I figured out the FDD. The FDD drive I used is a TEAC FD-235HF.
There are some differences and they need to be addressed.
For the most part, many of the lines are fine but wire 9 that IanB labeled in his comments as !NOTCH, is actual 5V on the T3200 and should not be used.
There are a few others that don't matter anymore because modern FDDs are a bit simpler and don't need them or even provide a signal.
The initial connection is the same as IanB's with wires 12 thru 26 as a straight thru cable:
wire 12 >> pin 18 !FDCDRC >> !Direction
wire 13 >> pin 19 GND
wire 14 >> pin 20 !STEP >> !STEP
wire 15 >> pin 21 GND
wire 16 >> pin 22 !WDATA >> !Write data
wire 17 >> pin 23 GND
wire 18 >> pin 24 !WGATE >> !Write enable
wire 19 >> pin 25 GND
wire 20 >> pin 26 !TRACK0 >> !Track 0
wire 21 >> pin 27 GND
wire 22 >> pin 28 !WPROTC >> !Write protect
wire 23 >> pin 29 GND
wire 24 >> pin 30 !RDDA >> !Read data
wire 25 >> pin 31 GND
wire 26 >> pin 32 !SIDE >> !Side select
With wires 1 thru 11 that need to be split apart, 4 are the same as IanB's
wire 2 >> pin 8 !INDEX >> !Index
wire 4 >> pin 12 !FDSELA >> !Drive select B
wire 6 >> pin 34 !DSKCHG >> !Disk change
wire 10 >> pin 16 !MONA >> !Motor on B
My modifications:
wire 8 >> pin 9 !READY >> GND (This must be grounded to work)
The line acts as an enable signal for several glue logic gates on the T3200 motherboard to connect to the FDD controller chip.
Pins 7, 9, 11, 13, 15, 17 are all free GND pins on the TEAC FD-235HF.
IanB had originally designated this as pin 5. TEAC floppies have no signal on pin 5 and are marked as N.C.
The remaining wires should be removed unless used for power, but they should never be connected to anything on the 34-pin connector.
wire 1 >> 5V
wire 3 >> 5V
wire 5 >> 5V
wire 7 >> 5V
wire 9 >> 5V
This last wire, wire 11, can be removed as it's not used.
wire 11 >> pin 2 !LOWDNS >> !High density
The modern floppies claim to be able to read low density disks but are not equipped to write low density. So this line has no place to connect.
Pin 2 on the the TEAC floppy is a N.C.
2023-06-18 17.15.32 crop.jpg
The new cable installed. I'm running the FDD off the HD power connector. I have already disabled the HD as it boots from a CF card now.
One question remains, and I'm not about to test it, is will this work without the XTIDE bios installed?
I've never attempted it. I have another T3200 in the garage I should pull out and check it over, I could test it on that. It's in pretty bad shape though, lots of rust on the back.