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

2. BLOCK DIAGRAM
-,
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L
!
LCD
AC61225
~>
R1 - R15
01-08
A
..
,--,/
"'T
CPU
CE1
~
RAM1
HD61913A01
CE2
HD61914
-
~
Ilop
~
K1- K12
r - - - - - 1 - - - - -
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~
.,-
RAM2
KEYBOARD
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HD61914
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EXPANSION RAM MODULE
LCD: 12-digit dot-matrix display. A character or a number is displayed in
5
X
7 dots.
CPU: CMOS VLSI one-chip microprocessor unit.
RAM: . . Stores data and program. Each RAM has 1K bytes (8K bits) capacity
and contains self-control circuit.
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