Block Diagram; Cpu (Central Processing Unit) - Radio Shack TRS-80 26-3650 Service Manual

2.
BLOCK DIAGRAM
LCD
AC-61225
Z\
R1-R15
V
CPU
HD61913A01
7y
v
D1-D8
CE1
CE2
OP
K1-K12
KEYBOARD
^>
RAMI
HD61914
77
— —
—
.,
RAM2
HD61914
EXPANSION
RAM MODULE
LCD:
12-digit
dot -matrix
display.
A
character or
a
number
is
displayed
in
5X7
dots.
CPU:
CMOS
VLSI one-chip microprocessor
unit.
RAM:
Stores data
and program. Each
RAM
has
1
K
bytes
(8K
bits)
capacity
and contains
self-control circuit.
-
3
-