HP-97 Emulator

[teenix]

(01-17-2017 04:15 PM)Harald Wrote:  

(01-17-2017 02:13 PM)John Keith Wrote:  What a cool blast from the past! The sound effects are great, and I especially like that the "print roll" can actually be printed with the authentic dot matrix font.

I have found a small bug related to printing: when the factorial function is executed, the printer prints "NK" rather than "N!". I don't have a working physical 97 so I don't know whether this bug is present in the real 97 or just the emulator.

Thanks for a really neat program!
John

I suspect that is a "bug" in the printer font.

Hi Guys,

Your welcome

That was indeed the case. I suspect that the PIK chips used in calculator models that use them have slightly different ROM masks for the character sets.

The "K" character is not used for printing in the HP-97, so I replaced that printer code with a bold "!" character. I created a new print character data file specially for the HP-97 download.

I also noticed that the lower case "i" is also printed in a bolder font for the HP-97 and HP-19C, so I replaced that character too.

The print head sound effect had some "ticks" in it which I think is a worn print mechanism from the calculator it came from, so I smoothed it out.

The display was also supposed to blank when using the paper feed button, so that was modified also.

New uploads available.

cheers

Tony