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Status test for Casio calculators FX-880p and FX-850p.
In our lovely calculators are some programs from the library not documented in the manual and not in the paper enclosure in the list of programs that comes with the calculator.
Some of these hidden programs, are:
- 0400 ->Testing program of the calculator.
- 0800 ->Program for the printer.
- 0900 -> Converter of PB100 to FX-850P.
To run the program you have to push the number of the program and then the key “LIB”.
Of these three, the one that seems most interesting to me is the 0400, the testing program.
It informs you of the memory installed on the Casio, and also it tells you how much memory you have installed in the expansion module.
Test the RAM and the ROM and it tells you whether they are fine. 
It shows all the pixels of the calculator lit in three different screens, for you to make you see easily whether there was a dead pixel.
Finally, it takes a “Printer CHECK” that I am not actually sure whether it means a check out of the port, or to plug a printer to check it out. 
The exact code of the program is in the popular annex at the manual of Alchemist
Library: 0400 Test of the calculator
| 10 | CLEAR:CLS:DEFSEG=0:K=PEEK(&H6B4)/4+PEEK(&H6B5)*64 |
| 20 | IF K<32 THENK1=8:K2=K-K1 |
| 30 | IF K=32 OR K=64 THENK1=32:K2=K-K1 |
| 40 | IF K=40THENPOKE&H8000,10:POKE0,0:IFPEEK&HA000=10THENK1=32:K2=8ELSEK1=8: K2=32 |
| 50 | PRINT”Main”;K1;TAB(8);”Kbyte Option”;K2;”Kbyte”;:PRINT:A=64:D=1:A1=0 |
| 70 | GOSUB1000:A=A+A:D=(D+D)MOD256:IF A<K*1024 THEN70 |
| 80 | FORI=1 TO9:A=K*1024-A1-1:IF I=5 OR I=9 THEND=&H80 ELSE D=&H20 |
| 100 | GOSUB1010:IF A1=0 THENA1=1 ELSEA1=A1*2 |
| 110 | NEXT |
| 120 | A=K*1024-A1-1:GOSUB1000:A1=A1*2:IF A1<K*1024 THEN120 |
| 130 | PRINT” OK RAM”;:GOSUB10000:PRINT:DEFSEG=&H4000 |
| 160 | ROM=(PEEK(4)+1+PEEK(5)*256)*2 |
| 170 | IF PEEK(0)<>&H43 THENPRINT”NG ROM 1″;:GOTO1030 |
| 180 | IF ROM<>1024 THEN200 |
| 190 | D1=PEEK(&H5955):D2=PEEK&HA6AA:D3=PEEK&HFFFF:DEFSEG=&H5000 |
| 191 | D4=PEEK0:D5=PEEK&H5955:D6=PEEK&HA6AA |
| 192 | IF PEEK&HFFFF<>&H20 THENPRINT”NG ROM 2″;:GOTO1030 |
| 193 | PRINT”OK 512K*2 ROM?”;:PRINT |
| 194 | PRINTRIGHT$(HEX$(D1),2);” “;RIGHT$(HEX$(D2),2);” “;RIGHT$(HEX$(D3),2);” “;RIGHT$(HEX$(D4),2);” “;RIGHT$(HEX$(D5),2);” “;RIGHT$(HEX$(D6),2);””;:GOTO210 |
| 200 | IF PEEK(ROM*128-1)<>&H20 THENPRINT”NG ROM 1″;:GOTO1030 |
| 201 | D1=PEEK&H5955:IF ROM=256 THEND2=PEEK&H26AA ELSE D2=PEEK&HA6AA |
| 202 | PRINT”OK”;STR$(ROM);”K ROM?”;:PRINT |
| 203 | PRINTRIGHT$(HEX$(D1),2);” “;RIGHT$(HEX$(D2),2);” “; |
| 210 | GOSUB10000 |
| 220 | CLS:FOR I=0 TO 63:PRINTCHR$(&HFF);:NEXT:LOCATE 0,0 |
| 230 | DEFCHR$(&HFF)=”FFFFFFFFFF”:GOSUB10000:DEFCHR$(&HFF)=”0000000000″: GOSUB10000 |
| 250 | DEFCHR$(&HFF)=”AA55AA55AA”:GOSUB10000:DEFCHR$(&HFF)=”55AA55AA55″:TRON: GOSUB10000:TROFF |
| 280 | CLS:PRINT”Printer CHECK”;:LPRINT:GOSUB10000 |
| 290 | LPRINT”Main”;K1;”Kbyte Option”;K2;”Kbyte” |
| 320 | FOR I=32 TO 255:IF I=&H7F THENI=&H80 |
| 330 | LPRINTCHR$(I);:NEXT:LPRINT |
| 350 | PRINT”RS 232C CHECK”;:PRINT:GOSUB10000 |
| 360 | OPEN “COM0:5,E,8,2,C,D,C,B,N” AS #1:PRINT#1,123:INPUT #1,D |
| 390 | CLOSE:IF D<> 123 THENPRINT”NG RS 232C”;:GOTO1030 |
| 410 | PRINT”OK RS 232C”;:GOSUB10000:PRINT |
| 420 | PRINT”MT CHECK <REC>”;:PRINT:GOSUB10000 |
| 430 | OPEN “CAS0:TEST” FOR OUTPUT AS #1:PRINT#1,”ABC”:CLOSE |
| 460 | PRINT”MT <REW> and <PLAY>”;:PRINT:GOSUB10000 |
| 470 | OPEN “CAS0:TEST” FOR INPUT AS #1:INPUT #1,A$:CLOSE |
| 490 | IF A$<>”ABC” THENPRINT”NG MT”;:PRINT:GOTO1030 |
| 510 | PRINT”OK MT”;:PRINT |
| 520 | END |
| 1000 | POKE A,D |
| 1010 | IF PEEKA=D THENRETURN |
| 1020 | IF A>=K1 THENPRINT”NG RAM 2″; ELSE PRINT “NG RAM 1”; |
| 1030 | BEEP:GOTO1030 |
| 10000 | BEEP:IF INPUT$(1,@)=CHR$(0) THEN10000ELSE RETURN |
Thanks, love the old calculator.
Hello, I have a big problem occur with my FX-880P.
When I want to run a program such as P0, I got the message “OM error P0-1”.
Then I try to check the Library Number 5050 which is quardratic equation, it appears “OM error”.
Could you please tell me how to solve this problem.
Thanks in advance.
Sorry for late answer, I was traveling
OM error
MEANING
a) lnsufficient memory ar system overflow.
b) Erroneous CLEAR statement specífication.
CORRECTION
a) Shorten program and check array dimensioning.
b) Check CLEAR statement value.
c) Use RAM expansíon pack.
Hello everybody, I have already solved this problem. The solution is just expand CLEAR statement value then the programs can be used as usual.
while programming my casio fx 880p i get a message at the end ov error. can someone help me
Hi Jean,
OV error
Meaning : Value exceeds allowable calculation result or input range.
Correction: Check values.
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