I have a casio PB-120 calculator which I recently brought fromm ebay.However I am unable to write program in BASIC in using MODE 1.When ever I type in any command and press EXE button it shows ERR8 error.Going through the manual I found that this is a password error.I did not specify any password.Please help me out to recover the old password or reset everything so that I can write the programs.Even after pressing the Reset all button the problem exists.I mean it still shows ERR8 error.If there are any factory default passwords then also let me no the process to recover the password .
Error Recovery
Started by
indranil
, Jun 14 2010 08:26 PM
9 replies to this topic
#2
Xerxes
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Posted 16 June 2010 - 08:11 AM
There is no default password. I assume a malfunction of the PB-120, because "Reset All" should
delete a password protection too. To be sure that there is no problem with the reset button itself,
type in some characters before pressing it. Then check, if the characters are really disapeared.
delete a password protection too. To be sure that there is no problem with the reset button itself,
type in some characters before pressing it. Then check, if the characters are really disapeared.
#3
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Posted 11 May 2011 - 08:40 AM
I have a casio PB-120 calculator which I recently brought fromm ebay.However I am unable to write program in BASIC in using MODE 1.When ever I type in any command and press EXE button it shows ERR8 error.Going through the manual I found that this is a password error.I did not specify any password.Please help me out to recover the old password or reset everything so that I can write the programs.Even after pressing the Reset all button the problem exists.I mean it still shows ERR8 error.If there are any factory default passwords then also let me no the process to recover the password .
#4
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Posted 11 May 2011 - 08:43 AM
there lots of such computer malfunctioning... particularly this model...
try to remove the memory backup battery and hold it again...then press All Reset
try to remove the memory backup battery and hold it again...then press All Reset
#5
alank2
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Posted 07 July 2011 - 06:16 PM
Hi,
I too got a PB-120 from eBay, the memory battery was dead so you might replace it and see if that helps.
Does anyone know how to turn on the buzzer feature on a PB-120? This is where you press a key and it beeps for every key pressed. The LCD has a "BZ" for it, but I can't figure out how to enable it...
Thanks,
Alan
I too got a PB-120 from eBay, the memory battery was dead so you might replace it and see if that helps.
Does anyone know how to turn on the buzzer feature on a PB-120? This is where you press a key and it beeps for every key pressed. The LCD has a "BZ" for it, but I can't figure out how to enable it...
Thanks,
Alan
#6
Xerxes
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Posted 07 July 2011 - 08:29 PM
The key sound function is present on the PB-120 but AFAIK there is no command or key sequence for activation.
The only way I see would be manipulating the responsible flag in the system area directly, if the address was known.
The only way I see would be manipulating the responsible flag in the system area directly, if the address was known.
#7
alank2
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Posted 07 July 2011 - 09:10 PM
The key sound function is present on the PB-120 but AFAIK there is no command or key sequence for activation.
The only way I see would be manipulating the responsible flag in the system area directly, if the address was known.
Hi,
I wrote a small program on my tandy pc-6 to see if I could dig out the value. I used defm 256 and used the mode 18 command to peek the byte values into variables. I then changed the buzzer (mode . on this one) and didn't find any significant differences. I then started scanning 256-511 and found at 378:
378 = 128 when buzzer is off
378 = 0 when buzzer is on
I tried to poke this value into it using mode 19, but it won't take it...
My goal was to try to find the location, hope it was in a similar spot on the pb120, and poke it, but it looks like poke can only poke certain locations...
Thanks,
Alan
#8
Xerxes
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Posted 08 July 2011 - 01:36 PM
I haven't tested it, but it seems that the system overwrites the content of 378 after MODE19. If so,
it cannot be the location of that flag. I suspect a similar but not identical system area structure
of these pockets due to the different BASIC versions (PB-120=V2.1B and FX-790P/PC-6=V3).
it cannot be the location of that flag. I suspect a similar but not identical system area structure
of these pockets due to the different BASIC versions (PB-120=V2.1B and FX-790P/PC-6=V3).
#9
Xerxes
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Posted 10 July 2011 - 07:34 PM
I've made some tests on the FX-730P and found also the key sound flag at 378. It's really strange, but indeed there are
a few MODE19 resistant addresses in the system area including 378. Thank you for this discovery.
a few MODE19 resistant addresses in the system area including 378. Thank you for this discovery.
#10
alank2
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Posted 10 July 2011 - 09:54 PM
I've made some tests on the FX-730P and found also the key sound flag at 378. It's really strange, but indeed there are
a few MODE19 resistant addresses in the system area including 378. Thank you for this discovery.
Hi,
Sure thing; it is too bad that MODE19 doesn't work as I like the little beeping! Maybe I can SRAM it out, modify that byte and LRAM it back in. I'm going to make an interface based on this page eventually:
http://pisi.com.pl/piotr433/tape.htm
Thanks,
Alan
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