Tandy 1400LT Service Manual page 289

7. Sprite Color Select Register
This is an 8 bit write-only register. Its address is hex "68" within the Register Bank.
The following is a description of the Sprite Color Select Register functions.
BIT NAME FUNCTION
S1-B
S1-G
S1-R
s1-I
S2-B
S2-G
S2-R
s2-I
BLUE SPRITE 1 COLOR SELECT
GREEN SPRITE 1 COLOR SELECT
RED SPRITE 1 COLOR SELECT
INTENSITY SPRITE 1 COLOR SELECT
BLUE SPRITE 2 COLOR SELECT
GREEN SPRITE 2 COLOR SELECT
RED SPRITE 2 COLOR SELECT
INTENSITY SPRITE 2 COLOR SELECT
SPRITE CONTROL/COLOR SELECT REGISTER
Bit 0
-
3 Select the Sprite 1 ANDing Foreground Color.
Bit 4
-
7 Select the Sprite 2 EXORing Foreground Color.
8. Control Data Register
The data, which are written in this register, are output in the R D ,us on the VSJ 'FL,.,, rise timing. It is possible
to latch this data into the outside register and is available to use control signal or data.
9. Color Palette
The LCDC contains a 16-word by 9-bit palette in the Register Bank which takes pixel information from video RAM
and uses it to select the color to display. This palette is used in all display modes.
This is write-only register and is writable anytime without any display flicker.
This palette looks like read-only memory with pixel information 4-bit addressing, which is the logical color code and
is called I, R, G and B bit by software, and outputs 9-bit color data and 3-bit for each R, G, B.information. This
output is converted to linear R, G, B signal corresponding to the binary value by digital to analog converter. Then,
16 colors out of 512 different colors can be displayed on the screen by this color palette.
This color palette is preset by the "RESET" signal to display the same colors as the IBM PC.
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