Instruction Set used in SIC/XE

Prerequisite – Instruction Set used in simplified instructional Computer (SIC)
As SIC/XE is upward compatible with respect to SIC, therefore all the instructions in SIC are also used in SIC/XE. The instructions unique to SIC/XE are:

MNEMONIC	OPERAND	OPCODE	EXPLANATION
ADDR	R1, R2	90	R2 = R2 + R1
CLEAR	R1	04	R1 = 0
COMPR	R1, R2	A0	compares R1 and R2
DIVR	R1, R2	9C	R2 = R2 / R1
LDB	M	68	B = M
LDS	M	6C	S = M
LDT	M	74	T = M
MULR	R1, R2	98	R2 = R2 * R1
RMO	R1, R2	AC	R2 = R1
SHIFTL	R1, n	A4	left shifts R1 n times
SHIFTR	R1, n	A8	right shifts R1 n times
STB	M	78	M = B
STS	M	7C	M = S
STT	M	84	M = T
SUBR	R1, R2	94	R2 = R2 – R1
TIXR	R1	B8	X = X + 1; compares X and R1

Here,
M stands for Memory
R1 and R2 are registers (A, B, S, T)

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