Sharp EL-5500

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: Alphanumeric display  
New price:   Display color: Black  
    Display technology: Liquid crystal display 
Size: 3"×7½"×½" Display size: 24 characters
Weight: 5 oz    
    Entry method: BASIC expressions 
Batteries: 2×"CR-2032" Lithium Advanced functions: Trig Exp Hyp Lreg Cmem Snd 
External power:   Memory functions:
I/O: Interface port     
    Programming model: BASIC 
Precision: 12 digits Program functions: Jump Cond Subr Lbl Ind  
Memories: 6(0) kilobytes Program display: Text display  
Program memory: 6 kilobytes Program editing: Text editor  
Chipset:   Forensic result:  

el5500.jpg (32271 bytes)The Sharp EL-5500 is a vintage BASIC calculator.

Under Construction

As usual, I wrote a Gamma function program to test the capabilities of this machine. In it, I made use of the DATA statement to simplify the program a little. Here's the result:

10:DATA 76.18009172,9.5E-9
20:DATA -86.50532032,-9.4E-9
30:DATA 24.01409824,8E-10
40:DATA -1.231739572,-4.5E-10
50:DATA 1.208650973E-3,8.7E-13
60:DATA -5.395239384E-6,-9.5E-16
100:INPUT "X=",X
120:IF X>=0 THEN 160
150: GOTO 120
170:FOR I=1 TO 6
180:READ C,D
200:NEXT I
210:G=LN (SQR (2*π)*G/X)
220:G=G-X-5.5+LN (X+5.5)*(X+.5)