ZX-Spectrum +3's serial devices

If it is needed to connect any serial devices to the +3 it requires a serial lead with connections as follows:

     ___________________________
  __|   6   5   4   3   2   1   |
 |__   ### ### ### ### ### ###  |
    |___________________________|

             RS232 socket

PIN	FUNCTION
1	GND
2	TXD
3	RXD
4	DTR
5	CTS
6	+12V

Source: [The Hardware Book]

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