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