Sharp PC-1450

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: 16 characters
Weight: 8 oz    
    Entry method: BASIC expressions 
Batteries: 2×"CR-2032" Lithium + 1×"CR-2016" Lithium Advanced functions: Trig Exp Cmem Snd 
External power:   Memory functions:  
I/O: Printer/cassette port     
    Programming model: BASIC 
Precision: 12 digits Program functions: Jump Cond Subr Lbl Ind  
Memories: 4(0) kilobytes Program display: Text display  
Program memory: 4 kilobytes Program editing: Text editor  
Chipset:   Forensic result: 8.99998153428  

pc1450.jpg (32264 bytes)What a find this was! I occasionally visit thrift stores and second-hand stores, looking for interesting calculators. The other day I had a very successful hunting trip: I returned home with an old scientific calculator (an APF Mark 50), a Casio FX-795P, and this rare Sharp PC-1450, all three machines in excellent working condition.

The PC-1450 is a BASIC programmable calculator. It shares a highly useful feature with the TI-74: it is a calculator mode, in which its buttons function much like the buttons on an ordinary scientific calculator. In other words, you can invoke functions that operate on the contents of the display register, as opposed to having to key in BASIC expressions in immediate mode. (As to why the designers of many newer calculators abandoned this calculator mode altogether, opting for the more cumbersome "formula display" mode of operation, I really have no idea.)

I have no manual for this beast, but I was able to discover a few things about its built-in BASIC interpreter anyway. For one thing, the PC-1450 BASIC has PEEK and POKE keywords, indicating the possibility of accessing the hardware or doing machine language programming. For another, the BASIC is fairly advanced and complete, it even contains the DATA statement, which I found is missing from the BASIC implementation on many a handheld device.

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)