Top eight bits are reg address. Bits 24,25 are always 0, so address goes 0,4,8... Data lies in bits 0-23. See diagram
Address Register function
00-3C Video palette 0-F
40 Border col
44-4C Cursor palette 1-3
50-5C reserved
60-7C Stereo Image channel 7,0-6
80 Horizontal Cycle
84 Horizontal Sync Width
88 Horizontal Border Start
8C Horizontal Display Start
90 Horizontal Display End
94 Horizontal Border End
98 Horizontal Cursor Start
9C Horizontal Interlace
A0 Vertical Cycle
A4 Vertical Sync Width
A8 Vertical Border Start
AC Vertical Display Start
B0 Vertical Display End
B4 Vertical Border End
B8 Vertical Cursor Start
BC Vertical Cursor End
C0 Sound Frequency
C4-DC reserved
E0 Control
E4-FC reserved
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