Remote-processing RPC-210 Manuel d'utilisateur télécharger pdf (Page 15)

SAVING CODE AND DATA BASIC SECTION 3

Page 3-2

WARNING:

Be careful using the BSAVE command. RPBASIC

resides at addresses 0.7000H, segment 0. If you

overwrite any portion of this area, RPBASIC-52

may operate er ratically. You can sa fely write data

and assembly language code from 7000H to FFFFH,

in segment 0.

Linking Programs

EXECUTE loads and runs the program in the program

specified by SAVE. The range for EXECUTE and

SAVE is 1 to 7 on the RPC-210 card.

Make the following modifications to the above program

to see how one program can call another.

Add the following lines:

10 PRINT "Program segment 1"

60 EXECUTE 2

Now type:

SAVE 2

Modify lines 10 and 60 as follows:

10 PRINT "Program segment 2"

60 EXECUTE 1

Now type:

SAVE or SAVE 1

(Typing SAVE is the same as typing SAVE 1).

To see the programs operate, type RUN. To stop

program execution, press < Ctrl-C> .

You may notice there is a slight pause between the

printed hello' s and program segment number . T his is

the time it takes to clear memory and load the program.

Loading and clearing take appr oximately 0.25 seconds in

a very small program and several seconds in a very large

program.

When linking programs, RPBASIC-52 var iables are not

preser ved. Data m ust be saved to R AM in segmen t 1

before executing a program and restored by the new

program.

Demo programs EXEC1. BAS through EXEC7.BAS,

when saved to EPROM, call one another randomly and

print out the number of times each program was called.

These program s are in the BASIC52 directory.

AUTORUNNING

To autor un a prog ram, br ing J7-17 to ground(J7-15 is

ground). P ush the reset button. The pr ogram , if any, in

EPROM segment 1 will run. If there are any error s, the

program will stop (assuming you have not trapped them

with ON ERROR) and display the error message.

Converse, to prevent autorun, remove the ground from

J7-17. You can still load/modify/run the program by

first executing LOAD. See below.

LOADING A PROGRAM

There are tim es when y ou may w ish to tempor arily

modify or otherwise test out a change to a program.

Since the program is loaded into RAM in autorun,

modifications can be made without affecting the program

in EPROM. Use the LOAD or LOAD n command to

transfer the EPROM program to RAM.

If you find out that modifications are not desirable or did

not work, you can restore the original program to RAM

using the LOAD command.

HIDING A PROGRAM

You can hide programs using the HIDE comm and.

Simply typing in this command in the immediate mode

or as part of command line hides code. You will not be

able to list it.

WARNING:

HIDE IS VIRTUALLY IRREVERSIBLE.

ONCE EXECUTED, YOU CAN NOT

‘UNDO’ A HIDE.

To further protect your pr ogram, put HIDE as one of the

first lines of your code. Once executed or found by the

LIST command, it will not list the rest of the program.

You can clear out a program using NEW and download

a new one. However, the flags used to indicate a hidden

program are still active and this new program cannot be

listed.

HIDE should be the very last change during program

development.

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Remote-processing RPC-210 Manuel d'utilisateur Page 15

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