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Night Owl's Shareware - PDSI-006 - Night Owl Corp (1990).iso
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CPORT.HST
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1991-06-02
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v1.0 20 Apr 91
∙ Initial release.
v1.01 26 Apr 91
∙ Bug fix: If a program that used (or is using) the com port that
shares the same irq line as the one being opened did not disable
interrupts at the UART upon termination (or is still using it,
i.e. a mouse driver), it would prevent the UART at the port being
opened from asserting the irq line.
v1.02 18 May 91
∙ Bug Fix: The constants ON and OFF were defined correctly for
the function ComTx(), but were reversed for the functions
ComRts(), ComDtr() and ComOut1().
v1.10 28 May 91
∙ Change: If ComOpen is called when a com port is already opened,
the opened com port will automatically be closed and the new com
port will be opened. This is essentially the same as calling
ComReopen. This change makes the function ComReopen obsolete,
however, the function name 'ComReopen' is retained as a function
macro in order to maintain backwards compatibility to older
versions of Cport.
∙ New Functions: The functions ComOpenS(), ComParam(), ComChecksum()
and ComCrc16() have been added. ComOpenS is an alternative to the
function ComOpen() in that it uses a structure of parameters in
stead of discrete parameters. ComParam() fetches the current
parameters of the opened com port. ComChecksum() and ComCrc16()
perform a checksum and a 16 bit CRC respectively, on a block of
data. See cport.doc for a more detailed description of these new
functions.