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SAVING PROGRAMS CHAPTER 3

Page 10 RPC-30

Figure 3-1 Autorun jumper

INTRODUCTION

Program s are stored in EEPROM in socket U8. 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 comm ands/line, comments, and pr int

statements.

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

installed, the maximum program size CAMBASIC can

run is about 28K (leaving room for variable storage).

Only one program can be stored on the EEPROM.

Program s cannot be chained.

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

10,000). A prog ram is not run fr om EEPR OM. It is

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

RAM are run and can be modified. They can be saved

to EEPROM for auto execution later.

The RPC-30 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 -30 has two EEPR OMs. One is used for

program stor age. This is the one under disc ussion in this

chapter. The other is a serial EEPRO M used to save

various C AMBASIC and user param eters and is

discussed in Chapter 13.

The EEP ROM is write-protected with 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 the serial EEPROM or RA M, which is

battery backed.

SAVING A PROGRAM

To save a program in EEPROM, the autorun jumper W3

must be installed. Also, you need a program to save.

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

EEPROM , 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 EEPRO M. If the program does not write to the

EEPROM, 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 EE PROM (from

above).

2. Make sure the autorun jumper W3 is 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

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 37 38

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