Texas Instruments BA-54

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
Years of production:   Display type: Numeric display  
New price:   Display color: Black  
    Display technology: Liquid crystal display 
Size: 6"×3"×1" Display size: 8(5+2) digits
Weight: 4 oz    
    Entry method: Algebraic 
Batteries: 2×"LR44" button cell Advanced functions: Exp Fin Cmem 
External power:   Memory functions:
I/O:      
    Programming model: Keystroke entry 
Precision: 11 digits Program functions:  
Memories: 5(0) numbers Program display: Keycode display  
Program memory: 40 program steps Program editing: Overwrite capability  
Chipset:   Forensic result:  

ba54.jpg (25182 bytes)The BA-54 is functionally identical to the BA-55 calculator, but without the printer port.

The programming model of this calculator series is extremely simplistic; programs up to 40 steps in length can be written, using one of the data memory registers for each 8-step block. Programming is not available when the calculator is in the cash flow or statistical mode.

My favorite programming example, the Gamma function, is somewhat difficult to implement on this machine, since in addition to the small program memory size, the calculator also lacks the π constant function. Nevertheless, the following program is capable of computing the logarithm of the Gamma function to more than 5 digits of precision for arguments over 4.

00 65    ×
01 61    STO
02 01    1
03 59    lnx
04 75    -
05 71    RCL
06 01    01
07 95    =
08 91    EXC
09 01    1
10 54    1/x
11 55    ÷
12 01    1
13 02    2
14 65    ×
15 81    SUM
16 01    1
17 07    7
18 05    5
19 93    .
20 03    3
21 09    9
22 08    8
23 95    =
24 53    √
25 59    lnx
26 85    +
27 71    RCL
28 01    1
29 95    =
30 13    R/S
31 37    RST