PLOUFF%mit-mc@sri-unix.UUCP (03/21/84)
From: Robert L. Plouffe <PLOUFF@mit-mc>
Message forwarded from Irv Hoff to fix the PMMI ring-back
function in MDM727-729.
#: 83977 Sec. 0 - Communications
Sb: #PMMI problem fixed
20-Mar-84 06:48:04
Fm: Irv Hoff 72365,70
To: Bob Plouffe 70220,113 (X)
Found the problem with the PMMI ringback. My fault. When I fixed MDM727 for
(0-9) numbers on redialing, and renumbered some labels, missed this one.
However, it's still a bit of a flakey circuit, as we wait 7 seconds after
dialing, hope it goes through all the exchanges and has rung once, then we hang
up, wait 5 seconds and go back and redial.
Call this MDM727-9.MOD
SUBJECT : MDM727 - MDM729 MOD FOR PMMI USERS FOR RINGBACK NUMBERS
FROM : IRV HOFF W6FFC
DATE : 18 MAR 84
This mod affects just PMMI modems that are using MDM727 and
later, including MDM728 or MDM729. Change one byte:
097F from 75 to 69 (then SAVE 73 sectors)
The ringback circuit should then work normally. When I fixed
MDM727 to allow redialing the new (0-9) numbers and changed some
some labels, this one was overlooked, sorry. If changing the
source code, make the following change:
;.....
;
;
; Hang up, redial and listen for dial tone
;
RINGBK1: CALL HANGUP ;hang up the phone
MVI B,RBWAIT ;wait 5 seconds before redialing..
CALL TIMER ;..for line to clear, etc.
CALL DIALBGN ;disconnect, reconnect, wait for tone
JNC DIAL12 ;go redial number
JMP DIALAGN ;no dial tone heard
;.....
;
- - - - - - - - - - - - - - -
(next to last line was: JNC DIAL13 which was incorrect)