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1.6.0 SYSTEM MICROPROGRAM
All the functions performed by the system are
controlled by the microprogram.
The system microprogram is composed of
micro-
routines
of varying sizes, each having a specific
task to perform. Each microroutine is composed
of bit-significant micro instructions that are
machine language instructions.
The microprogram handles:
•
System instructions
•
Data in main storage
•
Channel operations
The microprogram must be loaded into control
storage (initial microprogram load) before any
processing can begin. The microprogram can be
loaded from either the disk or the 33FD (CE
only) depending on the setting of the I MPL switch
on the CE control panel.
To begin the initial microprogram load operation,
press the LOAD key on the operator control
panel.
Press
LOAD
Key
IMPL
Switch
Activate Disk
-
Disk
[Skette
(33FD)
Activate 33FD
, -
Disk
33FD
~
IMPL
Control Storage
Main Storage
\
\
,
\
Microroutines
~--------------~
1-6
Micro
I nstructions
2 E A 3
E D 0 6
5 8 0
2 6 A 3
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