Texas Instruments BA-55
Datasheet legend
Ab/c:
Fractions calculation
AC: Alternating current BaseN: Number base calculations Card: Magnetic card storage Cmem: Continuous memory Cond: Conditional execution Const: Scientific constants Cplx: Complex number arithmetic DC: Direct current Eqlib: Equation library Exp: Exponential/logarithmic functions Fin: Financial functions Grph: Graphing capability Hyp: Hyperbolic functions Ind: Indirect addressing Intg: Numerical integration Jump: Unconditional jump (GOTO) Lbl: Program labels LCD: Liquid Crystal Display LED: Light-Emitting Diode Li-ion: Lithium-ion rechargeable battery Lreg: Linear regression (2-variable statistics) mA: Milliamperes of current Mtrx: Matrix support NiCd: Nickel-Cadmium rechargeable battery NiMH: Nickel-metal-hydrite rechargeable battery Prnt: Printer RTC: Real-time clock Sdev: Standard deviation (1-variable statistics) Solv: Equation solver Subr: Subroutine call capability Symb: Symbolic computing Tape: Magnetic tape storage Trig: Trigonometric functions Units: Unit conversions VAC: Volts AC VDC: Volts DC |
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Texas Instruments BA-55
Yet another "almost programmable", the BA-55 is a business oriented calculator from Texas Instruments. Although obviously, business functions replaced common scientific functions such as trigonometric commands on this machine, it still unmistakably belongs to the same family as the TI-55-II or TI-55-III.
A remarkable oddity on this calculator is the presence of a printer port; this port connects to the same PC-200 printer as the high-end TI-66 programmable. (It'd be interesting to know if there were any other TI calculators with this proprietary serial port.) The calculator is even capable of listing programs, complete with alphabetic mnemonics! This is probably the lowest-end programmable calculator with such a program listing capability.
The programming model is very similar to that of the TI-55-II. No branches, loops, or conditionals, just sequential execution of a memorized series of keystrokes. The program area is too small for a Gamma function example, so here is Stirling's formula instead:
00 61 STO 01 01 1 02 85 + 03 01 1 04 02 2 05 54 1/x 06 55 ÷ 07 71 RCL 08 01 1 09 50 ex 10 55 ÷ 11 71 RCL 12 01 1 13 53 √ 14 65 × 15 02 2 16 93 . 17 05 5 18 00 0 19 06 6 20 06 6 21 95 = 22 91 EXC 23 01 1 24 60 yx 25 51 x-y 26 65 × 27 71 RCL 28 01 1 29 95 = 30 13 R/S 31 37 RST