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Commands - 40

DPEEK and DPOKE

Memory Function and Statement

SYNTAX: n = DPEE K(address)

n = DPEE K (address, segment)

DPOKE address, data

DPOKE address, data, segm ent

PURPOSE: DPEEK returns a 16– bit value from memor y.

DPOKE writes a 16– bit value to memory.

REMARK S: A 16– bit word is form ed with the lower 8 bits as the value located at memory addr ess “address”

and the upper 8 bits as the value located at memory location “ address + 1”.

The first syntax applies to the first 64K of memory (segment 0). For addresses above segment 0, use

the second syntax. Not all cards support segmented mem ory.

DPEEK is an extension of PEEK and executes twice as fast as two PEEK functions. DP OKE is an

extension of POKE and executes twice as fast as two pokes.

RELATED: DPOKE, PEEK, FPEEK, PEEK$, POKE, FPOKE, POKE$

EXAMPLE: The following routine POKEs or writes two numbers into memory. The DPEEK statement allows

both to be retrieved and printed ( 256 x 3 + 45 = 813). You could also say DPOKE 2000, 813.

10 POKE &A000,45 : POKE &A001,3

20 PRINT DPEEK(&A000)

RUN

813

10 A=DPEEK(1000,2)

This retrieves data from address 1000 at segment 2.

ERROR: < Data negative> – for address and segment

< Data > 65,535> – for address

< Data out of range> – if segment > 15

1 2 ... 68 69 70 71 72 73 74 75 76 77 78 ... 207 208

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Remote-processing CAMBASIC Manuale Utente Pagina 73