Gavao GA-82TL-1
Brief History
Like previous Samsung replacement circuits, designing and manufacturing of chips for functional copies of each type of new calculators continued in China from the 1990s. A copy of the TL version of the Casio’s school scientific series fx-82 was also made and later replaced with a version with higher internal accuracy than the original. Several manufacturers have also created clones that match the shape and color of the original device, and they have appeared under numerous brands. Their type number consisted of two letters referring to the branding used and then the suffix “82TL”. For example, the Gavao version is GA-82TL, the Joinus is JS-82TL and the Taksun is TS-82TL. Over the years, their internal structure has been constantly changing, replacing the one large printed circuit board with the smaller one with the chip, and a foil PCB for the keyboard, which is held rigidly by a plastic backing. Unfortunately, the glued foil cables connecting the display — and in later versions, the keyboard — release over time, and the covers of the machines break very easily, so most of these types of clones have become completely unusable.
| Manufacturer: | Gavao (China) |
| Mfg. date: | 2007 |
| Size: | 7,5×16,2×1,9 cm |
| Weight (ready for operate): | n.a. |
| Type: | scientific |
| Capacity: | 10+2 digits (input/display) 16+2 digits (internal precision) |
| Operating logic: | formula-interpreting |
| Registers: | 2 standard (with saving the pending operation) 24 bracket (with saving the pending operation) 9 memory (with aritmetic) |
| Features: | %calculation with percent +/-change sign (direct entry of negative numbers) Ffloating-point notation Fixfixed-point notation: the listed decimals can be chosen (0-9) Sciscientific (exponential) notation Engengineering notation a b/callows entry and display of fractions BSbackspace (right-shift) function Sqrsquare root x2square pivalue of pi (3.1415..) can be recalled 1/xreciprocal trigtrigonometrical functions (sin, cos, tan and inverses: arcsin, arccos, arctan) hyphyperbolic functions (sinh, cosh, tanh and inverses: ar sinh, ar cosh, ar tanh) DMS-DDconversion of decimal and sexagesimal numbers logexponential and logarithmical functions (10- and e-base) yxraising to power SDone variable statistics: calculating mean and standard deviation LRtwo-variable statistics: linear regression nCrprobability calculations P-Rconverting coordinates between rectangular and polar systems n!factorial |
| Display: | 10+2+2 digit LCD |
| Power: | 2×AAA battery |
| Test results: | trigonometry:result of sin-1(cos-1(tan-1(tan(cos(sin(60°)))))), reference value: 60. 59.9999999938414 exponential:result of 0.999160000, reference value (first 14 digits): 3.0068804206375×10-70 3.006880419265E-70 |
Gavao GA-82TL-1
PCB of the GA-82TL-1
Keyboard of the GA-82TL
Similar items
