[Coco] Coco Homebrew ROM Cartridge?
afra at aurigae.demon.co.uk
Sun Apr 19 14:04:15 EDT 2009
> Was wondering if it would be possible to get a Homebrew custom coco
> cartridge working. I know for the Atari home computer and consoles as
> well as the NES and SNES there are people who have created
> cartridges for these systems with multiple games on each cartridge,
> anywhere from 3 in 1 all the way up to 100 in 1 games on a single
> cartridge. Could you put multiple game roms with a menu on a single
Yep, I have done that with a large flashrom, and a CPLD to act as an
address latch, first bank of flash had the menu in it, and then further
banks had the cart code. My multi-cart could also handle .cas files
stored in the flash and would load them into RAM and execute them,
additionally it would re-tokenise between Dragon and CoCo depending on
the source cas file, and the machine it was running on.
I *MUST* make this design available at some point, if there's enough
interest I could put the designs (eagle) and code (6809 for the cart,
and freepascal for the programs to build the flashrom file) up, but be
warned that the documentation is minimal :)
> The reason I ask is I just saw the custom made cartridge board
> advertisement on the coco3.com home page and it got me curious
Not guilty, but a basic bankswitched cart isn't that hard to do, a
decoder off the address lines and a latch should do it, even simpler if
you don't need to use it at the same time as disk drives, as you can
just use P2/SCS to enable the latch at $FF40.
Phill Harvey-Smith, Programmer, Hardware hacker, and general eccentric !
"You can twist perceptions, but reality won't budge" -- Rush.
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