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DTR.ASM
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Assembly Source File
|
1980-01-01
|
2KB
|
151 lines
upcase macro char
local nocvt
ifb <char>
upcase al
else
cmp char,'a'
jb nocvt
cmp char,'z'
ja nocvt
sub char,32
nocvt:
endif
endm
page 66,132
cseg segment byte public 'CODE'
assume cs:cseg,ds:cseg,es:cseg
org 100h
start proc near
jmp start1
db 13,'DTR (c)1985 by Donavon Kuhn and Jon Niedfeldt',13,10,26
start1:
mov bl,0 ;default com port (COM1:)
mov si,80h
start2:
inc si
mov al,[si] ;space off leading spaces
cmp al,' '
jz start2
cmp al,'?'
jz errexit
upcase ;using UPCASE without a parameter
cmp al,'C' ;(defaults to AL)
jnz nocom
mov cl,[si][1]
upcase cl ;using UPCASE using another register
cmp cl,'O'
jnz nocom
mov al,[si][2]
upcase al ;using UPCASE with AL as the parm
cmp al,'M'
jnz nocom
cmp byte ptr [si][4],':'
jz check_port
errexit:
lea dx,errmsg
errexit1:
mov ah,9
int 21h
mov ax,4c01h ;return ERRORLEVEL of 1
int 21h
check_port:
mov al,[si][3] ;get the com number
sub al,'1' ;convert to binary
cmp al,3 ;greater than com4?
ja errexit
add si,5
mov bl,al
nocom:
xor bh,bh
shl bl,1
mov ax,40h
mov ds,ax
mov ax,ds:[bx]
push cs
pop ds
cmp ax,0
jnz comok
lea dx,ncstr
jmp errexit1
comok:
mov dx,ax
add dx,4
in al,dx
dec si
start3:
inc si
mov al,[si] ;space off leading spaces
cmp al,' ' ;after COMx:
jz start3
mov al,[si]
upcase
cmp al,'O'
jnz errexit
mov al,[si][1]
upcase
cmp al,'N'
jnz noton
or al,3 ;set dtr bit
out dx,al
lea dx,onstr
exitok:
mov ah,9
int 21h
mov ax,4c00h
int 21h
noton:
cmp al,'F'
jnz notoff
and al,0fch
out dx,al
lea dx,offstr
jmp exitok
notoff:
jmp errexit
errmsg db 'Usage: DTR [COM1:|COM2:|COM3:|COM4:] ON|OFF',13,10,'$'
onstr db 'DTR is now ON',13,10,'$'
offstr db 'DTR is now OFF',13,10,'$'
ncstr db 'COM port not found',13,10,'$'
start endp
cseg ends
end start