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From: ingoldsby@calgary.UUCP
Newsgroups: comp.sys.m6809
Subject: Bit Banger port still won't input
Message-ID: <934@vaxb.calgary.UUCP>
Date: Fri, 29-May-87 00:37:02 EDT
Article-I.D.: vaxb.934
Posted: Fri May 29 00:37:02 1987
Date-Received: Sat, 30-May-87 08:43:10 EDT
Organization: U. of Calgary, Calgary, Ab.
Lines: 16
Keywords: CoCo III, OS9 Level II

I already asked this question, but all of the suggestions I got have proved
unsuccessful.  Has anyone managed to get the CoCo III serial port to read
data under OS9 Level II.  I have thoroughly checked my connections, but
nothing.  I've tried terminal programs, COPY /T1 /TERM, etc. and nothing
works.  The CoCo echos characters back to the sender, but never seems to
return a value to the reading process.  After a (long) while, the buffer
seems to fill and subsequent characters arriving at /T1 cause a BELL to be
echoed.  Does anyone know if T1 works on input?  Did Tandy use the
timer or interrupts in reading the port?  Can Tandy write drivers?

                                        Terry Ingoldsby
                                    ihnp4!alberta!calgary!ingoldsby

P.S.
I know the hardware works 'cause an ancient, very rudimentary terminal
program I wrote for the original CoCo works fine.