Remote-processing CAMBASIC Manual do Utilizador descarregar pdf (Página 7)

Concepts - 1

Getting Started

To program in CAMBASIC you will need a terminal to interface with your CPU card. This may be a CRT terminal or a

PC configured as a terminal. If you use the PC, you will need additional software for your PC to communicate.

SmartLINK

turns your P C into a progr am developm ent workstation. See your har dware m anual for setup instructions.

You should review the CAM BASIC comm ands in Chapter 4 of this manual. Don’t be overwhelmed by the number of

comm ands available. M ost progr ams use only a limited number of comm ands. You will find that most com mands in

CAMBASIC are familiar to you if you have ever programmed in any basic before.

On power– up a message is printed like that below. If a nonsense message appears, your terminal is not set at 19,200

baud, one start bit, 8 data bits, one stop bit and no parity. The am ount of free mem ory is product dependent.

CAMBASIC (TM) Version 1.00

> _

The underline ( _ ) shown to the right of the “> ” prompt represents the cursor position. Y our cursor m ay be a block or

other character depending upon your system.

This mode is useful for debugging and for using CAMBASIC as a calculator for quick computation s. V irtually all

statements and commands may be used in this mode. Memory may be read and modified. Data may be sent to or read

from por ts.

The Progr am Mode is used for entering programs. Program lines are always preceded by line numbers. Execution begins

after RUN is entered. The pr ogram may be run as many times as desired. You can enter a program in either upper or

lower case.

Line Format

Every program begins with a line number. Line numbers may range from 1 to 65529.

Program s are stor ed and run in RAM , in line number order, regardless of the entr y sequence. P rograms ar e compile d into

an intermediate code to speed execution. The average com piled program will use about 10% more memory than the

keystrokes you typed or disk memory used. This number can vary 20% either way, depending upon the type of program

you are writing.

A compiler limits a program line to 159 characters. More than one statement may reside on a line as long as the

statements are separated by colons (:). Putting more than one statement on a line will cause somewhat faster program

execution and use less memory.

Line Renumbering

CAM BASIC can renum ber your progr am. Typing in RENUM will automatically renumber your program in line steps of

10 beginning with line 10. You can optionally specify the starting line number and step value. Refer to the RENUM

command.

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