Sharp MZ-80B Owner's Manual page 55

46
The relation between the V-RAM output and CRT display is shown in FIGURE 4.6.
Address
$DOOO
($5000)
$D7CF
($57CF)
V-RAM
Character
Address
$EOOO
($6000)
$FF3F
($7F3F)
CRT
Display
V-RAM
Graphic I
L
Address
$EOOO
($6000)
V-RAM
Graphic II
$FF3F
($7F3F)
Switching by OUT port $F4
FIGURE 4.6 Relation between V-RAM and CRT display.
As shown in the figure, the V-RAM characters and graphic
(I)
or (II) can be displayed simultane-
ously .
The relation between the V-RAM addresses and corresponding positions on the CRT display is
shown in FIGURE 4.7.
• V -RAM characters
25 lines
$DOOO
($5000)
$D3CO
($53CO)
• V-RAM graphic
40 characters
$D027 $DOOO
($5027)
($5000)
25 lines
$D3E7 $D780
($53E7)
($5780)
80 characters
~------------------~
NOTE
200 dots
$EOOO
($6000)
$FF18
($7Fl8)
320 dots
$E027
($6027)
$FF3F
($7F3F)
The addresses when V-RAM
addresses are set in $5000 -
$7FFF mode are shown in
parentheses.
FIGURE 4.7 V-RAM addresses and CRT display
$D04F
($504F)
$D7CF
($57CF)