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SAVING PROGRAMS CHAPTER 3

Page 8 RPC-150

Figure 3-1 Autorun jumper

INTRODUCTION

Programs are stored in socket U3. An optional real time

clock module, a DS-1216EM may also be installed in

U3. See Chapter 7 for calendar/clock installation and

operation.

You can store one program up to a maximum size of

about 28K bytes. A general rule to determine program

storage requirements is one line requires 40 bytes. 28K

bytes would store over 700 lines of code. Your

application could be significantly more or less,

depending upon the number of commands / line,

comments, and print statements. Another indication of

program size is to use the file length as saved on a PC

disk.

An EPROM is non-volatile flash type technology, having

an unlimited number of read cycles and a limited number

of write cycles (about 10,000). A program is not run

from EP ROM . It is transferred to RAM and run from

there. Programs in RAM are run and can be modified.

They can be saved to EPROM for auto execution later.

The RPC-150 can be set to autorun on power up or reset

by installing jumper (W1[17-18]). When autorun is on,

the program in EP ROM is loaded into RAM and begins

to execute immediately.

The EP ROM is write-protected w ith a software lock, so

accidental writes on pow er-on or -off are almost

impossible. You cannot disable the lock except when

executing the SAVE command. T o save param eters,

you must use battery backed RAM and save data to U1.

SAVING A PROGRAM

To save a program , set jumper W 1[3-4] and [17-18].

You may set the jumper even if the power is on.

Remember to discharge any static electricity before

installing or removing the jumper. 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

CAM BASIC will compile the program , progr am the

EPROM, and verify its contents.

Compile...Write...Verify

The time it takes to do all of this depends upon the

length and complexity of the progr am. Gener ally, it w ill

be from 1 to 20 seconds. The ready prom pt (> ) will

appear when the program has been successfully saved to

the EPROM . If the program does not write to the

EPROM, an error message will appear:

<Fail @ xxxx

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

no way to recover it since both occupy the same space.

AUTORUNNING

To autorun a program:

1. Make sure there is a program in EP ROM (from

above).

2. Make sure jumper W1 [3-4] and [17-18] are

installed.

If you push the reset button, the progr am should

autoexecute. If there are 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

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