Casio PX-780 Service Manual page 40

Operation Guide
No.1 SDRAM
No Operation
Tap "1.SDRAM"
or
push "1" key.
1
Tap "1.SDRAM CHECK"
or
push "1" key.
2
Tap [Exit]
or
push "Enter" key.
3
Tap [Exit]
or
push "Enter" key.
4
Display
** SDRAM CHECK **
1.SDRAM CHECK
2.SDRAM CHECK (Loop)
3.SDRAM CHECK (Off On)
4.SDRAM CHECK (Write)
5.SDRAM CHECK (Read, Compare)
[Exit] or Enter Key
===== SDRAM CHECK =====
RAM SIZE = xxMbyte
Start addr = xxxxxx
Chk byte = xxxxxx
RAM Check Start.
Write/Read/Verify 0x5555AAAA
Write/Read/Verify 0xAAAA5555
-- RAM CHK OK --
[Exit] or Enter key
** SDRAM CHECK **
1.SDRAM CHECK
2.SDRAM CHECK (Loop)
3.SDRAM CHECK (Off On)
4.SDRAM CHECK (Write)
5.SDRAM CHECK (Read, Compare)
[Exit] or Enter Key
Back to Main Menu 1
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Inspection contents
_
Write → Read → Verify
the patterns of 0x5555AAAAH
and 0xAAAA5555H outside
the OS work area.
Confirm the display on the left.
Confirm the display on the left.
Confirm the display on the left.