HP-71B IMAGE and PRINT USING

[Garth Wilson]

Thanks. I should have mentioned that it sends the printer the 500Hz V3= and then seems to choke on the ,SDD.D, . I'm having trouble understanding when the commas are needed and when they're not. In the middle of page 146 of the reference manual, there's the example, 100 IMAGE DDD" dollars and "DD" cents.",2XK"day" .

Regarding the CHR$(248), I originally had deg in there rather than the degree symbol (and it didn't work then either) but I replaced it with what I posted above. It is confusing with the double quote marks in the image string itself and the single quote marks used in the process of forming I$ which contains the image. The ' (single quote) at the beginning ends the section that started with I$=' ... IOW, these are bracketing the parts before and after the &CHR$(248)& , not the degree-symbol portion. That's might be most clear at the end of the first line with the &'",4X,' (Note the single quote followed immediately by the double quote. The complementary double quote is later in the I$ as it continues getting formed on the next line.)

Your suggestion for the B option does look easier though. I'll try that.

I totally forgot about the math pac's C(,) addition to the image capabilities, for complex numbers. That is no doubt where I got what I had in the original form of the program. It's on the bottom of page 22 of the math pac manual. I had wondered why I had that in there, and I removed it.