C14A          HELP FILE - any key to scroll, STOP to escape.
USAGE:
     + - / * ^     SIN COS TAN     MOD DIV \  =      INT ROUND (or R)
     SQR  PI       ASN ACS ATN     AND OR EOR < >    DEG or RAD (angle mode)
     EXP LOG LN    ABS SGN         NOT TRUE FALSE    &=Hex mode ON/OFF
     RETURN displays answer.       TAB resets answer and variable TOT to zero
TO AVOID SHIFT KEY: use = as +, # as *, @ as SQR, ANY OF ([{}]) as brackets.
     ![6] = factorial 6. 2^10 = 2 raised to 10th power. 2^[1/10] = 10th root
Shortcuts:  / RETURN=reciprocal    # RETURN=square   @ RETURN=square root
            - RETURN changes sign  + RETURN doubles number
Number types: Decimal: 1234.56              Engineering: 2.2E6 = 2.2*10^6
              Hexadecimal, input as &13AF    Binary, input as B[1001001]
              & RETURN switches HEX/BIN answer display ON and OFF again

NUMBER DISPLAY (affects only the display, not calculation accuracy):
DPx = Sets number of displayed decimal points to x (x=0 to 9, default DP8).
DPE = Engineering Units. Number of significant digits is set by DPx. Cursor-
      right and Cursor-left shift the exponent for a more convenient display.
DPN = Revert to "NORMAL" display (floating-point, DP8).
AVERAGE: If several numbers are added together, each addition increments TOT
(see left of screen). Enter /TOT to find the average. TAB sets TOT to zero.
ANGLES:  DEG or RAD RETURN switches between degrees mode and radians mode.
With DEG visible (at left), SIN[30]=0.5 (sine of 30 degrees); ASN[0.5]=30
With RAD visible (at left), SIN[1]=0.84147 (sine of 1 radian); ASN[0.84147]=1
DEG[1] = degree equiv. of 1 radian.  RAD[30] = radian equiv. of 30 degrees.

FORMULAE:
Each Formula File contains Formulae F1 to F9. The File contains its own set of
variables (A to N), which can be used in any Formula. FORMA.TXT is loaded at
the start by default. FORMB.TXT up to FORMH.TXT can be created and used.
Ctrl-U and then 1-9 or A-N puts answer in F1-F9 or in Memory A B C etc.
Arrow up/down to scroll. Shift-Arrow up/down to go to first/last entry.
Ex 1: if F1 contains 2*PI, typing F1 gives 6.28318

Memories A B C...N can only contain numbers, which can be used in Formulae.
A Formula can use memories: F4={-B+SQR[B^2-4*A*C]}/[2*A] (quadratic solution)
Ex 2: if F2=SIN(a)^2+COS[a]^2, and memory A contains the angle, type F2 for
the answer (in this case it is always 1). NB: check DEG/RAD setting first.
Ex 3: F4 and F5 give the 2 roots of the quadratic equation A*X^2 + B*X + C = 0
using the variables stored as A B and C (which can be changed to other values).
If a root is imaginary, the message "Negative Root" is shown.

Save Formula File: Ctrl-S RETURN, A-H to save as FORMA.TXT, FORMB.TXT etc
Load Formula File: Ctrl-L RETURN, A-H to load from FORMA.TXT, FORMB.TXT etc
Formula files can be created and edited in a Text Editor (Protext, Notepad etc).
A file has 9 lines for F1-F9, followed by 14 lines for the variables A-N.
Each line (max. 70 characters) must end with a carriage return. A semi-colon
may be included; text following it is treated as a COMMENT, and ignored.

Expressions in Formulae:
Example - Celsius to Fahrenheit Conversion: Type 9/5+32 RETURN, then Ctrl-U 1
to put 9/5+32 into F1. Typing 20*F1 correctly converts 20 deg C to 68 deg F.
BRACKETS: In this example, 20 is multiplied by 9/5, and then 32 is added,
which is correct; it is calculated as typed. BUT 20*[F1] RETURN calculates
20*[9/5+32], giving 676, which is wrong.

Brackets are rarely needed, apart from ![6] (factorial) and B[10010] (binary).
SIN30 works as well as SIN[30]; similarly EXP1, LOG2 OR LOG 2, LN3 etc.
Sometimes they are needed, for instance 6/2+4 equals 7, 6/[2+4] equals 1. 
Brackets can clarify complex formulae and avoid errors. 

Formulae may not refer to themselves.

END of HELP. Press STOP to return to the Calculator
