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Stop
2nd Error
Figure 3-54.
Yes
No
H6
On?
No
Yes
Stort
0004
H5
On?
Yes
Multiplexor
Error Routine
From Selector or
I------------------....,~ Multiplexor Error Routines
HI
On?
No
Set HI to
a ONE Enter
Machine Check
Error Rout i ne
1. Store MC-Register
in Location 80
2. Store 20 in Loc. 81
(if CPU Error)
3. Store Old PSW
4. Set Registers to
Good Parity
5. Allow A-Reg
Checks-
Load New MC
PSW - Perform
Control Program
for Handling
Machine Checks
Reset HI when
Contro I Program
Issues "Lood PSW"
Continue Instructions
Me Micro Program
Selector Channel
Error Routine
I,J,U, V, T,G, L, D
Set to Good Parity
Wi th HI Reset
Further Errors are
Considered First Error
No CPU Clock Stop
3-75
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