Xerox Alto I Hardware Manual page 6

A personal computer system alto series
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RSEL[O·2]
---~
....
~
~
RSEL[3·4]
~
M
IR[1·2] .
~
P
I--~
IR[3.4]
~
x
---
LOADT
r--
P I--
ALUF[O·3]
~
R
6
0
SKIP
~
M
---
LOADL
3
SBANK - - - ,
L
RSEL
- . -
t
R
S
4
~
8x
32x 16
32x 16
"
"
L
t
~
j
1
..
MPX
I
t
I
.....
T
I
I
t
A
B
ALU
F
,
I
. . . . .1
L
M
I
I
Shifter
I
5
RSEL
-4 Constant
3
ROM
BS
-4
256 x 16
Processor
,
.
Bus
,
IR
- ALU Bus
MAR
Memory
Address
Bus
II
16
Decode
&
Control
Figure 1 -- Processor Data Paths
Monitor
Transceiver
I
Drive
I
I
I
I
I
Display
Ethernet
Control
I
Control·
I
I'
f'
I
Disk
Control
f'
I
II
W
,
I'
16
\11
Drivers
&
---
..
Parity
I~
-
Memory
J
- - Mous e
Data Bus I--
U
- - Keybo ard
N
32
K
,It
-
Main
Memory
4x64Kx 16
+
7
Error Corrected
DynamicMOS
t
- - Keyse t

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