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1989-08-26
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CTSPATCH.PRG
Copyright (C) 1989
by Bill Penner
26 August 1989
CTSPATCH.PRG is a program to fix the TOS 1.4 RS-232 RTS/CTS
handshaking problem. The program can be run as an autorun program
(placed in an AUTO folder and booted) or run when beginning to use
RTS/CTS handshaking.
Outside of the Rsconf() command not allowing the RTS/CTS mode to
be enabled, the RS-232 routines in the TOS 1.4 (April 1989) ROMs appear
to be bug free. The problem with the RTS/CTS routines is due to the
internal variable indicating the past state of the CTS line and the
active edge interupt register for the CTS line improperly set up when
the system initializes at powerup. CTSPATCH.PRG simply does the
initialization and exits.
Even with this program, many programs may not work with RTS/CTS.
This is primarily due to the various programs being written on a system
in which the RTS/CTS routines were not working (and causing system
crashes when enabled with older ROM's) and so many programs will
automatically turn off RTS/CTS handshaking.