IBM RT PC 10 Hardware Maintenance And Service page 272

Enhanced Graphics Adapter
The Enhanced Graphics Adapter attaches the Enhanced Color Display to
the system unit. The Enhanced Graphics Adapter contains 64K-bytes of
display memory. The display memory size can be expanded to 256K bytes
by adding the Graphics Memory Expansion Card (64K bytes) and Graphics
Memory Expansion Kit (128K bytes) to the adapter.
Specifications
Slot positions
110 addresses
Memory addresses
BIOS addresses
Interrupt level
Maximum number
Removal and Replacement Procedures
1
03CO - 03DF
OAOOOO - OBFFFF
OCOOOO - OCFFFF
9
1
Use the "Adapter Removal" on page 4-16 procedures for removal.
Use the "Adapter Replacement" on page 4-18 procedures for replacement.
Adapters 9-17