Remote-processing RPC-52 Manuel d'utilisateur télécharger pdf (Page 17)

CHAPTER 5 RAM MEMORY

Page 15

sets disagree, then you must take action appropr iate to

the situation.

Another technique to ch eck for valid mem ory is

checksums. Simply writing a program to add the values

in RAM and compare it against a number is a good

check. However, you cannot tell which data element

was corrupted.

Instances of data corruption are rar e. T hey do increase

as the board power is cycled or reset. You should be

aware that data corruption is not impossible and there are

methods to detect and correc t it.

ASSEMBLY LANGUAGE INTERFACE

Assembly language programs must be placed in the

RPBASIC -52 EPROM. Progr ams should start at addr ess

6000H or higher up to 7FFFH.

Docum ented assem bly language interface calls listed in

the Intel MCS BASIC-52 Users Manual may work with

RPBASIC-52. This is because RPBASIC-52 has been

reassembled and code has been shifted around.

COMMANDS

The following is a list of RPBASIC-52 commands used

with RAM.

Command Function

CALL Calls an assembly language routine

CBY Returns code memor y data

DBY Returns or assigns internal memory

MTOP Sets top of RAM memory

PEEK B Returns a byte

PEEK W Returns a 16 bit value

PEEK $ Returns a string

POKE B Stores a byte

POKE W Stores a 16 bit value

POKE $ Stores a string

XBY Returns or assigns external memory

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Remote-processing RPC-52 Manuel d'utilisateur Page 17