IBM RT Series Hardware Reference Manual page 175

Bit O-Bit 7 Start Address Low-These are the low-order 8
bits of the start address.
Cursor Location High Register
This is a read/write register pointed to when the value in the CRT
Controller address register is hex OE. The processor input/output
port address for this register is hex 3B5 or hex 3D5.
Cursor Location High Register Format
Bit 7 6 5 4 3 2 1 0
Bit O-Bit 7
I I I I I I •
High Order Cursor Location
Cursor Location High-These are the high-order
8 bits of the cursor location.
Cursor Location Low Register
This is a read/write register pointed to when the value in the CRT
Controller address register is hex OF. The processor input/output
port address for this register is hex 3B5 or Hex 3D5.
Cursor Location Low Register Format
Bit 7 6 5 4 3 2 1 0
Bit O-Bit 7
I I I I I I I •
Low Order Cursor Location
Cursor Location Low- These are the low-order
8 bits of the cursor location.
IBM Enhanced Graphics Adapter 35