Casio CE-6800 Service Manual page 24

6) RAM read only check
This test will check the read only check for RAM.
Perform the RAM check (EX: command "1 and #2 " ), before start of this operation.
Operation : X
Function X: 0= One time check.
NOTE: During the RAM test, the Receipt switch LED is blinking.
[PRINT]
7) RAM read write check
This test will check the read write check for RAM.
Operation : n
Function X: 0= Automatic RAM capacity detection
n: 1= Continuous check
[PRINT]
5 #2 Key
1= Continuous check. To stop the test, set the mode switch to OFF.
4 X 0 #2 Key
1= RAM1 (128K) test only
2= In the continuous check, the print will skip when the test is no error.
4= Read only check. No writing data.
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[DISPLAY]
[DISPLAY]