Subject: RE: [stella] Dumping ROM images From: "Lee Fastenau" <stella@xxxxxxxxxxxxxxx> Date: Fri, 11 Mar 2005 09:36:57 -0500 |
> I briefly experiminted with this sort of thing. Although I was trying to > dump the binary using sound, which was dumb because I could never get the > sound timing right and it certainly wouldn't fit in 128 bytes of RAM. > > http://www.biglist.com/lists/stella/archives/200402/msg00041.html > > Brief summary: It could work, but sometimes the RAM program would loose > control when a cartridge was removed or inserted. And I was afraid there > might be a slight chance of damaging the cartridge if the connection to +5 > V > were established before the connection to ground was established. (As was > mentioned in one of the replies to my original post). > > Dusty I wonder if certain console models are more prone to these problems than others. I didn't experience weirdness on my four-switcher with the small test program I wrote... but then I wouldn't consider those tests to be at all scientific. The +5 volt thing is a bit scary. Depending on where that pin is, maybe inserting a cart slightly crooked would help... Just to ensure ground connects first. I'll keep playing with it. (I won't mind too much if I zap a cart or two.) There's also potential for this type of code to be used for creating game cheats... But the execution code would have to be microscopic, probably something like: checkRom lda someRomAddress ; Poll some non-zero value in ROM beq checkRom ; If zero, loop jmp romEntryPoint ; Else, jump into game But I'm not sure what affect accessing a ROM address will have when there's no cartridge present. -Lee Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://stella.biglist.com
Current Thread |
---|
|
<- Previous | Index | Next -> |
---|---|---|
RE: [stella] Dumping ROM images, Lee Fastenau | Thread | Re: [stella] Dumping ROM images, Adam Wozniak |
RE: [stella] Dumping ROM images, Lee Fastenau | Date | [stella] Cosmic Ark scanline pixel , Adam Wozniak |
Month |