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Power-Programmierung
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CD1.mdf
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assemblr
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sampler1
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ibm2oki.asm
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Assembly Source File
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1985-01-08
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2KB
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341 lines
;*****************************************************************************;
;* This program traps the printer output interrupt (17H), and *;
;* translates outgoing IBM-style line drawing characters to codes *;
;* compatible with the Okidata 84p. *;
;* *;
;* Since the 84p doesn't fully implement all double-line characters, *;
;* we translate everything into single-line graphics. Other graphics *;
;* characters (hearts, happy faces, etc.) are not supported in this *;
;* program. *;
;* *;
;* The utility should be disabled prior to running any program (such as *;
;* Lotus 1-2-3) that depends on the okidata graphics character set or *;
;* uses the Okigraph graphics printing facility. *;
;* *;
;* USE: Giving the command "IBM2OKI" for the first time will install *;
;* the conversion utility and produce the report "IBM2OKI installed and *;
;* running." Thereafter, giving the "IBM2OKI" command will toggle the *;
;* translation feature off and on, reporting "IBM2OKI temporarily *;
;* deactivated." or "IBM2OKI reactivated." *;
;* *;
;* Copyright (C) 1983 Jeffrey P. Garbers. All rights reserved *;
;*****************************************************************************;
cseg segment para public 'CODE'
assume cs:cseg, ds:cseg
; The printer interrupt number is defined by the PC to be 17H.
printer_interrupt equ 17h
; The signature word is an arbitrary 16-bit number that we'll use in
; checking to see if the utility has already been installed.
signature equ 0944h
; DOS has a handy macro that calls DOS for service. Its first argument
; is a function code number. The second one (if it's there) is assumed
; to be an offset that needs to be loaded into DX
DOS macro fcn_code, location_arg
