M69000 Asiliant Technologies, M69000 Datasheet - Page 139
M69000
Manufacturer Part Number
M69000
Description
Manufacturer
Asiliant Technologies
Datasheet
1.M69000.pdf
(360 pages)
Specifications of M69000
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10-4
SR02
read/write at I/O address 3C5h with index at address 3C4h set to 02h
Note: This register is referred to in the VGA standard as the Map Mask Register. However, the word “map”
is used with multiple meanings in the VGA standard and was, therefore, deemed too confusing, hence the
reason for calling it the Plane Mask Register.
7-4
3-0
&+,36
7
Reserved
Memory Plane 3 through Memory Plane 0
These four bits of this register control processor write access to the four memory maps:
0: Disables CPU write access to the given memory plane
1: Enables CPU write access to the given memory plane
In both the Odd/Even Mode and the Chain 4 Mode, these bits still control access to the
corresponding color plane.
69000 Databook
Plane Mask Register
6
Reserved
5
Subject to Change Without Notice
Sequencer Registers
4
Memory
Plane 3
3
Memory
Plane 2
2
Memory
Plane 1
Revision 1.3 8/31/98
1
Memory
Plane 0
0
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