Xerox 550 - A Xerox 550 Computer System

System
Control
Console
System
Control
Processor
Memory
Urut
Memory
Unit
~~ss;;;:--------' r
I Cluster (Basic) I I
I I I
I I I
Memory I I
I Interface I I
I I
I Processor ,Bus #1 I
I I I
I I
I
Processor I I
Memory
Unit
Pr"o~;----
Cluster (I/O)
Memory
Interface
Processor
Interface
r---
I Interface I I
____ I~ I I ~
I
~ rocessoq BUS 1fT T]"
"I
I
.-J
r-..L --,
System ,
Control I
Processor I
L_[_J
r- ,..-..,
I System I
I Control I
LC~o~J
Ex terna I Interrupts
0 ................ "- .... T ......... --.: .......... I r ........ II:' ...... I ..... 1 ............ 11:'
.,,"" ... ..., .................. _. _ ....... - ...... "'" & ...... -.-
DIO Bus
Communications
.-----1 Interface
Line
Adapter
Line
Adapter
Comm.
Lines
Comm.
Lines
:> I 12
I V Basic I U
Processor
I I
I I
I I
I I
MIOP
: I
o
~
Device
Controller
Device
Controller
I
_ ...J
o
~
I
I
I
Device
Controller
Device
Controller
MIOP
Dual Access Option Dual Access Option
Figure 1. A Xerox 550 Computer System
-,
I
I
I
I
I
Basic Processor 9