Shannon Posted January 26, 2009 Share Posted January 26, 2009 (edited) I noticed that WinstonX allocates 16meg or RAM for ST memory. 4meg for normal RAM and the other 12 meg for what it refers to as "upper" memory. Is there a reason for this? Can this "upper" memory be accessed or modified by an ST that only has 4meg of RAM to use? In other words WinstonX does NOT allow you to select more than 4meg RAM. So I was wondering what it may be reserving this extra 8megs for. Are there custom TOS images out there that are larger than the normal TOS'? Ok nevermind. I think I answered my own question. Looks like TOS is located in memory that high. Edited January 26, 2009 by Shannon Quote Link to comment Share on other sites More sharing options...
anzac Posted January 27, 2009 Share Posted January 27, 2009 ok... here´s what i remember from the times where i read all magazines regarding STs... i have this idea that there was a major constraint on memory expansion possibilities because Atari had selected an MMU that was hugely inflexible and with a 4MB limit. the same MMU caused problems to Atari in general because later models, though might be able to easily expand memory (like STes), had to retain that MMU with all its limitations for compatability reasons. in higher machines like the TT, the compatibility issue was circumvented by using a standard MMU for the "normal" 4MB "ST Ram" (the memory that all STs, TOS and every software could "see"), and having added components for being able to use more memory that could only be used by specific software written to "see" it... the "cheap" MMU problem is probably way up there in the list of ST birth problems (or problems that should never have been), along with the Yamaha sound chip (and keyboard controller) and the under the machine mouse/joystick ports... Quote Link to comment Share on other sites More sharing options...
Beetle Posted January 27, 2009 Share Posted January 27, 2009 Hi, afaik thats correct, but TT could have 10 MB ST RAM (2 MB onboard, 8 MB on ST RAM board) and Falcon could use up to 14 MB ST RAM. Greetings, Beetle Quote Link to comment Share on other sites More sharing options...
Shannon Posted January 27, 2009 Author Share Posted January 27, 2009 ok cool. Thanks for the update. I used to read alot about the ST back in the day but it was years before I picked up one and I never really used it when I did. I was way into other things at the time. Quote Link to comment Share on other sites More sharing options...
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