Remote-processing BASIC 52 Uživatelský manuál stáhnout pdf (Strana 128)

RPBASIC-52 PROGRAMMING GUIDE

2-109

ST@

Syntax: ST@ expr

Where: expr = 0 to 65535

Function: Takes a floating-point number from the argument stack and stores it to data mem ory at the address.

Mode: Command, run

Use: PUSH B : ST@7E00

Cards: All

DESCRIPTION

ST@ is used in conjunction with PUSH, POP, and LD@ . Use these commands to save and retrieve floating

point numbers to program RAM.

NOTE: LD@ and ST@ cannot use extended RA M. Only se gment 0 R AM (used for running B asic

programs) is used. Use PEEK and POKE com mands to access this memory.

WARNING: When 128 K and 512K RAM are installed, all of m emo ry is cleared on pow er up and rese t.

Do not use LD@ or ST@ to save floating point numbers in segment 0. Use POKE and

PEEK type comm ands instead.

32K RAM systems have address 7E00H set as M TOP. T his location up to 7FFFH m ay be used to store

variables.

expr is the ad dress in RAM of w here a number is sto red.

Each floating-poin t number requires six bytes of memo ry. expr in the ST@ and LD@ instructions specify the

high address. A number is stored at locations expr through expr-6.

LD@, PUSH, POP

ERROR

expr location should be above MTOP. Otherwise the data may be overwritten.

EXAMPLE

100 A=AIN(0)*.234

110 PUSH A

120 ST@7F00H

300 LD@7F00H

310 POP B

320 PRINT "Analog value retrieved=",B

>run

Analog value retrieved=",B

1 2 ... 123 124 125 126 127 128 129 130 131 132 133 ... 162 163

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Remote-processing BASIC 52 Uživatelský manuál Strana 128