I have the floppy controller from a 5150 I'm restoring, with the wide bracket.
P/N 1809113. It uses an Intel 8272 controller chip instead of the uPD765 found on my XT controllers,
along with some custom IBM "cans" that look like what they used in the 370 mainframes.
Does anybody have the schematic for this earlier board?
All I have is PC Tech Ref 2.02 and it shows the later board.
Pic below shows the PC board (top) vs. the XT board (bottom).
A larger version of the image is at:
http://www.wrljet.com/rennpics/PCXT-Diskette-Adapters.jpg
Thanks, Bill
P/N 1809113. It uses an Intel 8272 controller chip instead of the uPD765 found on my XT controllers,
along with some custom IBM "cans" that look like what they used in the 370 mainframes.
Does anybody have the schematic for this earlier board?
All I have is PC Tech Ref 2.02 and it shows the later board.
Pic below shows the PC board (top) vs. the XT board (bottom).
A larger version of the image is at:
http://www.wrljet.com/rennpics/PCXT-Diskette-Adapters.jpg
Thanks, Bill