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One day this may be a full 8-bit PC.
Clock
h
RUN
PULSE
RAM
w
r
mr
Memory Address Register
+
-
PULSE
READ
Address Contents
READ
WRITE
LOAD SAMPLE PROG
LOAD SAMPLE PROG 2
Control Logic
Instruction Register - NOP
Step
Control Lines
hlt
pce
pcw
r4b
rmr
rcw
rcr
als
alw
alf
clr
clw
ENABLE CL
READ
WRITE
Bus Output
RESET
TEST
Program Counter
w
ENABLE
WRITE
Register A
w
r
RESET
READ
WRITE
ALU
w
+
-
Z
O
WRITE
MIN
Register B
w
r
RESET
READ
WRITE
Decimal Display
w
Power
PC RESET
Info
Machine code in RAM
No program loaded..
Code
0