One day this may be a full 8-bit PC.

Clock

h

RAM

w
r
mr

Memory Address Register

Address Contents

Control Logic

Instruction Register - NOP

Step

Control Lines

hlt
pce
pcw
r4b
rmr
rcw
rcr
als
alw
alf
clr
clw

Bus Output

Program Counter

w

Register A

w
r

ALU

w
+
-
Z
O

Register B

w
r

Decimal Display

w

Power

Info

Machine code in RAM

No program loaded..

Code

0