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Hardware Level VGA and SVGA Video Programming Information Page
Sequencer Registers 

        The Sequencer Registers are accessed via a pair of registers, the Sequencer Address Register and the Sequencer Data Register. See the Accessing the VGA Registers section for more detals. The Address Register is located at port 3C4h and the Data Register is located at port 3C5h.

 
Reset Register (Index 00h)
7 6 5 4 3 2 1 0
SR AR
   
Clocking Mode Register (Index 01h)
7 6 5 4 3 2 1 0
SD S4 DCR SLR 9/8DM
   
Map Mask Register (Index 02h)
7 6 5 4 3 2 1 0
Memory Plane Write Enable
   
Character Map Select Register (Index 03h)
7 6 5 4 3 2 1 0
CSAS2 CSBS2 Character Set A Select Character Set B Select
   
Sequencer Memory Mode Register (Index 04h)
7 6 5 4 3 2 1 0
Chain 4 O/E Dis. Ext. Mem
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