Tandy 1400LT Service Manual page 287

Bit 3
Bit
4
Selects television type between PAL/SECAM type and NTSC type, a "1" selects PAL/SECAM.
Selects monitor, which can be connected to this controller output, between Color Monitor and IBM PC
Monochrome Monitor (The Sync signals are specialized to meet its monitor specification). The Color
Monitor means normal frequency display.
Selects between LCD Display and CRT Display, a "1" selects LCD Display.
Selects RAM, which can be configurated with this controller between static RAM and dynamic RAM. A
"1" selects static RAM use.
Selects pointing device, which can be connected directly to this controller, between Mouse and Light Pen,
a "1" selects Mouse device.
Bit 5
Bit 6
Bit 7
This register is preset to hex "01" by the RESET signal.
5. MONO/LCD Control Register
This is an 8 bit write-only register. Its address is hex "66" within the Register Bank.
The following is a description of the MONO/LCD Control Register.
BIT NAME FUNCTION
0
RAJ 0 Select Raster Adjust Number of Vertical
1 RAJ 1 Display Position for LCD Upper Half
2 LS 0 Select LCD Drive Type
3 LS 1
4 LS 2 Select LCD Drive Shift Clock
5 LS 3
~ ~~
~ _ _ _ _ _ _
6 MON 0 Disable Gray Scale Modification
7 MON 1
Select Monochrome Adapter Visibility
MONO/LCD CONTROL REGISTER
Bit 0,l These bits select Raster Adjust Number of vertical display position for LCD upper half. These two bits
should be programmed as follows:
BIT RASTER ADJUST NUMBER
1 0
0 0
0 1
1 0
1 1
0
2
4
6
RASTER ADJUST NUMBER
Bit 2,3 These bits select LCD Driver Type as follows:
LS1 LSO LCD Driver Type
0 0
Type 1 (dual one bit serial)
0 1
Type 2 (dual four bit parallel)
1 X Type 3 (dual four bit intensity)
SELECT LCD DRIVER TYPE
F-18