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-
- CTTY.DOC
-
- I asked around about the DOS 2.0/2.1 function CTTY and could
- not find anyone familiar with it. So I put on my hacker's cap
- and "went to it." (After midnight, in true hacking style.)
- The DOS manual explains that the command is simply CTTY
- device-name. This will transfer control from the keyboard and
- screen to that device. It suggests that LPT1: is not a ood
- idea since the printer communicates (mostly) one way. What
- this really leaves is COM1:, COM2: and AUX: (Whatever AUX:
- is! [I'd love to hear from someone about AUX:])
-
- I very cleverly tried typing CTTY COM1: It does do something,
- it kills the keyboard and a cold BOOT is necessary to
- restart. Well, that wasn't it. Something must occur prior to
- the CTTY command. Being strickly a seat-of-the-pants type, I
- set the HAYES to ANSWER and called in. Nice, I had a
- connection (CARRIER/carrier). I rushed over to the PC
- keyboard and typed CTTY COM1: and the screen went dead. So,
- what else is new....But, on my other SYSTEM, (other end of
- the office), the prompt A> appeared. I sat and typed on the
- terminal just as though I was sitting in front of the IBM.
- Well, what do you know?
-
- 1) Commands are limited to what the terminal keyboard can
- reproduce i.e. ^C for CTRL-BREAK but not CTRL-ALT-DEL (as if
- you would want that one anyway).
-
- 2) Going to BASIC cuts you off. SYSTEM control returns to the
- keyboard.
-
- 3) Most commands work except COPY as it relates to CON: or
- COM1: COPY from disk to disk worked O.K.
-
- 4) This means is total control fr}M"outside while in DOS
- only on a line-by-line basis. Anything which relies on screen
- mapping will not work. (I ran Norton's DISKMAP from the
- terminal and the map appeared on the PC screen.)
-
- Now...
-
- You may be wondering why all this verbage. Well.... the
- result of my efforts is a BASIC program called RING.BAS which
- will set up the HAYES to patiently look for an incoming ring,
- and very politely turn SYSTEM control over to the caller. Oh,
- I forgot to mention the BASIC program must be called from a
- BATCH file called OUTSIDER.BAT. When RING goes back to the
- SYSTEM, the next command is CTTY COM1: Slick, huh? RING will
- even write the BATCH file for you. Just take a look at the
- internal documentation for additional information. The
- program is not fancy and I can think of lots to add to it,
- but I am sure you can too.....
-
- Dan Derrick 2/21/84 70215,1136
- END OF TRANSFER - PRESS ENTER TO RETURN TO MENU
- it,
- but I am sure you can too.....
-
- Dan Derrick 2/21/84 70215,1136
- END OF TRANSFER - PRESS ENTER TO RETU