AT&T MERLIN LEGEND Release 2.0 System Programming Manual page 58

Programming with SPM
a
floppy disk drive that will accommodate the SPM diskette
a monochrome or color monitor
a serial port that can use either a DB-9 or DB-25 connector
NOTE:
For a DB-9 connector, use a 9-pin to 25-pin adapter to convert the
25-pin connector to a modular connector.
an RS-232 interface cable
Also, depending on how you connect the PC to the control unit, you may need
the following:
either a 355AF modular adapter (if there is a male connector on the
interface cable) or a 355A modular adapter (if the connector is female)
a 4-pair modular cord (D8W)
In addition, the following equipment is useful:
a parallel printer (the PC needs a parallel port for the connection)
a 1200- or 2400-bps modem
NOTE:
SPM uses Interrupt 4 and I/O address 3F8 for COM1. It uses Interrupt 3
and l/O address 2F8 for COM2.
Direct Local Connection
For a direct local connection, connect the PC to the system programming jack.
This is the lower modular RS-232 jack on the processor module, as shown in
Figure 2-3. (The upper jack is reserved for the SMDR printer.) For direct local
connections, the system supports speeds of 1200 and 2400 bps. Use a direct
local connection to program in surrogate mode.
2-8 Connecting the PC