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: 7-segment
New price:  
Display color: Red
    Display technology: LED
Size: 3"×5½"×1½" Display size: 8+2 digits
Weight: 6 oz    
    Entry method: Algebraic with precedence
Batteries: BP-8 (2×"AA" sealed NiCd) or 9V alkaline Advanced functions: trg, exp, log, drg
External power: TI AC-9132 adapter (5.7V AC 240mA) Memory functions: +
I/O: N/A    
    Programming model: N/A
Precision: 11 digits Program functions: N/A
Memories: 1 number
Program display: N/A
Program memory: N/A
Program editing: N/A
Chipset:   Forensic result:  

sr40.jpg (22494 bytes)Once again, a calculator that doesn't belong in my collection of programmable calculators. Yet it's here, a result of another irresistible thrift store bargain.

The SR-40 is, for all practical intents and purposes, identical to one of the most popular calculators ever made, the TI-30. It's the archetype basic scientific calculator with trigonometric, exponential, and logarithmic functions, parenthesis entry, and a single memory.

The TI-30, SR-40, and variations thereof represent an enormously successful line of calculators. Just visit a supermarket or drugstore today; chances are you'll see a derivative of this basic model that, despite its more colorful appearance and the presence of a few extra functions, will be nearly identical in terms of functionality to these old models.