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VT8601 Apollo ProMedia
Revision 1.3 September 8, 1999
-74
VGA Extended Registers
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VGA Extended Registers
VGA Extended Registers – Non-Indexed I/O Ports
Port 3D8 – Alternate Destination Segment Addr ...........RW
7
Reserved
........................................ always reads 0
6-0
Alternative Destination Segment Address . def = 00
Read / write of this register is enabled by GRF[2].
This register becomes active when GR6[3-2] are not 00.
Port 3D9 – Alternate Source Segment Address ..............RW
7
Reserved
........................................ always reads 0
6-0
Alternative Source Segment Address ......... def = 00
Read / write of this register is enabled by GRF[2].
This register becomes active when GR6[3-2] are not 00.
Port 3xB – Alternate Clock Select ................................... RW
3xB notation indicates that this register is accessible at either
3BB or 3DB depending on the setting of the color / mono bit.
7-5
New Mode Control Register Bits 3-1 ..........def = 00
These bits have the same function as SRD[3-1]
4-2
Reserved
........................................ always reads 0
1-0
Video Clock Select ........................................def = 00
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