Casio QT-2100 Service Manual page 18

5-3. SYSTEM FLOW
POWER OFF
POWER ON
CPU PORT
INITIALIZ
StartUp C language
for BOOTER
KEY
INITIALIZ
NO
YES
Press INIT button
NO
YES
Press 'FINIT' button
1
RESUME
OPERATION
: Operations in BOOT ROM
Note: When CHECK SUM is NG, BOOT ROM waits for power off again because of error.
It sends information about FINIT/INIT/RESUME and the input register at time of INIT to applications.
FROM
OPERATION
DRAM
OPERATION
I/O CONTROLLER
OPERATION
NO
CHECK
SUM?
OK
FINIT
OPERATION
— 16 —
1
Display INIT
Process register
NO
IPL boot code
YES
Process register
1 1
NO
CHECK
SUM?
OK
INIT OPERATION