Standard Tasks - Xerox Alto I Hardware Manual

Alto Hardware Manual
Bit
0
Bit 14
Bit 15
Task
o
1
2
3
4
5
6
7
lOB
llB
12B
l3B
14B
15B
16B
17B
APPENDIX C . RESERVED SIO BITS
·100000B
000002B
OOOOOlB
Standard Alto: Software boot feature -- See SID, section 3.3
Standard Alto: Ethernet
Standard Alto: Ethernet
Name Section
Emulator 3
KSEC 6
ETHER 7
MRT
DWT. 4
CURT 4
DHT 4
DVT 4
PART 5.5
KWD 6
APPENDIX D· STANDARD TASKS
Description
Lowest priority. Wakeup always true.
unused
unused
unused
Disk sector task
unused
unused
Ethernet task
Memory refresh task. Wakeup every 38.08 microseconds.
Display word task
Cursor task
Display horizontal task
Display vertical task. Wakeup every 16.666 milliseconds.
Panty task. Wakeup generated by parity error.
Disk word task
unused
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