Crt Controller Registers - Mitsubishi Electric LS Pro Hardware Technical Reference

Memory and I/O Usage
CRT Controller The CRT controller registers handle the data associated with the CRT. The registers
registers are accessed by using index and data registers. To access a register, first write to the
index register with the index of the data register to be accessed, then read or write
to the data register.
Register
CRT controller index register
CRT controller data register
R - read
W - write
M - monochrome
C - colour
The following table shows the index and the registers which can be accessed via the
index.
Register
Horizontal total
Horizontal display enable end
Start horizontal blanking
End horizontal blanking
Start horizontal retrace pulse
End horizontal retrace
Vertical total
Overflow
Preset row scan
Maximum scan line
Cursor start
Cursor end
Start address high
Start address low
Cursor location high
Cursor location low
Vertical retrace start
Vertical retrace end
Vertical display enable end
Offset
Underline location
Start vertical blank
End vertical blank
CRTC mode control
Line compare
These are standard VGA registers and are not described in further detail here.
5/22 LS PRO HARDWARE TECHNICAL REFERENCE
Address
03B4h (RWM)
03D4h (RWC)
03B5h (RWM)
03D5h (RWC)
Index
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
0Ah
0Bh
0Ch
0Dh
0Eh
0Fh
10h
11h
12h
13h
14h
15h
16h
17h
18h