IBM RT PC 10 Hardware Maintenance And Service page 278

4 Port Asynchronous RS422 Adapter
The 4 Port Asynchronous RS422 Adapter contains four asynchronous
adapters. The 4 Port Asynchronous RS422 Adapter uses the 110 channel
to communicate with the 32-bit processor or coprocessor.
Specifications
Slot positions
110 addresses
Interrupt levels
Bit rates
Bits per character
Maximum number
Removal and Replacement Procedures
2-5
Address range 1, 1230 - 124F
Address range 2, 2230 - 224F
Address range 3, 3230 - 324F
Address range 4, 4230 - 424F
9, 10, 11 (all shared)
50 - 19200 (set by program)
5, 6, 7, 8 (set by program)
3
Use the "Adapter Removal" on page 4-16 procedure for removal.
Use the "Adapter Replacement" on page 4-18 procedure for replacement.
Adapters
9-23