Casio SF-8500 Service Manual & Parts List page 28

3) CHECK SUM
TYPE SIZE CHECK-SUM XOR
E0 ROM 512KB
CE RAM 128KB
Type : ROM and RAM are shown.
However, if the ROM is not in
standard Casio format, a format
error will be displayed.
Size : Memory capacity (total)
Checksum:
XOR : Logic operation for all data.
The ON key is the only key that remains
functional when an error has occurred
or check-sum is being displayed.
4) SPECIFIC (ROM check)
SPECIFIC SUM
E0 1CE2
4. Key check
KEY
1 RANDOM
2 AUTO
In either mode a press of the SEARCH key will return the screen to the menu mode.
When memory dump is operated by pressing BUSI-
NESS CARD button, a display will appear as shown
at left. The first two lines, begining from the top left,
signify the following address values in reference to
342B 6D
the one megabyte "E0" area:
00001,00002,00004,....,00080,00100,00200
8300 00
00400,00800,01000,....,20000,40000,80000
The lower two lines refer to the data in the "E1" area.
Note: The Internal/External switch is activated
5)
C6
Input can be made in the second and
third lines using the numeric keys.
Entry of 12 or more digits sets the time
and date. Entry of 4 or 6 digits sets the
daily alarm. The ON key clears current
entries.
SPREADSHEET Key :
The 'key code' will be displayed.
The 'key code' is numbered incrementally from
left to right with the DISPLAY CHANGE key as
"00", and TEL key as "02" etc. Accordingly,
the SET keys is "81". To release this test, press
SEARCH key.
TEL key :
Limits the mode mentioned above so that the
keys must be pressed in order according to the
key code. If an error is made a buzzer sounds
for about 1 second. (A correct entry results in a
beep tone)
— 27 —
pressing CAL button. SF8500 has no exter-
nal RAM area.
RTC
TM DISP
yyyymmddhhmmss........
..............
1990 04 04 12 34 56