Diag.exe is a program that will help you diagnose many of the HW interface and installation problems that you might encounter. This program allows you to turn on/off any of the 8 data bits on your parallel or serial port. Then, you can probe with a voltmeter, logic probe or scope to trace each bit from the computer, to the interface connector, to the inputs and outputs of the 74LS241 (or EDE300), and to the address pins on the CMOS switch.

Download 16-bit Diagnostic Program

Download 32-Bit Diagnostic Program

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