RS232 connections
The RS.232 socket is wired as follows:
1. No connection
2. TX data (input)
3. RX data (output)
4. DTR (input) this should be high when ready
5. CTS (output1 this should be high when ready
6. n.c.
7. Ground (pull down)
8. n.c.
9. +9v (pull up)
An RS232 cable is available from Sinclair Research. which connects the
9 way D-socket to a 25 way D-plug (25 way D-sockets are comma” on
RS232 peripherals). For details of how to obtain this cable, see the software
and peripherals catalogue included with the ZX Interface 1. This cable is
wired as follows:
2. TX data
3. RX data
5. CTS
6. +9v (normally DSR)
7. Ground
20 DTR
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