Rbm Typical Configuration; Model 530/Sigma 3 Interrupt-Structure Comparison - Xerox 530 System Management Reference Manual

Xerox
530
CPU
4101
Computer
530
Sigma 3
Notes:
l.
2.
Core Memory (8K)
Memory Protect
Power Fai I Safe
Extended Arithmetic
Multiply,/Divide
Integral Interrupts (6)
Plus 4125 External Interrupts (12)
Real-Time Clocks (2)
lOP with 16 Channe Is
Plus 4105 two-Byte Interface
Keyboard Printer Control
l..----
~3
l
.~~33)
~
Remote
Assistance
Interface
4151
4151
8K Memory
8K Memory
I
3451
line
Printer
~
7250
Disk Controller
7121
- Card Reader
,-------to
8
Figure 2. RBM Typical Configuration
Table 1. Model 530/Sigma 3 Interrupt-Structure Comparison
Maximum No. of
1
External Interrupts Clocks Priority Levels> I/O
30, standard and
2 standard 2 standard
optional combined.
100, all optional 4 optional
100 opti ona I
-
4151
8K Memory
1
,,--
~
r"o..... . /
7251
(2.3 mb)
'-
~
7251
(2.3 mb)
'-
~
Priority Levels
<
1/0
2
4 standard,
24 optional
100 optional
Clock 1, set at a frequency of 500 Hz, is typically dedicated to provide RBM services relating to
I/o
timeouts, job accounting, and background-execution-time limit. There is a SYSGE N override
(ClK1FREQ,0); therefore, an installation may choose to forego these facilities in favor of real-time
usage of Clock 1. This should not be necessary however, since a Clock 1 receiver is provided.
RBM requi res that the lowest-priority hardware interrupt leve I be dedi cated to the RBM Control
Task.
4 Hardware Interrupt Requirements