Subject: Re: [stella] Strange RIOT(?) register writes in Star Ship?!? From: Thomas Jentzsch <tjentzsch@xxxxxx> Date: Fri, 30 Aug 2002 09:13:00 +0200 |
Eckhard Stolberg wrote: >There are three unused bits in SWCHB. If you set these to output >you can read back whatever you write to SWCHB. So you could consider >them as three bits more RAM, if you will. In the upper example it >seems that the state of "gameOffBool" is stored in bit D4 of SWCHB. >I suppose it's used to check if the game is off at the same time >as the RESET or SELECT switches are checked. Wow, *three* more bits free to use! That's ~0.3% more RAM! :-) Are there any more bits that can be used? ---------------------------------------------------------------------------------------------- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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