Radio Shack TRS-80 26-3650

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
-