Hoopson PS-12MS scientific calculator
This model can be found in some shops in Brazil.I guess it is kind of rare, though.
A Chinese made machine distributed by "Mercoriental Importação e Exportação Ltda", copying the HP Voyager series style.
At first it looks like this model is cloning the Casio fx-82ms functions.
But the Mike Sebastian's Calculator Forensics test reveals a different beast inside.
This calculator seems to be able to work with 16 BCD digits internally, as the test result was: 8.999999998078897
A quick search in the Internet shows just a few machines with the same signature:
- Corner Office ATC-139
- Durabrand 828 (SC-1376)
- Fred Dual Power Scientific Calculator
Specifications:
- Two "AA" battery cells (3VDC)
- Two line display (text on top row, numeric on bottom)
- 10+2 digit numeric display
- 240 functions
- Made in China
Powering the calculator off will clear the display but the memory contents is preserved including the Ans register value.
Forensics test - extracting the remaining digits.
Dismantling the machine.
The back cover maintains the LCD display and the processor board in place.
Four small metal self taping screws need to be undone to remove it.
Mainboard PCB label: 82MS-9-2 13.06.14
After removing the back cover, the mainboard PCB and the LCD display are floating around.
Flexible flat cables interconnect the keyboard and display to the mainboard assembly.
The membrane keyboard is fixed using undone plastic rivets. Didn't try to dismantle it.
Reset key contacts on the left of the mainboard PCB assembly.
Back side of the mainboard and LCD display.
View from the unit top side.
