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msxz10.dtr
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1988-08-16
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1KB
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28 lines
title Processor to turn off COM DTR
;
; This program turns off the DTR signal on the communications
; port of a Zenith Z100 micro. This makes the Z100 compatible
; with the Gandalf PACX communications switch. The execution
; of this program should be the FIRST thing in the AUTOEXEC.BAT
; file. It MUST be before the DATE & TIME calls.
;
; This program is necesary because the vanila ZDOS leaves
; the DTR signal on after a reset or boot. A preferable
; solution would be to fix ZDOS, but this works too. Note that
; in either case it is the user's terminal emulator's resposibility
; to insure that DTR is raised at the beginning of a session AND
; lowered at the end.
;
; Mitch Blank
;
name OFF
code segment byte public 'code'
assume cs:code,ds:code,es:code,ss:code
org 100h
start: mov al,4 ; Turn off DTR & RTS
out 0EFh,al
int 20h
code ends
end start