A-AA+then

3" Floppy Disc Drive Interface. Computer Port (Connector)

3" Floppy Disc Drive Interfaces

34WIDC (34W IDC connector for floppy drive)
Spectrum +3 External FDD Interface: (1) Amstrad 3" model FD-1 FDD: (2)
Direction 34w Edge Connector (3) 34w IDC Connector Description Description 26w IDC Connector Direction
IN B1 34 /READY /READY 25 OUT
- T2 33 Signal Ground Signal Ground 26 -
OUT B3 32 /SIDE 1 SELECT /??? (4) 23 IN?
- T4 31 Signal Ground Signal Ground 24 -
IN B5 30 /READ DATA /READ DATA 21 OUT
- T6 29 Signal Ground Signal Ground 22 -
IN B7 28 /WRITE PROTECT /WRITE PROTECT 19 OUT
- T8 27 Signal Ground Signal Ground 20 -
IN B9 26 /TRACK 0 /TRACK 00 17 OUT
- T10 25 Signal Ground Signal Ground 18 -
OUT B11 24 /WRITE GATE /WRITE GATE 15 IN
- T12 23 Signal Ground Signal Ground 16 -
OUT B13 22 /WRITE DATA /WRITE DATA 13 IN
- T14 21 Signal Ground Signal Ground 14 -
OUT B15 20 /STEP /STEP 11 IN
- T16 19 Signal Ground Signal Ground 12 -
OUT B17 18 /DIRECTION SELECT /DIRECTION SELECT 9 IN
- T18 17 Signal Ground Signal Ground 10 -
OUT B19 16 /MOTOR ON /MOTOR ON 7 IN
- T20 15 Signal Ground Signal Ground 8 -
- B21 14 Not Used (NC) - - -
- T22 13 Signal Ground - - -
OUT B23 12 /DRIVE SELECT 1 NC? 5 -
- T24 11 Signal Ground Signal Ground 6 -
- B25 10 Not Used (NC) /DRIVE SELECT 0 3 IN
- T26 9 Signal Ground Signal Ground 4 -
IN B27 8 /INDEX /INDEX 1 OUT
- T28 7 Signal Ground Signal Ground 2 -
- B29 6 Not Used (NC) - - -
- T30 5 Signal Ground - - -
- B31 4 Not Used (NC) - - -
- T32 3 Signal Ground - - -
- B33 2 Not Used (NC) - - -
- T34 1 Signal Ground - - -

(1) From Spectrum +3 Manual
(2) By inspection of hardware: Drive is equivalent to a PCW8256/8512 "A" drive
(3) B=Bottom row, T=Top row
(4) Possibly not used as the drive is single-sided

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