Sharp MZ-80B Owner's Manual page 56
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Also See for MZ-80B:
- Owner's manual (138 pages) ,
- Reference manual (94 pages) ,
- Service manual (83 pages)
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47
The input
and output of V-RAM for graphic can be controlled as follows by means of the data
delivered to the OUT port $F4.
Output data
V-RAM GRPH I
V-RAM GRPH IT
to port $F4
Input
Output
Input
Output
00
0
X
X
X
01
X
X
0
X
02
0
0
X
X
03
X
0
0
X
oc
0
X
X
0
OD
X
X
0
0
OE
0
0
X
0
OF
X
0
0
0
Note
Input
0:
V-RAM transfer enabled
X:
V-RAM transfer disabled
Output
0:
shown on CRT display
X:
not shown on CRT display
Suppose 03H is delivered to $F4 port with OlH being stored in $EOOO, then OlH is transferred to
V-RAM G-ll $EOOO, but not shown on CRT display because the display indicator is set at V-RAM G-1.
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