Table of Contents
Advertisement
Set/Reset Register
This is a write-only register pointed to by the value in the
Graphics 1 and 2 address register. This value must be hex 00
before writing can take place. The processor output port address
for this register is hex 3CF.
Set/Reset Register Format
Bit
7
6
5
4
3
2
1
0
Bit O-Bit 3
Set/Reset Bit
0
Set/Reset Bit 1
Set/Reset Bit 2
Set/Reset Bit
3
Not Used
Set/Reset-These bits represent the value
written to the respective memory planes when the
processor does a memory write with write mode 0
selected and set/reset mode is enabled.
Set/Reset can be enabled on a plane by plane
basis with separate OUT commands to the
Set/Reset register.
Enable Set/Reset Register
This is a write-only register and is pointed to by the value in the
Graphics 1 and 2 address register. This value must be hex 01
before writing can take place. The processor output port for this
register is hex 3CF.
IBM Enhanced Graphics Adapter 47
Advertisement
Chapters
Table of Contents
