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View Full Version : HELP w/ isa serial i/o card!



Mike Chambers
September 1st, 2008, 02:58 PM
on my 1000 hx, i hooked up an ISA 8-bit multi-i/o card for serial after building a converter for the tandy PLUS ports based on the plus/isa pinout specs...

when i run MSD.EXE, it sees the COM port but delivers some weird information... all the jumpers are fine.

Port Address: 03F8H
Baud rate: 2 <---- wtf?
Parity: None
Data bits: 6
Stop bits: 1
Carrier Detect: Yes
Ring Indicator: Yes
Data Set Ready: No
Clear to Send: No
UART Chip Used: 16550AF

any clues?? i know my wiring is good to on the plus to ISA converter i've checked it at least 10 times now.

kb2syd
September 1st, 2008, 03:37 PM
Find a copy of PortFind. Does a much better job at I/O port ID.

Try Mode com1:1200n81 then run MSD.

Any better?

Mike Chambers
September 1st, 2008, 04:00 PM
it didn't help, and i can't use the port. in fact, it locks up procomm plus during initialization!

interestingly, portfind sees it as COM2 not COM1 and says there is a response from port 2F8! not sure what to make of this.

kb2syd
September 1st, 2008, 04:06 PM
Then in my opionion either the jumpers are NOT fine, or the ISA expander has problems. I've only had luck with cables that were just a few inches long.