ROM hot swapping

[Ryan Roth]

I figured I should share more of the things I am working on.

I was working on porting Adventure to my PAL-1, but due to the size of all the data, I got stuck. My workaround was to burn it to a ROM. Being it was too big for the 32K ROM, I burned it to a 64K ROM, and added a boot loader that copies the lower 32K of the ROM to RAM, prompts you to switch to the upper 32K of the ROM, and then jumps to the program there :)

https://youtu.be/7aGCk6aiKZ0

[Hans Otten]

That looks impressive! How did you port this from where?

[Ryan Roth]

"Porting" was being generous. I grabbed a copy of the Fortran source, copied all the text strings from it, and then with a game map and the original source, I implemented it in 6502 asm. It is incomplete, as I lost momentum. Also, I made a typo in my first post, should have been upper/lower 16K of the 32K ROM, not 64K ROM. I attached a copy of the ROM image if anyone wants to mess with it.

[Neil Andretti]

Hi Andre,

Don't hide your light under a bushel! This is a veryimplressive use of the RAM / ROM. Congrats.

I've already build a 48K ROM Card, so I would be happy to see the sources on github ;)

Nils

[Ryan Roth]

Here is a link to the code https://github.com/ryaneroth/Adventure
It has some of the original Pascal files in there too.  This is my first real project in assembly, so it may be ugly :)

[GN L]

Thanks for sharing another impressive job ;)

Liu

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