Subject: Re: [stella] Atari memory From: Thomas Boutell <boutell@xxxxxxxxxxx> Date: Tue, 1 Mar 2005 13:39:42 -0500 |
On Tue, 1 Mar 2005, Paul Slocum wrote: > >> No, but it does have 64K of address space. > > if it were a 6502, but the 6507 can only address 8K (only 13 address > lines). So the top 3 MSBs of the address are ignored on the 2600 (which > effectively creates a mirror every 8K). > > so if you're ever REALLY short on memory and are using pointers in RAM, you > can use those top 3 bits for something. ;o) Oops, yes, 13 lines, which explains why the 128B of RAM and 128B of hardware registers don't conflict with the 4K of ROM as they would with only 12... right? -- Thomas Boutell Boutell.Com, Inc. http://www.boutell.com/ Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://stella.biglist.com
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