Remote-processing BASIC 52 Uživatelský manuál stáhnout pdf (Strana 103)

RPBASIC-52 PROGRAMMING GUIDE

2-84

POKEF

Syntax: POKEF segmen t,address,d ata

Where: segment = 0 to 7, specifies the 64K segment

address = 0 to 65535, location in segment to save to

data = +/- 1E-127 to +/- 0.99999999E+127, number to save to RAM

Function: Writes a floating point number to RAM.

Mode: Command, Run

Use: POKE F1,AD,DA

Cards: All

DESCRIPTION

Use POKEF to w rite floating point num bers into RAM. Program "constants" such as calibration tables are

saved to batte ry backed RAM .

WARNING: RPBASIC-52 does not check the address. It is possible to poke into the program, stack, or

variable areas. Results are unpredictable. Poke into mem ory above MT OP for safest

operation.

Each floating point number requires 6 bytes of R AM. W hen storing to RAM, separate addresses by at least 6

bytes. address is the starting address in RAM. Data is written to from address to address + 6. For exam ple, if

the first address was 0, the next is 6, third 12, and so on. An easy way to calculate an address is to use an

index number and multiply it by 6. By adding a constant, different sections of RAM may be used. See the

POKEB command for segment and address information.

PEEKF

ERRORS

BAD SYNTAX If W, segmen t, address, or data is missing.

BAD DATA If segment is > 7, address or data > 65535 or negative

EXAMPLES

The following example takes data from an analog input, multiplies it by a con stant, and saves it to seg ment 1

of the 128K RAM.

1000 FOR N = 0 TO 7

1010 POKE F1,N*6+100,AIN(N)*1.2383

1020 NEXT

The equation "N*6" is an index multiplier.

The next example prints out the data from RAM.

500 FOR N = 0 TO 7

510 PRINT PEEKF(1,120+N*6)

520 NEXT

The expression "120+N *6" performs two functions. First, 120 is a fixed offset into RA M. This offset is

necessary when allocating sections of RAM for storage parameters (strings, byte data, and other floating point

numbers). "N*6" indexes the floating point number into RAM so it does not overwrite other valid numbers.

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Remote-processing BASIC 52 Uživatelský manuál Strana 103