Can't get Jazz 1 to work right on your modern computer? Get DOSBox! Whining because you didn't use a computer during the DOS age? Lern2DOSBox! Here's how:

Step 1: Get and install DOSBox.
Step 2: Extract JJ1 into C:\Jazz1\ (or any directory, for that matter.)
Step 3: Open DOSBox.
Step 4: In DOSBox, type "mount C: C:\Jazz1" (or the directory you put Jazz 1 in)
Step 5: In DOSBox, type "c:", then "Jazz".
Step 6: Profit.

So easy there's no mystery step!