ccgms c= STOP off-hook

[prysm1]

I will take a look at this.  I have never seen anything on the C64 that actually uses DTR.

thanks a lot

not sure if it would help, but digging up the ccgmsterm code. i can see that it is trying to do something to the dtr or at least to the user port. i dont know enough of c64 to decipher this.

....
mopo1  .byt $20 ;pick up
mopo1  .byt $20 ;pick up

mopo2  .byt $00 ;hang up

mopo3  .byt $20 ;click on (pu)
mopo4  .byt $00 ;click off (hu)
....
;;.opt err        ;no list!!!

modreg = $dd01
datdir = $dd03
......

hangup    ;hang up phone
ldx #$20
stx datdir
ldx 653
cpx #2
beq pickup
lda mopo2
sta modreg
jsr curoff
lda #<dsctxt
ldy #>dsctxt
jsr outstr
jmp main

pickup
lda mopo1
sta modreg
jsr curoff
lda #<pcktxt
ldy #>pcktxt
jsr outstr
jmp main
pcktxt .byt 13,5,'Off-hook.',13,13,0
mopo2  .byt $00 ;hang up

mopo3  .byt $20 ;click on (pu)

mopo4  .byt $00 ;click off (hu)