Simtel MSDOS Archive CDROM, March 1997.  Walnut Creek CDROM.
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 I/O Utilities
 path: \disc2\io_utils 
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16550doc.zip 16550 docs/utils. Do you need a 16550 UART?
16550u.zip   Scan for serial ports on system, enable 16550
comchk18.zip Commchk 1.8: Serial port protocol analyzer
comfix12.zip Windows COM port 'bug' fix/DOS COM port setup
comprt25.zip Config COM/LPT ports: Show address, IRQ & UART
comst12.zip  Comset v1.2: Modem/UART/serial port tester
dlm140.zip   Data Line Monitor: Turn PC into a datascope
fx16550d.zip Corrects problem with AMI BIOS and 16550 UART
iomon2.zip   IO Monitor 386 control watches COM ports
kbfake10.zip Redirects serial input as if from keybd, w/src
lptfl10.zip  Redirect par. port output to a file or device
message.zip  Send msgs thru COM port between PCs, TSR w/src
para13.zip   Parallel port information & diagnostic util.
pf271.zip    Port Finder: Display info/swap LPT & COM ports
prlink20.zip File transfer prog. via printer/parallel port
qic02a10.zip Wangtek QIC-02 tape driver & Unix TAR I/O
redev100.zip Redirects AUX,COM1,etc to another char device
rs232101.zip RS232 v1.01: Debug most RS-232 problems
uartty12.zip Displays type of UART chip for all comm ports