SAP-1 (Simple As Possible) 8-bit Computer
[Ben Eater's design, references Paul Malvino's Book - Digital Computer Electronics 3rd Edition]
Overview:
Clock:
A Register:
B Register:
Instruction Register: (differs from A and B Registers)
Memory Address Register (MAR):
Arithmetic Logic Unit (ALU):
Random Access Memory (16 byte RAM):
Program Counter:
Output:
Control Logic:
Bus LEDs:
Arduino EEPROM Programmer:
Notes:
MI = Memory Address Register IN
RI = RAM IN
RO = RAM OUT
IO = Input Register OUT
II = Instruction Register IN
AI = Address Register IN
AO = Address Register OUT
EO = ALU
SU = Subtract
BI = B Register IN
BO = B Register OUT
OI = Output Register IN
CE = Program Counter Enable (Increment Counter)
CO = Program Counter OUT
J = Jump
FI = Flags IN