Symbol

Hex code
I=0, I=1

Control
Signal

Microoperations

Memory-reference: (start at time T₃ if direct mode, I = 0. Indirect mode T₄ shown)

AND

0xxx, 8xxx

D₀T₄:
D₀T₅:

DR¬ M[AR]
AC¬ ACÙ DR, SC¬ 0

ADD

1xxx, 9xxx

D₁T₄:
D₁T₅:

DR¬ M[AR]
AC¬ AC+DR, E¬ C_out, SC¬ 0

LDA

2xxx, Axxx

D₂T₄:
D₂T₅:

DR¬ M[AR]
AC¬ DR, SC¬ 0

STA

3xxx, Bxxx

D₃T₄:

M[AR]¬ AC, SC¬ 0

BUN

4xxx, Cxxx

D₄T₄:

PC¬ AR, SC¬ 0

BSA

5xxx, Dxxx

D₅T₄:
D₅T₅:

M[AR]¬ PC, AR¬ AR+1
PC¬ AR, SC¬ 0

ISZ

6xxx, Exxx

D₆T₄:
D₆T₅:
D₆T₆:

DR¬ M[AR]
DR¬ DR+1
M[AR]¬ DR, if( DR=0 ) then( PC¬ PC+1 ), SC¬ 0

Register-reference: D₇I' T₃ = r, IR_i = B_i (i = 0, 1, …,11)

r:

SC¬ 0

CLA

7800

rB₁₁:

AC¬ 0

CLE

7400

rB₁₀:

E¬ 0

CMA

7200

rB₉:

AC¬ (AC)'

CME

7100

rB₈:

E¬ E'

CIR

7080

rB₇:

AC¬ shr AC, AC(15)¬ E, E¬ AC(0)

CIL

7040

rB₆:

AC¬ shl AC, AC(0)¬ E, E¬ AC(15)

INC

7020

rB₅:

AC¬ AC+1

SPA

7010

rB₄:

If( AC(15) = 0 ) then( PC¬ PC+1 )

SNA

7008

rB₃:

If( AC(15) = 1 ) then( PC¬ PC+1 )

SZA

7004

rB₂:

If( AC = 0 ) then( PC¬ PC+1 )

SZE

7002

rB₁:

If( E = 0 ) then( PC¬ PC+1 )

HLT

7001

rB₀:

S¬ 0

Input-output: D₇IT₃ = p, IR_i = B_i (i = 6, 7, ...,11)

p:

SC¬ 0

INP

F800

pB₁₁:

AC(0..7)¬ INPR, FGI¬ 0

OUT

F400

pB₁₀:

OUTR¬ AC(0..7), FGO¬ 0

SKI

F200

pB₉:

If( FGI = 1 ) then( PC¬ PC+1 )

SKO

F100

pB₈:

If( FGO = 1 ) then( PC¬ PC+1 )

ION

F080

pB₇:

IEN¬ 1

IOF

F040

pB₆:

IEN¬ 0