Control Data Corporation INFORMATION SYSTEMS TERMINAL II Hardware Maintenance Manual page 35

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II
~ I
Figure 2-2. Alphanumeric Keyboard
RESET Switch
Pressing the RESET switch momentarily initializes the ter-
minal logic and causes a check sum test of each major con-
trolware block. Controlware blocks found to be in error
reload automatically. Pressing the RESET switch and
holding it down for longer than 3 seconds initializes the
terminal logic, initiates the terminal resident diagnostics
(as selected by front panel switches), and causes a full
autoload of the terminal's controlware from the PLATO
system.
Terminal logic is initialized as follows:
1. ROM and test mode selected
2. Next instruction fetch from address 0000
3. Interrupts disabled
4. Interrupt mask reset
5. I/O interfaces reset; ready to start new cycle
6. External indicators illuminated
7. Keyboard data not ready
8. PLATO communication character request set (trans-
mission aborted)
9. PLATO communication character ready; not changed
from previous state
82100083 D
2-3
022,,-1