mac serial pinouts

NeXT Computer Serial Ports Serial ports A and B use 8-pin miniature DIN (MiniDIN-8) connectors. Both ports on a 68040-based NeXT computer are RS-423 compatible; the ports on a 68030-based NeXT computer are RS-422 compatible (though different). The following diagram and table describe the pin configuration of each port: 8 7 6 5 4 3 2 1 (ed. drawing makes each location look like a socket, not a pin, as would be found on the back side of the computer. That matches my '040 Cube.) Pin Signal Pin Signal 1 DTR 5 RXD 2 DCD 6 RTS 3 TXD 7 RTXC 4 GND 8 CTS NeXT-to-Modem Cable (MiniDIN-8 to DB-25) The following table describes the configuration of a cable used to connect a 68040-based NeXT computer to an asynchronous modem. This configuration supports RTS/CTS hardware flow control. MiniDIN-8 DB-25 Pin Signal Pin Signal 1 DTR 20 DTR 2 DCD 8 DCD 3 TXD 2 TXD 4 GND 7 GND 5 RXD 3 RXD 6 RTS 4 RTS 7 (Not connected) 8 CTS 5 CTS NeXT Null-Modem Cable (MiniDIN-8 to DB-25) The following table describes the configuration of a null-modem style cable used to connect a terminal, printer, or other computer to a NeXT computer. This configuration supports RTS/CTS hardware flow control. MiniDIN-8 RS-232 Pin Signal Pin Signal 1 DTR 8 DCD 2 DCD 20 DTR 3 TXD 3 RXD 4 GND 7 GND 5 RXD 2 TXD 6 RTS 5 CTS 7 (Not connected) 8 CTS 4 RTS NeXT Null-Modem Cable (MiniDIN-8 to MiniDIN-8) The following table describes the configuration of a null-modem style cable used to connect two 68040-based NeXT computers. This configuration supports RTS/CTS hardware flow control. MiniDIN-8 MiniDIN-8 Pin Signal Pin Signal 1 DTR 2 DCD 2 DCD 1 DTR 3 TXD 5 RXD 4 GND 4 GND 5 RXD 3 TXD 6 RTS 8 CTS 7 (Not connected) 8 CTS 6 RTS NeXT Null-Modem Cable (DTR Flow Control) The following table describes the configuration of a null-modem cable used to connect a NeXT computer to a printer that only supports DTR hardware flow control, rather than RTS/CTS hardware flow control. MiniDIN-8 RS-232 Pin Signal Pin Signal 1 DTR 8 DCD 2 DCD 5 CTS 3 TXD 3 RXD 4 GND 7 GND 5 RXD 2 TXD 6 RTS 20 DTR 7 (Not connected) 8 CTS 4 RTS

Heck of a time to ask, but NeXTs are on-topic now right? Right? I hope? The copyright on the back of my box says (c)1989. - Mark