Using a 3.5" Floppy Drive on the TI-99/4A
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Contributions by Marc Hull, Jon Vogel, and Tony Knerr.

1) Use a straight cable - no twists.

2) Change the drive select line ON THE CABLE in the appropriate place. 
Pin 10 is DSK1, pin 12 is DSK2, and pin 14 is DSK3. The appropriate lead 
goes to pin 12 on the floppy drive. With no changes, a standard 3.5" 
drive will be DSK2.

3) Mix and match whatever you want, if you've got mixed 5.25's and 3.5's, 
remove the termination packs from the 5.25's.

4) The HFDC doesn't like too much termination, other cards simply don't care.

5) Use only double density 3.5" disks unless you've got a Geneve and 
are using high density. Taping over the hole on high density disks is 
NOT RELIABLE, period.

6) Don't use a HD diskette on non-Geneve-HD systems - doing so can confuse 
the controller. If you have an HD drive, you might want to disable the HD 
sensor so that it never sees the hole. Doing so and using HD floppies 
anyway is taking reliability into your own hands (see #5).