Interface Select Codes

Internal Select Codes
Select Code Device or Interface
1 Display (alpha)
2 Keyboard
3 Display (graphics)
4 Internal floppy-disk drive
5 Optional powerfail protection APCI (Series 400 computer)
6 APCI (Series 400 computer)
6 or 132 Display (bit-mapped graphics)
7 HP-IB
9 RS-232
14 or 28 SCSI
21 LAN
23 HP Parallel interface (Centronics compatible)

Factory Presets for External Interfaces
Select\Code Device or Interface
8 HP-IB
9 RS-232
10 (not used)
11 BCD
12 GPIO
14 High-Speed HP-IB
14 SCSI
20 Data Communications
21 Shared Resource Management
21 LAN
27 EPROM Programmer
28 RGB Color Video
30 Bubble Memory
32 Pseudo Select Code (Parity, Cache, Floating-point math hardware, and battery-backed clock)
33 EXT SIGNAL Registers (BASIC/UX)