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[3.3]
Missed Key Input
Missed Key
Input
Is
tee
Yes
.
Specific Key
pe}
Check Key Switch
Missed?
No
NO
| 3.2
*KBCLK
|
| | [| | L | || | [| | | | LI |
sT
"oOo"
ton
"or
wpe
to"
wpe
Ho"
"or"
t KBCLK"
"KBDATA"
*KBDATA
Is
IRQ1 Signal
No
_|
Keyboard Interface
OK?
II.
5.10
Yes
L
Are
KDB7 to
No
Serial Parallel
0 Signal
1
Converter
OK?
II.
5.10
Yes
LL
,|
Check PPI
(8255-5)
II.
5.10
t__.
Figure 9-12
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