Internal Floppy Drive Connectors
This page was last modified 19:38, 2 April 2018 by Wild Penguin. Based on work by Gdx.

Contents

Panasonic FS-A1F, FS-A1FM (26pin)

pin Signal
1 N.C.
2 Ready
3 +5V
4 Index
5 +5V
6 Drive Select
7 +5V
8 N.C.
9 N.C.
10 Side Select (Select Head)
11 N.C.
12 Motor ON (Motor Enable)
13 N.C.
14 Direction
15 N.C.
16 Step
17 GND
18 Write Data
19 GND
20 Write Gate (Write Enable)
21 GND
22 Track 00
23 GND
24 Write Protect
25 GND
26 Read Data

Panasonic FS-A1WX, FS-A1WSX, FS-A1ST and FS-A1GT (24pin)

pin Signal
1 +5V
2 +5V
3 N.C.
4 +5V
5 +5V
6 Ready
7 GND
8 GND
9 Side Select (Select Head)
10 GND
11 Read Data
12 Write Protect
13 Track 00
14 Write Gate (Write Enable)
15 GND
16 Write Data
17 GND
18 Step
19 Direction
20 Motor ON (Motor Enable)
21 N.C.
22 Drive Select
23 Index
24 Disk Change

Sanyo MSX2+

pin (ODD) Signal pin (even) Signal
1 N.C 2 N.C
3 N.C 4 N.C
5 N.C 6 N.C
7 +5V 8 Index
9 +5V 10 Drive Select 1
11 +5V 12 Drive Select 2
13 GND 14 Drive Select 3
15 GND 16 Motor ON
17 GND 18 Direction Select
19 GND 20 Step
21 GND 22 Write Data
23 GND 24 Write Gate
25 GND 26 Track 00
27 GND 28 Write Protect
29 GND 30 Read Data
31 GND 32 Side One Select
33 GND 34 Ready (or N.C)

PC, Shugart, Sony MSX2+, NMS8250/55, AX500 and related

It makes sense to list these in the same table, since the pinouts are so close to each other. Every odd pin is GND.

pin PC Shugart Sony MSX2+ NMS82XX AX500
Odd pins GND GND GND GND GND
2 Density /DCD n/c n/c n/c
4 n/c Key (no pin) n/c In-Use n/c
6 n/c /DS3 n/c /DS3 n/c
8 Index Index Index Index Index
10 Motor A /DS0 /DS0 /DS0 /DS0
12 DS B /DS1 /DS1 /DS1 /DS1
14 DS A /DS2 /DS2 /DS2 n/c
16 Motor B Motor ON Motor ON Motor ON Motor ON
18 Direction Direction Direction Direction Direction
20 Step Step Step Step Step
22 Write Data Write Data Write Data Write Data Write Data
24 Write Gate Write Gate Write Gate Write Gate Write Gate
26 Track 00 Track 00 Track 00 Track 00 Track 00
28 Write Protect Write Protect Write Protect Write Protect Write Protect
30 Read Data Read Data Read Data Read Data Read Data
32 Side One Select Side One Select Side One Select Side One Select Side One Select
34 /DSKCHG Ready Ready (or N.C) Ready N/C

Some remarks (please edit if you have more information): information for AX500 and NMS825X was gathered from the service manuals of those computers.

It is probable (but not confirmed) that AX500 pinout applies to other AX computers with disk drives and possibly other related Yamaha computers.

Although DS2-3 seem to be connected on some computers, it is unknown wether they are usable or not.