Casio SF-8500, Service Manual & Parts List

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The machine will beep after 3 seconds.
The menu is unchanged. When there is no RAM to write a data,
the following message will be dis-
played.
EXECUTING !
NO RAM
DATA ERROR !
ADDRESS CORR RAM
XXXX XX XX
COMPLETE !
3. ROM/RAM check
1) RAM write
2) RAM read
Error end display is;
Normal end display is;
MEMORY 1 WRITE
2 READ
3 CHKSUM
4 SPECIFIC
INT #1 5 RTC
DISP CHNG key :Return to menu
SPREADSHEET key : Write the set pattern to the selected
RAM area
TEL key : Compare the pattern displayed after
# with the write data of RAM and
displays the results.
BUSINESS CARD key : Dump contents of memory. (direc-
tion depens on setting of internal/
extarnal switch)
MEMO key : Call up checksum and XOR values
for connected ROM/RAM data.
SCHEDULE key : Bring up clock display. The present
time, data and daily alarm can be set.
INT---Internal RAM
EXT--External RAM(RAM card)
#1---Test data pattern(00,01,02...)
#2---Test data pattern(FF,FE,FD....)
NOTE 1. To change the RAM internal or extenal, press HOME/WORLD key. As SF-8500 has no RAM card
interface, Test only Internal RAM area.
NOTE 2. To change the test data pattern,
press CALENDAR key for data pattern 1 (00,01,02,03,......FF,00,01,02,03,......).
press HOME/WORLD key for data pattern 2 (FF,FE,FD,......00,FF,FE,FD,...........).
To release this message, press DISP CHNG key.
To release this message, press DISP CHNG key.
It means RAM write is succeeded.