Sharp MZ-80B - 4.1 The MZ-80 B system diagram

40
4.1 The MZ-80B s ystem diagram
Fig ur e 4.1 shows th e standard system configuration of th e MZ -8 0B personal comp ut e r.
RESET
SWITCH
IPL
RESET
SWITCH
FRAME
GROUND AC
~
.-----1,..]
u
POWER SWITCH
,c:=::::::1
II
POWER UN IT
I
+ SV
POWER
+12V
-SV
ONIPL
GROUND
RESET
-
l
R
E
.____,.
s
E
,J
T
-
A
'I
Z80A
A
..
CPU
I"
A
'I
<I>
CRYSTAL
4MHz
16
~
OSCILLA-
MHz
1_
TOR
31.25kHz
JL
L
E
D
"
Main Memory
RAM
3
2k byte s
IPL
1--
ROM 2k by te s
I--
L
r
RAM
32 k bytes
(OPTION)
ADDRESS
SELECTOR
r
I
J
. <
L I=
1111
I=
ADDRESS BUS
II 11
11
-
~
-
HA
HI
IS
I
J~
il_
CONTROL BUS
;>.
r-
HAND SHAKE
Z80A-PIO
PORTS
<I>
i'
'-
1--
KEYBOARD
FIGURE4 .1