Hi65 is a high-level Commodore 65 emulator that is much faster than MESS and even the original machine. This is because Hi65 does not implement a virtual version of the 4510 CPU, nor does it execute machine code software. Instead, it executes tokenized BASIC 10 programs directly. This makes the execution much faster and more accurate.

The high-level approach of Hi65 makes it 2840 times faster than MESS and 12000 times faster than a physical Commodore 65. Hi65 is released under the GPL license.

What’s new in version 9:
* Implemented the RND instruction, which initializes the pseudorandom number generator with the current timer value and returns a result if its parameter is zero, returns a new result with the current initialization if the parameter is positive, and initializes the pseudorandom number generator with its parameter if it’s negative. (NOTE: for now, the values of the pseudorandom numbers will not coincide with those generated on a physical C65, even though the effect of the instruction as described in the manual is reproduced to the letter, because the standard srand() and rand() functions of C are used, rather than the formula from the original BASIC 10.)
* Extended the default expression evaluator, to support negative numbers or variables as parameters for mathematical functions.
* Added checks in the Let, If, Input and Print functions to prevent the user from using variables called DO, FN, GO, IF, ON, OR, TO (which would be tokenized as commands and prevent the program from working).
* Fixed a bug in the Next function, which used to make it exit loops after a single iteration if a colon was present after the corresponding FOR instruction
* Extended the Dim function so that multiple arrays, separated by commas, can be declared with a single instruction.
* Fixed a bug in the function that transforms expressions into a format MuParser can understand, which used to work incorrectly with negative variables being multiplied, divided or elevated to power.
* Fixed a bug in the keyboard input routine, that used to make the character display sluggish on Windows 10.

UPDATE 9.1: Fixed a related bug, only apparent on Windows 10, that sometimes prevented the application to release the screen after quitting. Fixed the proportions in the alternative screen layouts (GOPET, GO20, GO16, GO64, GO128) and sped up their creation. Implemented font and color selection in the frontend.

Notify of
Inline Feedbacks
View all comments