Hi Calc
Hi Calc
Publisher: CodeWorks - CursorGenre: [uncategorized]
Programmer: Glen Fisher
Year: 1971
Uploaded by: admin
Language: English
Downloads: 63
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We do not own the rights to any of the software
Game input holds PET matrix keys down until you physically release them, which is best for arcade games. Type input keeps the original short-tap queue for entering BASIC commands.
Charset Auto lets PET software switch normally. Graphics or Business forces the selected character ROM for compatibility/testing.
Changing RAM or ROM resets the PET. Some programs need ROM2/ROM4 or 16K/32K.
The sound slider controls the emulated PET VIA speaker. Modern browsers require a click before audio can start, so Start Game also enables audio.
The emulator has an IEEE-488 device at address 8 for loading/saving .prg files.
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Game Notes
HI CALC is a high-precision calculator that can handle 120 significant figures on an 8K PET, and 684 on a 16K PET. I played around with this one for a little while, and I'm impressed. The program streamlines its internal representation of numbers by storing them in "base 1000" (essentially 3-digit chunks). I tried multiplying two reasonably long numbers, equivalent to 2^64 * 2^128 (see screenshot), and verified that the answer was correct with WolframAlpha. The PET came back with this 58-digit answer pretty quickly, too. These days, we have modern tools available for this kind of calculation, but this program's still fun to play around with for a bit. It might even be worth studying how the program is put together for anyone interested in low-level arithmetic algorithms.
