Subject: Re: [stella] I'm Back From: "Roger Williams" <mer02@xxxxxxxxxxxxx> Date: Mon, 26 Jan 2004 18:09:59 -0600 |
About the last thing I did on this list before my life went to hell was to post a pretty long document laying out the strategy: http://www.biglist.com/lists/stella/archives/200111/msg00266.html The main points are 1) A library of standard kernals are available, selected with a statement like "screen" 2) User code runs asynchronously so users don't have to synchronize timing 3) 2 is accomplished by peppering the object code with tests like this: LDA #$FC ;[0]+2 AND INTIM ;[2]+3 BNE .+5 ;[5]+3 JSR Kernal Overhead most of the time will be 8 cycles (and use of the accumulator). This check clears the way for 250 cycles of code. During evaluation of a long expression a check might need to be done that preserves the accumulator, which would take a bit longer. It should be pretty simple for the compiler to insert these checks after optimization (at the token level) and before writing out code. Computers are pretty good about clock cycle counting :-) We had a lively discussion about this with many good ideas but everything went to hell before I had a chance to act on it. I still think it's do-able and am seriously tempted to try for a Proof of Concept. --Roger Williams ----- Original Message ----- From: Ben Larson <benjamin_e_larson@xxxxxxxxx> > I'd be interested in your ideas on compiler design for > the 2600. I was actually doing some investigation > into this as well a while back but everyone seems to > think it would be next to impossible to put together > anything useful. It would be an interesting exercise > in abstraction principles to say the least... ---------------------------------------------------------------------------------------------- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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