HP 7470A Interfacing And Programming Manual page 141

Displayed current pen position and identification.
1000 1000 0 7470a
Apple II Applesoft BASICExample:
10 PRu 3: IN# 3
20 zs= "NT2" + CHR$ (25)
30 Y$= "RUE" + CHR$ <25)
40 PRINT zs; "PH1000,1000;UC;"
50 PRINT vs;
50 INPUT H,B,C
?0 PRINT vs;
so INPUT us
so PRINT zs; "D1"
100 PRINT vs;
110 INPUT H$
120 PRINT vs
130 INPUT D$
140 PRa 0: IN# 0
150 PRINT H,s,c,Hs
150 END
Displayed current pen position and identification.
1000 1000 0
7470A
For an explanation of PR# 3, Z$ and PR# 0, refer to the Apple II
example in the prior section. The string Y$ instructs the plotter at
address 5 to talk. The Apple II sends an untalk command after it re­
ceives a carriage return character. The plotter with an HP-IB interface
terminates all output with a carriage return followed by a line feed.
Therefore, in order to clear the plotter's buffer for future output, another
talk instruction and another input statement containing a dummy
variable (D$ in this program) must follow the input statement which
reads parameters of the plotter output statement. The additional talk
and input instructions will read the line feed character, thus clearing
the plotter's buffer.
HP-IB INTERFACING 9-13