Tandy 1400LT Service Manual page 284

ADDRESS
346543210
DATA
7 6 5 4 3 2 1 0
REGISTER
FUNCTION
0000000
D7 D6 D5 D4 D3 D2 D1
DO
I I
I
I
I I I I
I
I I I I
I I I
D7 D6 D5 D4
D3 D2 D1 DO
Sprite Pattern data
0111 111
1OOOOOO
1 m 1
X X X X
X R2 R1 RO
X G2
G1 GO X B2 B1
B O
Color Palette # O
I I I I
I I I I
I I I I
I I I I
I
I
101 11 10
1011 111
X X X
X X R2 R1 RO
X G2
G1 GO
X
B2 B1
B O
Color Palette
#
15
1100Ooo
1 loo001
X
X X X X X X H8
H7
H6
H5
H4 H3 H2 H1
HO
Sprite Horizontal Location
1100010
11Ooo11
1100100
X X
X X X X X
X
'7
V6 V5 v 4 v 3 V2 v 1 VO
Sprite Vertical Location
rEST1 TEST0 S S 2 SS 1 SSO S 2 O N S1 ON BL
Mouse SRAM LCD MONO PAL 512/256 SCRl SCRO
Test/Sprite Control
Monitor Control
1100101
11001 10
-
MON
-
-
LCD MODE
- -
RAJ
-
1
0 3 2 1 0 1 0
MONO/LCD Control
1100111 16 PAGE M-SEL
-
EH
-
bit 4 3 2 1 0
Configuration Mode
1101Ooo
- -
s1
-
-
s 2
I R G B I R G B
Sprite Color Select
1101001
-
CON
-
7 6 5 4 3 2 1 0
Control Data
REGISTER BANK SUMMARY
All registers are write-only register.
1. SPRITE
The SPRITE is used for the Cursor, it can be displayed as a AND
&
EXOR pattern and is a sliding pattern on the
screen.
The Register Bank contains all the SPRITE informations.
The SPRITE 16
X
16 dot pattern is decided by SPRITE PATTERN DATA registers (hex 00-3F) and the
displayed location is decided by the SPRITE HORIZONTAL LOCATION (hex 60, 61), and SPRITE VERTICAL
LOCATION register (hex 62, 63). The blink mode and display enable/disable control data for the SPRITE are in
the TEST/SPRITE CONTROL register (hex 64) and the color information are in the SPRITE COLOR SELECT
register (hex 68).
The displayed location can be selected by dot units. The relation between origin point of SPRITE and display screen
coordinates is shifted 16 dots to the left and upward of the 320
X
200 screen mode.
The actual displayed SPRITE pattern is an overlapped part with the screen display active area as in the following
illustration.
F-15