Epson PX-8 - Page 27

REV.-A
2.1.2 System Configuration
PX-8's main components include a main battery; the MAPLE (main) board, which along with con-
trol circuitry also contains an auxiliary battery; the LCD unit; the keyboard; and the microcas-
sette drive assembly. The following block diagram demonstrates component configuration.
\
Main
battery
f
I
GAH 40M
Microcassette drive
Drive mechanism
MAP-MC board
MAPLE board
LCD unit
I Auxiliary battery I
LCD panel
MAP-LD board
IPL
ROM
I
RAM
1
32K 64K
~~----------------------------~I
lr
1r
V
MAIN CPU
:S2C51/GAH40MJ
1
RS-232C
1
z-so
1
~ ~ - ----
n~
H
IiPD 7001
Barcode reader
I
SED1320
750S
1
I
I
U
J
1
Timer
Slave
CPU
ISED1320/VRAMI
I
6303
I
6K.
I
I
LCD
'"
MASK4K
I Microcassette 1
H
GAH 40S
I
I
1
_I tape drive
'"
~
GAH 40S
I
1
ROM capsule
1
1
I
~ Speaker I]
I (built-in/external)
1 Serial interface
I
1
Keyboard
I
1
Sub-CPU
750S
1
Analog device
1
1
Fig. 2-2 Computer Configuration
2-3