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Ahoy 1986 December
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Ahoy_Magazine_86-12_1986_Double_L.d64
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simple term.txt
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41 lines
SIMPLE TERM
by David Stidolph
This telecommunications program is
short and provides only a few
features: dialing, re-dialing,
waiting for calls, ASCII translation,
and full/ half duplex control. It
takes up very little memory and can
be extended.
The program was designed from the
beginning to be adapted by the user.
I tried to write it in the most
logical fashion I could so that you
can understand it without a lot of
comments. The program is under 300
lines long, so there is plenty of
memory space for improvements like
file transfer and bufferring.
One possible extension would be a
modem configuration procedure (for
parity, stop bits, etc.) that would
allow changes while the program is
running. As it is now, the modem is
opened for 300 baud, 8 data bits, no
parity, and one stop bit.
Many terminal programs I've seen had
a common flaw - improper carrier
detection. It seems that when you
call a number and get a busy signal,
the modem thinks it is another
computer and switches on the carrier
detect line. Terminal programs will
generally assume this is a valid
computer and connect the user. My
program has a wait loop that makes
sure it is getting a steady signal.