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changed disk log ins also resets the directory to the root.) But if
you keep the disk in the drive you will not have any problems.
I am not sure how you can send this command string from within your
application, but it can be sent before. As long as the drive does not do a
hard reset or an ui command, then the new vector will be retained. If you
want to disable ui as well, its vector is at 194 and can be pointed to
the same rts. Once in your application, you can change the b dir
by the normal dos /0:disname command or /0: for the root dir.
One last caution: be careful about changing vectors. The order of the
vectors are documented on pages 108 and 109 of the 1581 manual
the code at the first location ($ff00) is jmp (190) etc.
Good luck and have fun
Miklos G.
1660 CARRIER DETECT MOD.
PICTORIAL BY RON GATCHEL
12/29/85
MODIFICATION OF 1660 MODEM TO PROVIDE
CARRIER DETECT SIGNAL BACK
INTO COMPUTER. CARRIER CAN THEN BE DETECTED
BY TERMINAL PROGRAM AS FOLLOWS:
IF(PEEK(56577)AND16)=0THEN [CARRIER IS
PRESENT]
THIS MOD HAS BEEN USED WITH
COMM-TERM 7.0, WITH GREAT SUCCESS!
NOTE THAT YOU WILL STILL NEED TO SWITCH
MODEM TO ANSWER MODE WHEN ALTERNATING
HI-LO TONES ARE HEARD IN SPEAKER (E.G.
WHEN CALLING A WESTRIDGE MODEM).
6777777777777777777777777777777775
6 O BACK (FOIL) SIDE O 5
6777 OF 1660 MODEM 5
6 AO O1 5
6 BO O2 NOTE THAT PINS G 5
6 CO O3 AND I DO NOT EXIST 5
6 DO O4 IN CONNECTOR AT LEFT. 5
6 EO O5 PIN 9 IS NOT SHOWN FOR 5
6 FO O6 CLARITY. 5
6 HO O7 5
6 JO O8 JUMPER WIRE 5
6 KO------------------. 5
6 LO O10 1 3 10 5
6 MO O11 OOOOOOOOOO 5
6 NO O12 IC1 5
6/// OOOOOOOOOO 5
5O 20 11 O 5
77777777777777777777777777777777
NOTE: PRY
MODEM CASE APART CAREFULLY
WITH LARGE SCREWDRIVER.
USE LOW WATTAGE IRON AND SMALL
WIRE. BE CAREFUL NOT TO LEAVE
A SOLDER BRIDGE BETWEEN PIN 3 OF
IC1 AND THE SURROUNDING FOIL.
AT - Attention: indicates to the modem that the following characters are a
command. Begins almost all commands. You must finish with a Return.
<3 plus signs> - Escape: interrupts a session by taking the modem out of
terminal mode and putting it into command mode, where you can issue more
commands or hang up. It does not require the AT prefix, but it must be
preceded and followed by at least one second of no data transmission. The
plus sign can be changed to another character (see Register 2 below).
A - Answer: tells modem to answer a call without waiting for a ring, allows
you to switch from voice to computer.
A<slash> - Again: repeats the previous command, generally used to redial
after getting a busy signal. Doesn't require AT before or Return after.
Cn - Transmitter Carrier: used when more than one modem is connected to the
same phone line. C1 (default) turns it ON fro normal operation iwth one
modem. C0 turns it OFF for setting a RECEIVE ONLY condition of an
additional device sharing the phone line.