M69000 Asiliant Technologies, M69000 Datasheet - Page 95

• Manufacturer Part Number: M69000
• Manufacturer: Asiliant Technologies

Specifications of M69000

• Lead Free Status / Rohs Status: Supplier Unconfirmed

9-2
The CRT controller registers are accessed by writing the index of the desired register into the CRT
Controller Index Register at I/O address 3B4h or 3D4h (depending upon whether the graphics system is
configured for MDA or CGA emulation), and then accessing the desired register through the data port for
the CRT controller registers located at I/O address 3B5h or 3D5h (again depending upon the choice of MDA
or CGA emulation).
CRX
read/write at I/O address 3B4h/3D4h
This register is cleared to 00h by reset.
7-0
&+,36
7
CRT Controller Register Index
These 8 bits are used to select any one of the CRT controller registers to be accessed via the data
port at I/O location 3B5h or 3D5h (depending upon whether the graphics system is configured for
MDA or CGA emulation).
69000 Databook
CRT Controller Index Register
6
5
Subject to Change Without Notice
CRT Controller Register Index
CRT Controller Registers
4
3
2
Revision 1.3 8/31/98
1
0