http://callanbrown.com/index.php?op...tars&catid=36:home-console-projects&Itemid=61 Simple and totally awesome.
Interesting idea - bit of a shame that he couldn't implement Mario 1 without some uber-hack, but hey - it's still good work.
It'd actually be really easy to hack Mario 1 for it. PRG can be rearranged so that memory ends up in the right place, but unfortunately CHR banks and mirroring need initialization so it'd take finding maybe 30 free bytes of ROM. Hell, the same '161 can be used as a parallel register for a multicart with a menu (which would also work on a Famicom unlike this).
Hey guys, Traced back to this post from my website stats haha. Glad you guys like the multicart. It's a neat little addition to my repro collection. If anyone gets a chance to MMC3-ify SMB please let me know!
its a very impressive cart you made, i have a mega drive multicart that works on the same reset principle, would love to see you do ones for different systems, might pick your brains in the future
I saw on a french forum that someone was trying to do this with another console (SMS) after seeing my tutorial, and even wired it all up but didn't think about how to trigger the clock on the '161 haha, so they always get the same game. I think their idea was that the on/off switch would do it, but of course each time they power it off the '161 resets. So the idea I've been mulling over is putting in a watch battery to power the '161, the outputs of the '161 would drive some transistors to the high address lines. Then the power off/on would also drive a transistor that provides the clock signal to the chip. I think I have a spare SMS cart sitting around so maybe I'll tackle that tonight to see if it works.
I can relate to the French as my electronics skills are superb for what they are but I'm limited in knowledge and experience when it comes to anything more advanced than a handful of PICs and MAX232s. I've got a couple game duplicates around here (Hang-On/Safari Hunt, whooo!) that I could try this with. Though I'm not sure what games I'd actually want a multi-cart for, a few reproductions of games that came out with terrible English translations sure. Not like the SMS had many games with multiple sequels. Be interesting to try this with a Genesis, Streets of Rage 1/2/3 on a single cart would be cool.
I was thinking a sonic multicart but the roms looks pretty big, all 256 or 512 KB each, I'd have to stack the ROMs to get enough space.
