ZX-Spectrum +3 disk B socket

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

Source: [The Hardware Book]

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