Remote-processing RPC-52 Manuel d'utilisateur télécharger pdf (Page 10)

SAVING PROGRAMS CHAPTER 3

Page 8

Figure 3-1 W3 autorun jumper

INTRODUCTION

Program s are stored in an EEPROM in socket U4. You

can store one program up to 32K bytes. A general rule

to determine program memory requirements is one line

requires 40 bytes. 32K bytes would store 800 lines of

code. Your application could be significantly more or

less, depending upon the number of commands/line,

comments, and pr int statements.

Despite the fact you may have a 128K or 512K RAM

installed, the maximum program size RPBASIC-52 can

run is about 60K (including room for variable storage).

Only one program can be stored on the EEPRO M, and

this is limited to about 32K.

An EEPROM is non-volatile (retaining data even when

power is disconnected), having an unlimited number of

read cycles and a limited number of write cycles (about

1,000). A program is not run fr om EEPROM . It is

transfer red to RAM and run from there. Prog ram s in

RAM can be modified. They can be saved to EEPROM

for auto execution later.

The RPC-52 can be set to autorun on power up or reset

by installing a jumper (W3). When autorun is on, the

program in E EPR OM is loaded into RA M and begins to

execute immediately.

The RPC -52 has two EEPR OMs. One is used for

program storage (U4). This is the one under discussion

in this chapter. T he other is a serial EEPROM used to

save various RPBASIC-52 and user parameters (U7).

The serial EEPROM is discussed in chapter 13.

This chapter discusses saving programs to EEPROM

(U4) and program autoexecution.

SAVING A PROGRAM

For this example, assume you wanted to save the

following program:

10 FOR N= 0 TO 2

20 PRINT "Hello ",

30 NEXT

40 PRINT

If this progr am is not alr eady in, type it in now (or , if

you prefer, use your own program).

Type in the following command:

SAVE

RPBASIC-52 responds with:

Saving 35 bytes

Verifying --- OK

The time it takes save a program depends upon the

length and complexity of the program. Program ming

rate is about 600 bytes/second. If the program does not

successfully save to the EE PROM, an err or message will

appear.

Saving a program overw rites the pr evious one. Ther e is

no way to recover the old one since both occupy the

same space.

AUTORUNNING

To autorun a program:

1. Make sure there is a program in EE PROM (from

above).

2. Install jumper W3.

If you push the reset button , the progr am should

autoexecute. If th ere ar e any errors, the program will

stop (assuming you have not trapped them with ON

ERROR) and display the error message.

PREVENTING AUTORUN

When troubleshooting a program, it' s not always

convenient for an autoexecute file to r un. This is

especially true if the program has been configured to

ignore the < ESC> or < Ctl-C> keys. To pr event

autorun, r emove jumper W3 before power up or reset.

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 EEPRO M. Use the LOAD command to transfer the

EEPROM 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.

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Remote-processing RPC-52 Manuel d'utilisateur Page 10

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