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addsvp.arc
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ADDSVP.DOC
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1984-12-22
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Notes and documentation on ADDSEML.BAS ---
This program emulates an ADDS REGENT or VIEWPOINT terminal. Not
all of the escape or control sequences for this protocol are emulated.
Keypad and function keys are not emulated. Aux port is emulated in part.
Communication characteristics are no parity, 8 data bits, 1 stop
bit, no attention to handshaking, i/o using COM1: port.
Function keys work as follows:
F1 -- alternately sends ctrl-S and ctrl-Q to control output
F2 -- spare, does nothing right now
F3 -- toggles the value sent by the backspace key between ctrl-H
and DEL (127)
F4 -- toggles display between NORMAL and MONITOR modes; in NORMAL
mode, control characters are interpreted and acted upon, in
MONITOR mode, all control characters are displayed as the
inverse of the key (e.g. H in reverse will display if ctrl-H
is received, etc.); in MONITOR mode, DEL will display as a
half-tone blob; in MONITOR mode, display wraps around to next
line at column 80 since line feed and carriage returns are not
acted upon.
F5 -- toggles local echo on and off for half or full duplex operations
F6 -- toggles logging of received data to printer (LPT1:); if in
MONITOR mode, control characters will be underlined and DEL
will be a dark blob; works with dot matrix or daisy printers.
F7 -- clears entire screen and positions cursor to upper left corner
F8 -- toggles between white on black or black on white display
F9 -- sends a 250 ms break signal down the line
F10 - returns to DOS, leaving comm. line idle
If output to display falls more than 254 characters behind input to comm.
buffer, a ctrl-S is automatically sent. When it catches up again, ctrl-Q
is sent to refill buffer.
To use this program at 2400 bps or greater, you should compile it.
The following compiler switches are recommended:
/X/W/C:combuffer
The value for combuffer should be 4000 or greater if you will be
running at any speed above 300 bps. The /O switch depends upon
your runtime library choice.
This emulator was developed to interface an IBM PC with a Microdata Reality
System and subsequently enhanced to provide MONITOR mode and printer logging.
-------------- Walter Nicholes, Mark Gayman ---------------------
-------------- Division of Admissions and Records ---------------
-------------- Department of University Student Information -----
-------------- Brigham Young