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-PC register is 16 bits wide, so 62K addressable RAM + 2K ROM (app rom, not microcode)

-Opcodes are 1 byte wide (4 bits on SAP1)

-Instructions have a variable clock cycles (always 6 on SAP1)

-new instructions: CALL, RET, JUMP

-8bits ALU

-updated registers with flags and bi-direction

A microcoded and stacked SAP2 architecture can make a generic, usable computer. SAP1 is merely for teaching purpose and understanding how a simple computer works (4 bits ALU and PC, 16 bit RAM, separated run and program modes)

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Q: What is the difference between sap 1 and sap 2 computer architecture?
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