Quote:
Originally Posted by Station X
I had another play this afternoon. At this stage I just want to prove that the serial ports are working before I attempt to connect to the machine.
At start up the BIOS shows three com ports with addresses $3F8, $2F8 and $3E8.
Entering "mode" at the DOS prompt was a dismal failure, possibly due to the fact I can't find a way of pausing the display before it scrolls off the screen. I couldn't find a way of generating the pipe character | from the keyboard I was using.
Entering "mode com1/status" at the prompt returns "RETRY=NONE". Same for com2 and com3.
I configured com port 1 using "mode com1:9600,N,8,1,P. Did the same for com2 and com3. Got responses showing ports had been configured.
mode com1/status now returns "RETRY=B" Same for com2 and com3.
Entering "echo 1234567890 > com1" at the prompt returns "invalid device request writing com1". Same for com2 and com3.
I assume I have a hardware problem with the com ports?
|
Mode > fred.txt to create a text file if there is an editor on the machine.
I have forgotten most of this stuff but a quick look at a web site reminds that the retry is just what to do on timeout - but I think you should have got more info returned than just that.
Probably copy config.sys com1: would give the same invalid device error as the echo command. Any possibility the ports need RTS-CTS linked or special drivers for the ISA card (hopefully not).
Google found a similar but unresolved fault here:-
http://www.verycomputer.com/12_2bd04c9fc271e788_1.htm