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45 lines
1.0 KiB
NASM
45 lines
1.0 KiB
NASM
; pip patch for cp/m 2.0 operation 10/4/79
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;
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; this patch fixes two errors which occur when
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; pip operates under the cp/m 2.0 release:
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; (1) the operation pip x=x,x previously
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; resulted in a duplicate file when the
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; final file size exceeded 16k bytes,
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; (2) the sequence of operations
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; user 5
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; pip b:=*.*
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; resulted in a BDOS disk select error
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;
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;
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; pl/m source level changes:
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; 0931.1 dest(freel) = 0;
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; 1055.1 dest(0) = 0;
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; 1057.0 (deleted)
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;
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; assembly language field patch:
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;
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org 01f0h ;patch area in pip
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dest equ 1dd8h ;location of "dest"
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freel equ 12 ;constant offset
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open equ 086eh ;local open subroutine
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;
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p1: ;patch #1 for line 931.1
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lxi h,freel
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dad b ;hl=.dest(freel)
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mvi m,0 ;dest(freel)=0
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jmp open ;open file
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;
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p2: ;patch #2 for line 1055.1
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lxi b,dest
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xra a ;zero to accum
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stax b ;dest(0)=0
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ret
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;
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; code overlays
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org 198ch ;line 931.1
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call p1 ;patch #1
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;
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org 1bd5h ;line 1055.1
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call p2 ;patch #2
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end
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