Subject: Re: [stella] Zero-Page Memory Addressing.. (Still a newbie, but getting there.) From: "Joel Park" <joelp@xxxxxxxxxxxxxxxxxx> Date: Fri, 2 Nov 2001 10:13:52 -0500 |
Thank you for the Answers. You totally confirmed any assumptions I may have had. It really helps to picture Stella as a whole. I've got to say that I'm getting excited about this stuff. I'm a Visual Basic Programmer by profession, it's fantastic to find something I can do that is so far from programming Visual Basic. Thanks again for all your help, y'all never let me down. ----- Original Message ----- From: "Manuel Polik" <cybergoth@xxxxxxxx> To: <stella@xxxxxxxxxxx> Sent: Friday, November 02, 2001 8:05 AM Subject: Re: [stella] Zero-Page Memory Addressing.. (Still a newbie, but getting there.) > HiJoel! > > >to me now... Absolute Addressing is 1 click slower > right? > > Depending on what you're doing, in most cases: yes! > > >My question is about Zero-Page Addressing. Any thing > in zero-page is > >accessed with single bytes, that's easy. But where is > this Zero-Page stuff > >located?? > > It is, as the name indicates the first page, i.e. the > bytes from $00 to $FF (or from $0000 to $00FF to be more > precise) > > > Is it allready built into the Atari somewhere, instead > of on the > >cart?? > > Yup! > > > What is the size of the Zero-Page I've seen variables > > defined > > usually set in the &80 range.. > > The zero page is splitted in two equal parts. > > The first from $00 - $7F is where the TIA registers are > located. (Check out VCS.H to find out where is which.) > > The second half is the famous 128 byte RAM. As you > already found out, it's ranging from $80 - $FF. > > So all RAM access is actually in the zeropage, which > means there's very fast access here. (Any serious C64 > coder would sell his grandma for 128 Bytes free zeropage > RAM, BTW :-)) > > >Thanks, > > HTH > > > I'm sorry again if this is a total repeat. > > Uhm, well... :-) > > Greetings, > Manuel > > -------------------------------------------------------------------------- -------------------- > Archives (includes files) at http://www.biglist.com/lists/stella/archives/ > Unsub & more at http://www.biglist.com/lists/stella/ > ---------------------------------------------------------------------------------------------- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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