Xerox Alto I Hardware Manual page 14

W
A S
K I
E G
U N
P A
L
S
== ==
==
:::::::::::::
===
== ==
==
II
D
E
C
0
D
E
R
p
R
E
I
N
0
C
R
0
I
D
T
E
Iv R
C
U
R
T
R
A
MPCRAM
...
S
4
E
4
N
K
16x12
T
2
,10
I
. Address
........
Modification
/ '
Logic
CRAM Address
I
-,
_J
I
MPX
I
\It
\
Address Address
Control Control
Next
Microinstruction
RAM ROM
Address
Bus
....
1Kx32
~
1Kx32
or or
3Kx32
2Kx32
Data Out
Data Out
I
I I
10
22
il
I
MIR
I
t
Instruction
Figure 2 -- Processor Control