# MSX External Diskdrive

(at the Computer)

25 PIN D-SUB FEMALE at the Computer.

Pin | Name | Dir | Description
--- | --- | --- | ---
1 | +12V |  | +12 VDC
2 | +5V |  | +5 VDC
3 | +5V |  | +5 VDC
4 | /INDEX |  | Sector hole passed sensor.
5 | /DSEL1 |  | Drive Select 1
6 | DIR |  | Direction (0=In, 1=Dir)
7 | /STEP |  | Moves head 1 step in DIR direction.
8 | WRITEDATA |  | Write Data
9 | /WRITEGATE |  | Write Gate
10 | /TRACK00 |  | Head is over Track 00 (outermost track)
11 | /WRITEPROTECT |  | Write protected disk (0=Write protected)
12 | READDATA |  | Data read from diskette.
13 | /SIDESELECT |  | Side Select (0=Side 1, 1=Side 0)
14 | +12V |  | +12 VDC
15 | +12V |  | +12 VDC
16 | +5V |  | +5 VDC
17 | /DSEL1 |  | Select Drive 0
18 | /MOTOR |  | Motor On
19 | READY |  | Ready
20 | GND |  | Ground
21 | GND |  | Ground
22 | GND |  | Ground
23 | GND |  | Ground
24 | GND |  | Ground
25 | GND |  | Ground

Note: Direction is Computer relative Diskdrive.

Contributor: Joakim Ögren

Source:
Mayer's SV738 X'press I/O map

Copyright © The Hardware Book Team 1996-2001.
May be copied and redistributed, partially or in whole, as appropriate.
Document last modified: 2001-06-08