Sharp MZ-5500 - Page 98

[Ex]
B G
R
~
CRT
VDSO IT I 0 ! 0 I
VDSl
t!
Fig.15-?
· When 000 is set to three VDS bits, the background color corr e spond i ng t o
that window is displayed instead of the VRAM data in the wind ow ar e a.
°Mapping RAM
The mapping RAM controls the location and area o,f window in the display
screen area.
Bit
o 1· 2 3 4 5 6 7
30000H
3000lH
NOTE:
The mapping RAM cannot be
WO
W1
accessed from the epu.
3007FH
30080H
Not used
303FFH
tttiJIt=tJ
W2
W3
WO W1
W2
W3
,
,
--
\ 1\ 1
Column map
Row map
1024 words
128 words
Fig.1S . -8
The mapping RAtl exists on the GDC memory map as shown in Fig.lS-8.
It has to corresponds to the display screen when the mapping RAM is used
(Fig.lS-9).
CiS'