EJV103@PSUVM.BITNET (03/30/89)
I am working on a project and need to know which port to read to check
for a carrier detect. Only using BASICA since speed is not necessary. Since I
do not normally read this news group E-Mail is preferred.
>
Thanks
Ed Vargo
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BITNET: EJV103 @ PSUVM
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UUCP: rutgers!psuvax1!psuvm!ejv103jmv@sppy00.UUCP (Jim Vickroy) (04/03/89)
In article <78402EJV103@PSUVM> EJV103@PSUVM.BITNET writes:
=>
=> I am working on a project and need to know which port to read to check
=>for a carrier detect. Only using BASICA since speed is not necessary. Since
The register you need is the Modem Control Register (MCR) for the 8250. It's
located at port 0x03FE for COM1 and 0x02FE for COM2. Within the register look
at bit 7 (Receive Line Signal Detect (RLSD)).
hope this helps......
jim
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