VGA register list

VGA register list

VGA Register address table Register name Monochrome Display Mode Color Display Mode Mixed output register 3c2h 3c2h (VGA read port 3cch) Pending control register 3bah 3dah (VGA read port 3cah) Input Status Register 3c2h 3c2h Input Status Register 1 3bah 3dah VGA permitted registers 3c3h 3c3h Sequencer index register 3c4h 3c4h Sequencer data register 3c5h 3c5h CRT control index register 3b4h 3d4h CRT control data register 3b5h 3d5h Graph control index register 3ceh 3ceh Graphical control data register 3cfh 3cfh Property Controller 3c0h 3c0h DAC interface register 3c7h-3c9h 3c6h-3c9h

External register list Register name Write Port (Rack/VGA/TVGA) Read Port (Bytes) Read Port VGA/TVGA Mixed output register 3c2h ---- 3cch Feature control register 3bah ---- 3cah Input Status Register 0 ---- 3c2h 3c2h Input Status Register 1 ---- 3baii or 3dah 3baii or 3dah VGA permitted registers Valid only for VGA/TVGA Read/write ports 3c3h

CRT controller register list Register name Index Number (HEX) Write Port (Rack/VGA/TVGA) Read Port (Bytes) Read Port (VGA/TVGA) Address Register -- 3d5h/3b5h   3d4h/3b5h Total horizontal scan time 00 h 3d5h/3b5h   3d5h/3b5h Horizontal display ends 01 H 3d5h/3b5h   3d5h/3b5h Start of horizontal hiding 02 h 3d5h/3b5h   3d5h/3b5h End of horizontal blanking 03 h 3d5h/3b5h   3d5h/3b5h Start horizontal scanning 04 H 3d5h/3b5h   3d5h/3b5h Horizontal sweep ends 05 h 3d5h/3b5h   3d5h/3b5h Total vertical scan time 06 h 3d5h/3b5h   3d5h/3b5h Overflow 07 h     3d5h/3b5h Row scan preset 08 h 3d5h/3b5h   3d5h/3b5h Maximum number of scanned rows 09 h 3d5h/3b5h   3d5h/3b5h Cursor start 0ah 3d5h/3b5h   3d5h/3b5h Cursor ends 0bh 3d5h/3b5h   3d5h/3b5h Starting address of the video memory (high) 0ch 3d5h/3b5h 3d5h/3b5h 3d5h/3b5h Memory start address (low) 0dh 3d5h/3b5h 3d5h/3b5h 3d5h/3b5h Cursor Position (high) 0eh 3d5h/3b5h 3d5h/3b5h 3d5h/3b5h Cursor Position (low position) 0fh 3d5h/3b5h 3d5h/3b5h 3d5h/3b5h Vertical sweep start 10 h 3d5h/3b5h   3d5h/3b5h Vertical sweep ends 11 h 3d5h/3b5h   3d5h/3b5h Optical pen address (high level) 10 h Read-Only 3d5h/3b5h 3d5h/3b5h Optical pen address (low position) 11 h Read-Only 3d5h/3b5h 3d5h/3b5h Vertical display ends 12 h 3d5h/3b5h   3d5h/3b5h Offset/logical screen width 13 H 3d5h/3b5h   3d5h/3b5h Underline position 14 h 3d5h/3b5h   3d5h/3b5h Vertical invisibility start 15 h 3d5h/3b5h   3d5h/3b5h End of vertical blanking 16 h 3d5h/3b5h   3d5h/3b5h Mode Control 17 h 3d5h/3b5h   3d5h/3b5h Row comparison 18 h 3d5h/3b5h   3d5h/3b5h

Graphical controller register list Register name Index Number (HEX) Write Port (Rack/VGA/TVGA) Read Port (VGA/TVGA) Image Position 1   3cch (latency only)   Image Position 2   3cah (latency only)   Address   3ceh   Set/Reset 00 h 3cfh 3cfh Set/Reset allow 01 H 3cfh 3cfh Color comparison 02 h 3cfh 3cfh Shift/Function 03 h 3cfh 3cfh Bit Plane read Selection 04 H 3cfh 3cfh Mode 05 h 3cfh 3cfh Hybrid 06 h 3cfh 3cfh Ignore color 07 h 3cfh 3cfh Bit shielding 08 h 3cfh 3cfh