ÓÉÍÐÌÅ ÔÅÒÍ
BY ÄAVID ÓTIDOLPH

ÔHIS TELECOMMUNICATIONS PROGRAM IS
SHORT AND PROVIDES ONLY A FEW
FEATURES: DIALING, RE-DIALING,
WAITING FOR CALLS, ÁÓÃÉÉ TRANSLATION,
AND FULL/ HALF DUPLEX CONTROL. ÉT
TAKES UP VERY LITTLE MEMORY AND CAN
BE EXTENDED.

ÔHE PROGRAM WAS DESIGNED FROM THE
BEGINNING TO BE ADAPTED BY THE USER.
É TRIED TO WRITE IT IN THE MOST
LOGICAL FASHION É COULD SO THAT YOU
CAN UNDERSTAND IT WITHOUT A LOT OF
COMMENTS. ÔHE PROGRAM IS UNDER 300
LINES LONG, SO THERE IS PLENTY OF
MEMORY SPACE FOR IMPROVEMENTS LIKE
FILE TRANSFER AND BUFFERRING.

ÏNE POSSIBLE EXTENSION WOULD BE A
MODEM CONFIGURATION PROCEDURE (FOR
PARITY, STOP BITS, ETC.) THAT WOULD
ALLOW CHANGES WHILE THE PROGRAM IS
RUNNING. ÁS IT IS NOW, THE MODEM IS
OPENED FOR 300 BAUD, 8 DATA BITS, NO
PARITY, AND ONE STOP BIT.

ÍANY TERMINAL PROGRAMS É'VE SEEN HAD
A COMMON FLAW - IMPROPER CARRIER
DETECTION. ÉT 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. ÔERMINAL PROGRAMS WILL
GENERALLY ASSUME THIS IS A VALID
COMPUTER AND CONNECT THE USER. ÍY
PROGRAM HAS A WAIT LOOP THAT MAKES
SURE IT IS GETTING A STEADY SIGNAL.