THE GRASS CALCULATOR¢ --------------------¢¢ by RON FETZER of OHAUG¢¢ If you bought a commercial calculator¢ with all these features it could cost¢ you a considerable amount of money.¢ This is a great calculator. If you do¢ Assembly Language programming this¢ calculator is a must. It does Hex to¢ Deci and Deci to Hex conversions.¢¢ It was called the GRASS CALCULATOR¢ because it was developed by the Grand¢ Rapids Atari System Supporters¢ (GRASS). The program was written by¢ GARY HEITZ and TIM FEENSTRA. The¢ '^Hex' function did not work. I¢ corrected it. I also clarified some¢ of the prompts on the screen.¢¢ This is a 10 digit calculator with¢ Hex to Deci. and Deci to Hex¢ function. In addition the memory¢ contents are displayed on the¢ calculator unlike a commercial¢ calculator. With the ability to¢ display numbers in SCIENTIFIC¢ NOTATION you can get answers that can¢ be 20 digit long or even longer.¢¢ SCIENTIFIC NOTATION. In this format¢ only the SIGNIFICANT digits are¢ displayed. The number of places to¢ move the decimal point is indicated¢ by a number with a + sign. For¢ example:¢¢ CALCULATOR SHOWS:¢¢ 2.334512 +12¢¢ This means that the decimal point¢ must be moved 12 places to the RIGHT¢ from its present position. The empty¢ spaces get filled in with 0. Thus the¢ number woud be:¢¢ 2 334512000000.¢ .----------->.¢¢ 2,334,512,000,000(2 trillion etc.)¢¢ FEATURES OF THE CALCULATOR. Repeat¢ the keystrokes as shown in the¢ examples. ^R means hold the CONTROL¢ KEY and press R.¢¢¢ ADDITION: 25 + 25 = ANS(50)¢¢ SUBTRACTION: 50 - 30 = ANS(20)¢¢ MULTIPLICATION: 25 X 4 = ANS(100)¢¢ DIVISION: 50 / 10 = ANS(5)¢¢ PERCENT: 90 X 6 % = ANS(5.4)¢¢ SQUARE ROOT: 64 ^R = ANS(8)¢¢ SQUARE OF A NUMBER: 7 ^S = ANS(49)¢¢ HEX TO DECI.: $FF ^D = ANS(255)¢¢ DECI TO HEX: 1000 ^H ^H = ANS($3E8).¢ (Press ^H TWICE!)¢¢ CHANGE SIGNS: T (TOGGLES) FROM +/-¢ AND -/+¢¢ GET 2 DECIMAL PALCES: # 2.345 + 3.569¢ = 5.92 (ROUNDED OFF TO NEAREST¢ HUNDREDTH)¢¢ PUT A NUMBER INTO MEMORY: 100 ^+¢¢ SUBTRACT A NUMBER OUT OF MEMORY: 25¢ ^-¢¢ FROM MEMORY TO MAIN DISPLAY: ^M¢¢ CLEAR MEMORY: ^C¢¢ CLEAR A CURRENT ENTRY: Z¢¢ CLEAR ALL (EXCEPT MEMORY): CLEAR or¢ RETURN¢¢ PRINT: P(TOGGLES ON/OFF) Printer¢¢ QUIT PROGRAM: ^Q¢¢¢ When a HEX number is put into the¢ memory it will automatically be¢ converted to a decimal number. (All¢ HEX numbers must be preceeded by¢ '$').¢¢ If you want to disable the BREAK KEY¢ remove the REM in line 1910.¢¢ You can renumber this program (TURBO¢ BASIC) to higher numbers such as¢ starting with 30000 and attach it to¢ another program. To do this do the¢ following:¢¢ 1) Renumber the program¢ 2) SAVE it with LIST. Example: LIST¢ "D:GRASSCAL.LIS"¢ 3) Type in NEW¢¢ 4) LOAD your original program into¢ the computer.¢ 5) LOAD your listed program with the¢ ENTER command. Example:ENTER¢ "D:GRASSCAL.LIS"¢ 6) Save your newly created program.¢¢ You now have attached the calculator¢ program to your original program. You¢ can call the claculator program with¢ a GOTO 30000. To return to your¢ original program change line 490 in¢ the calculator program from 490¢ .....:END to 490 ....:GOTO 10. Now¢ every time you press ^Q(Quit) you¢ will be going to the begining of your¢ original program.¢¢ MAKING A MASTER DISK: Format a disk¢ in single density. If you use TURBO¢ BASIC your calculator will be faster.¢ The new TURBO BASIC shows a prompt of¢ TURBO. The old shows a prompt of¢ READY. PUT DOS on your disk. Copy¢ TURBO BASIC(AUTORUN.SYS) to the disk.¢ From the Newsletter copy the program¢ GRASSCAL.ARB to your disk. If you¢ have the new TURBO BASIC on the disk¢ the program will be self booting. The¢ calculator program will run also¢ without TURBO BASIC.¢¢ You can order a complete master disk.¢ It is $4.00 including shipping. Order¢ from Ron Fetzer. See address below.¢¢ OL' HACKERS A.U.G. INC., C/O RON¢ FETZER, 22 MONACO AVE., ELMONT, NY¢ 11003, U.S.A.¢¢ >>>>>>>>>>>>>>>END<<<<<<<<<<<<<<<<<<<¢¢¢
