The AMSTRAD model FD-1 may be added to the +3 system as an additional disk drive. To connect the FD-1 to the +3, you will require the AMSOFT DL-2 disk interconnecting lead. Connect the end of the lead which is fitted with the larger edge-connector plug, into the socket marked DISK B: at the back of the +3. Connect the other end of the lead which is fitted with a smaller plug, into the socket at the back of the FD-1 disk drive.
DISK B socket 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34
.-. .-. .-. .-. .-. .-. .-. .-. .-. .-. .-. .-. .-. .-. .-. .-. .-.
|^^^^^^^^|^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^|
|________|____________________________________________________________|
`-' `-' `-' `-' `-' `-' `-' `-' `-' `-' `-' `-' `-' `-' `-' `-' `-'
1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33
(viewed from rear)
| PIN | FUNCTION | PIN | FUNCTION |
| 1 | Ready | 18 | GND |
| 2 | GND | 19 | MOTOR ON |
| 3 | SIDE 1 SELECT | 20 | GND |
| 4 | GND | 21 | not used |
| 5 | READ DATA | 22 | GND |
| 6 | D4 | 23 | DRIVE SELECT 1 |
| 7 | WRITE PROTECT | 24 | GND |
| 8 | GND | 25 | not used |
| 9 | TRACK 0 | 26 | GND |
| 10 | GND | 27 | INDEX |
| 11 | WRITE GATE | 28 | GND |
| 12 | GND | 29 | not used |
| 13 | WRITE DATA | 30 | GND |
| 14 | GND | 31 | not used |
| 15 | STEP | 32 | GND |
| 16 | GND | 33 | not used |
| 17 | DIRECTIONSELECT | 34 | GND |