Information in these datasheets comes from many sources. I do not claim that all the information presented here is accurate and reliable.

Years of production and price information is collected from Internet sources, such as the HP Calculator Museum. Sometimes, in the absence of reliable information, the figures are my estimates. If I could not provide a reasonable estimate, I left these fields blank.

Information about size, weight, batteries and battery packs comes from examining the actual units in my collection. Size and weight information is approximate.

Programming information is based on the manuals and my experience with these calculators. For instance, even though the Texas Instruments SR-52 is described in the manual as having 20 memories, I used the figure of 22, because, as many SR-52 owners know, an additional two memories (98 and 99) can also be utilized.

The following symbols and abbreviatons are used in these calculator data sheets:

Ab/c
Fractions calculation
AC
Alternating current
BaseN
Number base calculations
Card
Magnetic card storage
Cmem
Continuous emmory
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