Subject: RE: [stella] More complicated differences between 6502 and 6507? From: Oliver Achten <achten@xxxxxx> Date: Mon, 15 Oct 2001 00:12:36 +0200 (MEST) |
> > I still remeber when I discovered this when writing my 2600 emulator many > years ago. Has anyone ever looked at that section of code to see why SBC > $0F > is used? Did the programmer do this knowing it would return #$0F or was > this > an error of some sort? > > Dan Looks like the programmer had some sort of weird luck. He probably wanted to do a SBC #$09, but made a typing error in his code. (Un?) fortunately, this had the same result than doing a SBC #$09, so the error kept being undiscovered. Patching the ROM makes it run perfectly on my hardware, so i will include an auto patch feature into the BIOS. Best Regards Oliver -- GMX - Die Kommunikationsplattform im Internet. http://www.gmx.net - Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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