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*&$#=+*@* Texas Peripherals!

mdh

Experienced Member
Joined
Dec 9, 2021
Messages
84
Location
North East Ohio
So, I have one of these drives, and was trying to figure out where the drive selects were… well, they are on the bottom of the board, so if I want to make it a normal drive, I have to take the circuit board off….

I’d upload pictures, but they are too big, so need to get to a computer to fix them.
 

Chuck(G)

25k Member
Joined
Jan 11, 2007
Messages
38,865
Location
Pacific Northwest, USA
You have to understand that TPI was a joint venture of Tandon and Tandy/Radio Shack. These drives were intended for use in Tandy systems, so all drive selects (1-4) were brought out. The particular drive select was realized by pulling the contacts from the cable. So all drives (with the exception of termination) could be used in any position without re-jumpering. Somewhat like the IBM PC where all drive selects are set to 1 with the cable "twist" determining the drive (and motor) select.
 

ldkraemer

Veteran Member
Joined
Mar 14, 2013
Messages
2,096
Location
Chaffee, MO
Notice that NDS4 is Pin 34 of the Floppy Connector (NDS{1..4} in PDF), and there are solder pads for the DS{0..3}
Jumpers (or DIP Switches, if the traces are cut) on the PCB.

I've attached the TPI pages from the TRS-80 Model 4 Manual.

Larry
 

Attachments

  • DriveSelect.png
    DriveSelect.png
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  • TPI-Floppy-Drive.pdf
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