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QPI for the HP-42S



#8

This is just a short note to tell that I have just uploaded the latest version of QPI for the HP-42S at the following URL:

http://w1.322.telia.com/~u32220482/qpi42s.html

Best regards,
Erik Ehrling (Sweden)


#9

Where did you get the font you used for the program listing?

Regards, Juergen


#10

Hi Juergen!

The listing is just made up of a series of screen-shots from Emu42 (so in a sense the underlying font is the real HP-42S font, although it is not made using a font per se), however if anyone could recommend a good program to construct a font from bitmaps it would not be much work to convert it into a real font.

Best regards!
/Erik

#11

Look in here for some nice fonts produced by Luiz:

http://www.hpmuseum.org/cgi-sys/cgiwrap/hpmuseum/articles.cgi?read=286

#12

Lines 381 and 383 should not be there; they cannot be correct. 

RCL "T_QPI"
RCL "Z_QPI"
RCL "Y_QPI"
RCL "X_QPI"

fills the stack

Cheers, Werner


#13

Hi Werner!

Certainly the lines should be there! The lines 2-12 at the start of the program stores the contents of the stack (and all registers). The corresponding lines 376-391 at the end of the program restores the stack (and all registers). This way program encapsulation is achieved on the HP-42S! Further, this allows you to run QPI in the middle of a calculation and then continue the calculation after QPI has run!

Best regards,
Erik Ehrling (Sweden)


#14

No, Werner is right, I've noticed this too. The lines 381 and 383 are too much. Consider: If you do

RCL "T_QPI"
STO ST_T

you will restore the saved T register contents directly to T. But if you now execute

RCL "Z_QPI"

the stack is lifted and the contents of T are lost. Instead you should just do

RCL "T_QPI"
RCL "Z_QPI"
RCL "Y_QPI"
RCL "X_QPI"

as Werner suggests, and the entire stack will be restored.

Cheers, Victor


#15

Oh yes! The lines are redundant (even though the program works perfectly with the lines in place as well...). Thanks!

Regards,
Erik


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