Sharp MZ-5500 - Page 94

iii) Window controller (LZ90E07, LZ9lF07)
cGeneral description of the WDC
The window controller displ,ays a rectangular area from the VRAM in the
desired location of the display screen as shown in Fig.l i -2.
v- RA t1
eR T
A
B
Background color
~
Here, rectangular areas of
A, B, C, and D are called
window
Fig.lS-2
°Features
(1) A maximum of four windows can be displayed.
(2) Euch window ean have its priority specified, and, it allows overlay of
windows.
(3) When there ar .e three VRAM planes, it is possible to display by plane or
overlaid display of two or three planes.
(4) It is possible td make direct output of the inputted address without the
use of the window funetion.
°WDC registers
(1) RNO register (1/0 address 110H)
Register number (0 - 12) is set.
IX x x x ! RNO
RNO = O-12
(2) Priority register (1/0 address 112H)
Priority is set to window.
l 8 bits--7
RNO=O
I PWO I PWl! pW21 PW3 !
\ .L- Pr~ority
of the window ' 3
.'--- Prl0rity
of the windm.,;r 2
.
\
Priority
of the window 1
\
\...------- Priority of the window 0
.,
q,\