Mitsubishi Electric LS Pro Hardware Technical Reference page 112

General registers The general registers cover a number of miscellaneous hardware functions. They are
used to select the I/O address range, to enable RAM, select dot clock speed, set sync.
signal polarity and write to bits on the feature connector. In the read mode, they give
access to two status registers.
The registers use two port addresses and are listed below:
Register
Miscellaneous output register
Input status register 0
Input status register 1
Feature control register
R - read
W - Write
M - monochrome
C - colour
These registers are standard VGA registers and are not described in further detail here.
Sequencer The sequencer register controls memory plane selection and shift register timing
registers functions. The registers are accessed by using index and data registers. To access a
register, first write to the index register with the index of the register to be accessed
as the data then write to the data register with the data to be loaded.
Register
Sequencer index register
Sequencer data register
R - read
W - write
M - monochrome
C - colour
The following table shows the index and the registers that are accessed via the index.
Register
Reset
Clocking mode
Map mask
Character map select
Memory mode
These are standard VGA registers and are not described in further detail here.
Memory and I/O Usage
Address
03C2h (WMC)
03CCh (RMC)
03C2h (RMC)
03BAh (RM)
03DAh (RC)
03BAh (WM)
03DAh (WC)
03CAh (RWMC)
Address
03C4h (RWMC)
03C5h (RWMC)
Index
00h
01h
02h
03h
04h
LS PRO HARDWARE TECHNICAL REFERENCE 5/21