Panasonic JB-3300 Technical Manual page 69

[3.2] No Key Inputs Available
No Key Inputs
Available
Keyboard
Yes
"KBCLK"
"KBDATA"
IRQ1 Signal
OK?
No
X:1J-18
INTR Signal
OK?
*KBDATA
+5 V Level
OK?
Keyboard Section
No
Cable or Connector
ew»| Reset Circuit
—mi IV. Keyboard »
ST wo" "on "oO" mye ton wae ton "to"
Keyboard
Interface
Interrupt
Controller (8259A)
X:2C-3 to 13
Keyboard
| Interface
Check
- MPU
- Data Bus
- PPI (8255-5)
Il. 5.3 to 10
L
Figure 9-11 (2/2)