Remote-processing CAMBASIC Uživatelský manuál stáhnout pdf (Strana 161)

Commands - 128

SYS

System Function

SYNTAX: a = SYS(n)

PURPOSE: To access system data and addresses.

REMARK S: n is the system number.

The following is a list of system information returned using this function:

n Function

0 Program size

1 Last address of array variables

2 Bottom of stack

3 Interrupt table addr ess

4 COM 1 output spool count

5 COM 2 output spool count

6 COM1 error flag

7 COM2 error flag

8 Keypad string table address

9 COM 1 input character count

10 COM 2 input character count

11 Buffer full flag for COM1 port

12 Buffer full flag for COM2 port

13 Display row

14 Display column

15 Sparkle flag address (RPC-2350G only)

The SYS function lets you access internal variables within the operating system. In most cases, you

will not need to use this function.

If you need to find memory that is not used by CAMBASIC , you can use all the addresses from the

address returned from SYS(1) up to the address returned by SYS(2). Since the stack moves

downward, it is recommended that you stay at least 300 bytes below the address given by SYS(2).

If you execute: PRINT SYS(2)–SYS(1)

in the Immediate Mode, the result will be the amount of remaining RAM.

SYS(1) indicates the last address used by arrays. A rrays sit on top of " regular" numeric variables,

which in turn are on top of your program.

SYS(2) r eturns the bottom of the system stack, w hich is below the string stack. Be sure to exec ute

this command after using CLEAR n.

1 2 ... 156 157 158 159 160 161 162 163 164 165 166 ... 207 208

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Remote-processing CAMBASIC Uživatelský manuál Strana 161