Remote-processing RPC-330 Manual de usuario descargar pdf (Pagina 11)

SAVING PROGRAMS SECTION 3

Page 3-1 RPC-330

Figure 3-1 W3 autorun jumper

INTRODUCTION

Program s are stored in an EPROM in socket U6. You

can store one or more programs, depending upon

EPROM size. One BASIC program can call another

when a 512K byte EPRO M is used.

Maximum program size that can be run at any one time

is about 62K, not including space for variables. 32K

bytes is the maximum program size when a 29C256 IC

type is used to save a program.

A conservative rule to determine program memory

requirements is one line requires 40 bytes. 32K bytes

would stor e 800 lines of code. Your application could

be significantly more or less, depending upon the

number of comm ands/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 at one time is about 60K (including room for some

variable storage). The table below shows the maximum

capacity, maximum number of program lines, program

size at one time, and number of programs for an

EPROM type.

EPROM Max Prog Max No.

type Cap. lines Bytes Progs

29C256 30K 400 32K 1

29C040 509K 12400 62K 8

One program can call another using the EXECUTE n

command. n is from 0 to 7, depending upon the

EPROM type.

NOTE: When a program calls another, the old program

is completely replaced. All variables and

arrays are cleared (set to 0).

To keep variables, you m ust save them before calling the

new progr am. When the new program is running, these

variables may be restor ed. Use P EEK and PO KE to

read and save numbers and strings. See SECTION 5,

STORING VARIABLES IN RAM for more inform ation.

Binary data is saved and read from the EPROM using

BSAVE and BLOAD commands. The EPROM has a

limited number of write cycles (about 1000), so writing

information should be kept to a minimum.

A flash EPROM 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 from

EPROM . It is transferred to RAM and run from there.

Programs in RAM can be modified. They can be saved

to EPROM for auto execution later.

The RPC-330 can be set to autorun on power up or reset

by removing jumper (W9). W hen autorun is on, the

program in EPROM segment 0 is loaded into RAM and

begins to execute immediately.

This section discusses saving programs to EP ROM (U6)

and program autoexecution.

SAVING A PROGRAM

For this example, assume you wanted to save the

following program:

20 FOR N= 0 TO 2

30 PRINT "Hello ",

40 NEXT

50 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

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 47 48

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Remote-processing RPC-330 Manual de usuario Pagina 11

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