 10 and 11 to copy an array from one location to another. Location 10 (labelled as pArr1), references the array arr1 (the original). Location 11 (pArr1), references arr2 (the copy). Since the auto-index registers increment before being used, pArr1 and pArr2 are initialised to arr1-1 and arr2-1. Thus, when the first iteration of the loop executes, pArr1 and pArr2 will be correctly set to arr1 and arr2.
    / array copy:

    *0200
    cla cll

    / copy arr1 to arr2

    copy,tad i pArr1
    dca i pArr2
    isz count
    jmp copy

    / done

    hlt

    / data

    count, 7772

    / auto-indexing

    *10
    pArr1, arr1-1
    pArr2, arr2-1

    / the arrays

    *220
    arr1, 1111;2222;3333;4444;5555
    *240
    arr2,0;0;0;0;0
    2016-03-06 Tags: by klotz
  2. 2016-03-05 Tags: , by klotz
  3. This program blinks the AC and MQ lights.


    loop, 0000 2020 isz delay / create a delay
    0001 5000 jmp loop
    0002 7200 cla / clear AC so we can load it
    0003 1021 tad value / get value
    0004 7421 mql / stash AC into MQ
    0005 1021 tad value / fetch value again
    0006 7040 cma / complement AC
    0007 2021 isz value / get to next value
    0010 7000 nop / ignore possible "skip" from ISZ
    0011 5000 jmp loop / and do it all again
    delay, 0020
    value, 0021
    2016-03-01 Tags: by klotz
  4. 2016-03-01 Tags: , by klotz

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