Remote Processing BASIC 52 - Manual (Page 62)

RPBASIC-52 PROGRAMMING GUIDE
2-43
GET
Syntax: A = GET
Function: Gets chara cter from buffer.
Mode: Run
Use: A = GET
Cards: All
D E S C R IP T I ON
GET is similar to INKEY$ in other Basic languages. GET returns the ASCII value of the character rather
than the string. This feature makes it useful when receiving binary information.
To rec eive a contro l-C va lue (3), s et bit 1, a ddress 26H.
DB Y(38 ) = DB Y(38 ) .OR . 1
This disables program breaks when a is received.
GET can extract cha racters from C OM 0 or COM 1. The UI 0 or U I 1 comm and is execute d to get characte rs
from an alterna te serial port.
The AS CII value 0 is a v alid numb er. Unfortunately, this va lue can indica te that there are no c haracters
available. If your applic ation program expects to rece ive ASC II 0's, the following program will wait until if
there are characters in the buffer to ensure a value of 0 is indeed valid.
100 IF COM(0) = 0 THEN 100
110 A = GET
Line 100 loops until there is a character in the buffer. Line 110 extracts the character from the buffer. When
A = 0, zero is the ASCII value.
RELATED
COM , COM $, INPUT , UI 1, UI 0
EXAMPLE
The fo llowin g progr am ta kes ch aracte rs one a t a tim e from the bu ffer and puts the m into expan ded m emo ry.
128K or more of RAM is needed.
100 IF COM(0) = 0 THEN 100
110 A=GET
120 POKEB 1,X,A
130 X=X+1
140 GOTO 100