Subject: Re: [stella] optimization : sneaky fractional bit repr From: <kurt.woloch@xxxxxxxxx> Date: Mon, 18 May 1998 10:11:34 +0200 |
Andrew Davie wrote: >Here's an old favourite of mine. >RAM is pretty tight on the 2600, this one could come in handy for those with >really really tight space problems. Its a way of using, say, 2 and a HALF >bits to represent a particular datum. That is, you don't have to use a >whole number of bits. Aaarrgh... did you use that in a program too? I think it would be very cycle-consuming to do this. >I came up with this idea on the C64 back in 86 or so, when space was real >tight. Come on, on the C-64, it couldn't have been THAT tight! Except, maybe, if you used it for packing playfield levels? And from David: >Hmmm... Yes, I've done this sort of thing when writing adventure games for >the Casio PB-100 (trying to cram everything into 1.5KB), although the >advantage there was that space was the problem, and *not* time. Trying to >perform a division in limited time is a real pain, whereas shifting bits >always takes the same amount of time. Uh... that reminds me of my "Mario & Yoshi" port I did on the Sharp PC-E220 - in Basic. I think it still lurks around in its memory. I renamed it to "Mario & Willi" - two people at the Karaoke Club who couldn't stand each other. >I've tried to push playfield graphics hard with my platform game - Droid - >which you probably won't have seen because I haven't posted a version since >you joined the list (RSN though!). I'm going to tidy up the source code so >I can post the next version with full source - and I'd welcome your views >and comments! In case you didn't notice, all files since the start of the list are stored at the Stella Archives at http://www.biglist.com/lists/stella/archives/. You can search for them there - if you got full Internet access, not only E-mail, that is. With love (and my PC-E220 still in the bag) Kurt Woloch -- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/stella.html
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