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82 lines
3.1 KiB
Plaintext
82 lines
3.1 KiB
Plaintext
CP/M V2.2
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Application Note 08, 2/20/82
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Nested SUBMIT Files
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Copyright 1982 by Digital Research
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CP/M is a registered trademark of Digital Research.
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DDT is a trademark of Digital Research.
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Compiled November 1982
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Applicable products and version numbers: CP/M V2.1 and V2.2
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Program: SUBMIT.COM
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The CP/M SUBMIT program allows you to embed another SUBMIT
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command within a submit file. However, control does not return to
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the original SUBMIT file after executing the nested SUBMIT command.
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To return control to the original SUBMIT command, use any standard
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editor to type the following procedure into a file named
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SUBPATCH.ASM:
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;
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;
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subfcb: equ 5bbh
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bdos: equ 5
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open: equ 211h
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;
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org 22dh ;submit erase subroutine
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;
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opsl: lda subfcb+15 ;file open ok if ext not full
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ral
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rnc
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lxi h,subfcb+12 ;try next extent
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inr m
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ops: lxi d,subfcb ;open extent
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jmp create
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;
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org 25dh ;submit create subroutine
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create: call open
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inr a
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jnz opsl ;loop if open ok
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lxi d,subfcb
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mvi c,22
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call bdos
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adi 1
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ret
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;
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; the following code calls the above routines
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;
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org 4feh
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;
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call ops ;open the $$$.sub file
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jc 517h ;jump if not opened ok
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lda subfcb+15 ;set current record to end
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sta subfcb+32
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jmp 51dh ;jump if open ok
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;
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org subfcb
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db 1 ;force $$$.sub file to A:
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;
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end
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Assemble SUBPATCH ASM to create the file SUBPATCH.HEX. Then use
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DDT to insert SUBPATCH.HEX into the SUBMIT.COM program, as shown
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below.
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A>ddt submit.com
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DDT VERS 2.2
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NEXT PC
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0600 0100
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-isubpatch.hex
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-r
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-g0
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A>save 5 submit1.com
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In the new program SUBMIT1.COM, control returns to the original
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SUBMIT file after the system executes embedded SUBMIT commands.
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Licensed users are granted the right to include these
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modifications in CP/M V2.1 and V2.2 software.
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