Xerox Alto I User Manual

o I) 2
o I MFunc
I DestAC I I x
M-Group
LDA (MFunc = 1)
ST A (MFunc = 2)
o IJFUnC I I X
J-Group
JMP (JFunc = 0)
JSR (JFunc = 1)
ISZ (JFunc = 2)
DSZ (JFunc = 3)
1 I SrcAC I DestAC I AFunc
A-Group
1 1
S-Group
COM (AFunc = 0)
NEG (AFunc = 1)
MOV (AFunc = 2)
INC (AFunc = 3)
ADC (AFunc =
4)
SUB (AFunc = 5)
ADD (AFunc = 6)
AND (AFunc = 7)
AugmentedFunc
8
)) 12 113
DISP
x = 0: Page 0 addressing
X = 1:
PC-relative addressing
X= 2: Base-register (AC2)
X = 3: Base-register (AC3)
DISP
14
SH
CY INL I . SK
L(SH= 1)
R
(SH=2)
S (SH=3)
Z(CY=1)
O(CY=2)
C(CY=3)
DISP·
--# (NL=1) SKP(SK=1)
SZC(SK=2)
SNC(SK=3)
SZR (SK=4)
SNR(SK=5)
SEZ(SK=6)
SBN(SK=7)
Figure 3 -- Instruction Formats

Xerox Alto I Specifications

General

Brand	Xerox
Model	Alto I
Category	Desktop
Language	English