Floppy Adapter for IBM PS/2 Model 85XX (55 / 56/ 57 / 90 wSLX)

This project is the result of the excellent (pre)work of https://github.com/jtgans/PS2FF/

It has been modified to integrate the last missing piece to make it working.

This card has been tested on a IBM PS/2 8557, and it is working like a charm with a GOTEK like floppy.

The current design is made simple with Troughhole

The licence is creative commons CC-BY-SA

Work based on

###This is the first release, small todo:

Change the BXC337 transistor and the TTL 74HC125 by a 74LS245 with using the 2nd line of buffer to manage the FDD Density select.
Change the design to SMD to make it more compact

Bill of Material

5x 1K resistor
1x CAP Ceramic 10pf (noise filter)
BC337 transistor
TTL 74LS125 or 74HC125 (prefer the HC)
PS/2 Male pin connecter (LCSC ref C707014)
Floppy Female pin connector right angle (LCSC ref C2897437)

Changes compare to June version:

Different PCB routing
Trough hole design
JP2 Jumper to short PS2_DATA_RATE pin with FLOPPY_DENSITY_SELECT
BC337 Transistor to inverse FDD_DENSITY