IMPORTANT NOTES: There is no carriage-return delay built into the
output channel. This means that a normal RS-232 printer cannot
correctly print, unless some form of hold-off (asking the Commodore 64
to wait) or internal buffering is implemented by the printer. The
hold-off can easily be implemented in your program. If a CTS (x-line)
handshake is implemented, the Commodore 64 buffer will fill, and then
hold-off more output until transmission is allowed by the RS-232
device. X-line handshaking is a handshake routine that uses multi-
lines for receiving and transmitting data.
Closing an RS-232 file discards all data in the buffers at the time of execution (whether or not it had been transmitted or printed out), stops all RS-232 transmitting and receiving, sets the RTS and transmitted data (Sout) lines high, and removes both RS-232 buffers.
$FFC3)-See Memory Map for more information on entry and exit conditions.
NOTE: Care should be taken to ensure all data is transmitted before
closing the channel. A way to check this from BASIC is:
100 SS=ST: IF(SS=0 OR SS=8) THEN 100 110 CLOSE lfn
|This page has been created by Sami Rautiainen.|
|Read the small print.||Last updated May 20, 1998.|