4 May
2002
4 May
'02
6:09 p.m.
Well, here is the pinout of the typical IBM external floppy
drive (5.25) & interface:
External Diskette Adapter
-----------------------,
unused 1 | Diskette Drive
unused 2 | ,-----------------------
unused 3 |----------------| 2 unused
unused 4 |----------------| 4 unused
| |----- alignment slot
unused 5 |----------------| 6 Drive Select 4
Index 6 |<---------------| 8 Index
Motor Enable C 7 |--------------->| 10 Drive Select 1 *
Drive Select D 8 |--------------->| 12 Drive Select 2 *
Drive Select C 9 |--------------->| 14 Drive Select 3 *
Motor Enable D 10 |--------------->| 16 Motor On *
Direction Select 11 |--------------->| 18 Direction Select
Step 12 |--------------->| 20 Step
Write Data 13 |--------------->| 22 Write Data
Write Gate 14 |--------------->| 24 Write Gate
Track 00 15 |<---------------| 26 Track 00
Write Protect 16 |<---------------| 28 Write Protect
Read Data 17 |<---------------| 30 Read Data
Head Select 18 |--------------->| 32 Head Select
unused 19 |----------------| 34 unused
-----------------------' `-----------------------
Bottom Row Sockets 20 - 37 of the DB37S Connector are Ground
Now, here is what Chris gave me earlier for the Type 9331 Model 011:
External Signal Cable Connector
Table 7-1. Pin Assignments for 37 Pin D Shell Cable
Signal Name Signal Pin Ground Pin
Reduced Write Current 2 20
Drive Select 0 8 26
Motor On (Head Load) 10 29
Direction Select 11 29
Step 12 30
Write Data 13 31
Write Gate 14 32
Side one Select 18 36
Ready 9 27
Index 6 24
Track 00 25 33
Write Project 26 34
Read Data 27 35
Diskette Change 19 37
Two Sided 7 25
8-Inch Drive Attached 5 23
5.25-Inch Drive Attached
They look pretty compatible...
Now, the next step would be OS support. I think I know how
to make it work for an older DOS machine, but what about
Windows?
Anyone else done this yet?
Regards,
-doug q