Explore an 8080 with Educator-8080 - Command Table

Table 1: Command List for Educator-8080. In order to illustrate the operations of the 8080 processor, Educator-8080 interprets a subset of the 8080's instructions. The subset generally references the accumulator, A, and registers B or C; it excludes all branching and program control operations. The complete list of available operations is found in this table.
		- Flags -
Command	Description of Operation	P	Z	S	A	C
ACI i	Add the value of the Carry Flag and the value of the immediate operand i to the contents of the accumulator	X	X	X	X	X
ADC r	Add the value of the Carry Flag and the contents of register r to the contents of the accumulator.	X	X	X	X	X
ADD r	Add the contents of register r to the accumulator.	X	X	X	X	X
ADI i	Add the value of the immediate operand i to the accumulator.	X	X	X	X	X
ANA r	Logically AND the contents of register r with the accumulator.	X	X	X	X	0
ANI i	Logically-AND the value of the immediate operand i with the contents of the accumulator.	X	X	X	X	0
CMA	Complement the contents of the accumulator, changing all of the zeros to ones and all of the ones to zeros.	N	N	N	N	N
CMC	Complement the value of the Carry Flag, if it is zero make it one, or if it is one make it zero.	N	N	N	N	X
CMP r	Compare the contents of register r with the contents of the accumulator.	X	X	X	X	X
CPI i	Compare the value of the immediate operand i with the contents of the accumulator.	X	X	X	X	X
DAA	Decimal adjust the value in the accumulator (after an arithmetic command using decimal numbers).	X	X	X	X	X
DCR r	Decrement (subtract 1 from) the contents of register r.	X	X	X	X	N
DCX rp	Decrement the contents of the register pair rp.	N	N	N	N	N
INR r	Increment (add 1 to) the contents of register r.	X	X	X	X	N
INX rp	Increment the contents of the register pair rp.	N	N	N	N	N
MVI r,i	Move the value of the immediate operand i into register r.	N	N	N	N	N
MOV r,s	Move the value of the contents of register s into register r leaving s unchanged.	N	N	N	N	N
NOP	No operation: do nothing.	N	N	N	N	N
ORA r	Logically OR the contents of register r with the accumulator.	X	X	X	0	0
ORI i	Logically OR the value of the immediate operand i with the accumulator.	X	X	X	0	0
RAL	Rotate the contents of the accumulator left one bit position with the high order bit going to the Carry Flag and the Carry Flag going into the low order bit of the accumulator.	N	N	N	N	X
RAR	Rotate the contents of the accumulator right one bit position with the low order bit of the accumulator going into the Carry Flag and the Carry Flag going into the high order bit of the accumulator.	N	N	N	N	X
RLC	Rotate the contents of the accumulator left one bit position with the high order bit going into both the low order bit and the Carry Flag.	N	N	N	N	X
RRC	Rotate the contents of the accumulator right one bit position with the low order bit going into both the high order bit and the Carry Flag.	N	N	N	N	X
SBB r	Subtract the values of the Carry Flag and register r from the accumulator.	X	X	X	X	X
SBI i	Subtract the values of the Carry Flag and the immediate operand i from the accumulator.	X	X	X	X	X
STC	Set the Carry Flag to a 1 value.	N	N	N	N	1
SUB r	Subtract the contents of register r from the accumulator.	X	X	X	X	X
SUI i	Subtract the value of the immediate operand i from accumulator.	X	X	X	X	X
XRA r	Logically Exclusive OR the contents of register r with the accumulator.	X	X	X	0	0
XRI i	Logically Exclusive OR the value of the immediate operand i with the accumulator.	X	X	X	0	0
Key:	i = any valid immediate operand (see text)
	r = any one of the three registers displayed A, B, or C.
	rp = must be the register pair B and C which is designated B.
	s = any one of the three registers displayed A, B, or C
Values for
FLAGS:	X = Changed value depends on operands and command.
	0 = Reset to zero always.
	1 = Set to one always.
	N = Not changed by this command.