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80mm x 150mm x 30mm(max) (w,h,d)
Weight 220g (including batteries)
TheTI-57was a programmablecalculatormade byTexas Instrumentsbetween 1977 and 1982. There were three machines by this name made by TI, the first was the TI-57 withLEDdisplay released in September 1977 along the more It had 50 program steps and 8 memory registers. Two later versions named TI-57 LCD and TI-57 LCD-II have aLCDdisplay, but were less powerful (ran much slower) and had much less memory: 48 bytes to be allocated between program 'steps' and storage registers.
The TI-57 lackednon-volatile memory, so any programs entered were lost when the calculator was switched off or the battery ran out.
The LED display version of the TI-57 had a rechargeableNickel-Cadmium batterypack BP7 which contains twoAA sizebatteries and electronics to raise the voltage to the 9V required by the calculator. A popular modification is to power it from a9V batteryand use the battery cover of a LEDTI-30or a part of the dismantled battery pack. This modification provides a better battery life than the original battery pack.
HP Hewlett Packard 33E Scientific/Programable
The HP-33E and HP-33C were the basic scientific programmable members of the 30 series. The "E" model had conventional memory which lost its contents when power was turned off. The "C" model provided continuous memory. (After this series, continuous memory was considered basic functionality. The curator has, on several occasions had to explain to more recent calculator users that loss of data on power off was normal for older calculators.)
These calculators had two shift keys like theHP-32Eso in order to make room for the programming keys, some preprogrammed features had to be omitted including hyperbolics, percent change, most unit conversions, Q, and Q^-1. Also, because memory space was needed for programming, storage registers were limited to 8. In place of these features and storage registers they provided 49 step programming similar in style to theHP-25(plus subroutines) at about half the price. Of course, compared to the HP-25, the HP-33E/C also included linear regression and estimate, and degrees/radians conversion.