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Figures
6-8
1
6-9
1
6-10, 6-11, and 6-12
are provided to help you understand
mioro program concepts.
Press System Reset Key.
Hardware Set to Zero.
Priority Latch On
Press Start. Trap to
000. Set T -Reg. 01.
Set XH, XL Latch From
SI, S2.
Read UCW Byte I.
(Flags and Op Code).
Add 8 ta T-Reg.
MPX
Storage
Clear
01
10
Clear Byte Just Read.
Set Up V-Reg. Address.
Determine S3.
II
10
RD K Byte 28. Reset
S-Reg. to Zero Except
S3.
Lacal
Storage
Clear
01
LS Bytes C I eared
SI,S2 = 00
SI,S2 = 01
SI,S2=10
MPX
o
I
2
No
00
Set T -Reg to 01
Set XH, XL Latches
from SI, 52
Figure 6-8.
System Reset
6-28
In This Order.
K9
1050 Unit Status
K28
Op Code Mask
F4
}
1050 Sense
F5
and Status
F6
}
Cleared for
F7
Convenience
04
}
05
1050 Use
06
07
K4
RD. K4 Byte. H-Reg.
Priority Latch is Destina-
tion to Allow Traps.
Clear Byte Just Read.
Set S-Reg. to 00. Re-
set MPX Latches.
Set V-Reg to Zero.
Take Trap Now,
1£
Pending.
-
{
If No trap and Start
Key is Pressed Again-
L -_ _ _ _ _ _ _ _
--l
Continue to Load PSW
Routine From 0000.
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