Remote-processing BASIC 52 Manual de usuario descargar pdf (Pagina 74)

RPBASIC-52 PROGRAMMING GUIDE

2-55

LINEB (Function)

Syntax: A = LINEB(i/o bank,add ress)

Where: i/o bank = 0 to 7. Specific functions are card de pendent. Refer to your hardware manual.

address = device dependent. Usually it is 0 to 3.

Function: Reads a byte from an I/O device.

Mode: Command, Run

Use: A = LINEB(3,0) Reads port A of 8255 at digital port.

Cards: All. i/o bank is unique to each card.

DESCRIPTION

This function is equivalent to INP in other BASICs. Data is read 8 bits at a time in contrast to other LINE

functions which return 1 bit at a time. The i/o bank selects a particular I/O device listed in your hardware

manual.

Use this command to read devices and obtain data not otherwise available using RPBASIC-52.

LINE, LINE# (function), LINE, LINE#, LINEB (statement), CONFIG LINE

ERROR

BAD ARGUMENT i/o bank > 7

EXAMPLE

The following example reads all 8 lines at port A on the digital I/O port.

100 A = LINEB(3,0)

1 2 ... 69 70 71 72 73 74 75 76 77 78 79 ... 162 163

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Remote-processing BASIC 52 Manual de usuario Pagina 74