Sharp MZ-80B Owner's Manual page 54

45
On the other hand, when accessing the V-RAM with the program in main memory following
$DOOO, the V-RAM addresses may be changed to $5000 to $7FFF, which is realized by setting the A
6
terminal of PIO to high state.
That is, the following instructions are executed. (At this time, the A
7
terminal of PIO may be
either high or low state.)
IN A, (E8H)
SET 6, A
OUT (E8H), A
This address switching is shown in FIGURE 4.5.
Address
$0000 .--------,----,
RAMI
Adr.
$4FFF
/VSwitching by PIO A
6
(
I
$5000
RAM I Adr.
V-RAM
Adr.
V
Switching by OUT p
$5FFF
Character
l /
$6000
$7FFF
$8000
RAM I
RAM ll
(Option)
Adr.
y
Adr.
$FFFF ~---~~~
1\'
V-RAM V-RAM
Graphic I
Adr. Graphic ll
(Option)
~L
(Option)
-r
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FIGURE
4.5 Switching of main memory and V-RAM (2)
J
Adr.
J
ort $F4