mdj wrote:
On Aug 22, 11:53 am, mdj <mdj....@gmail.com> wrote:On Aug 21, 5:28 am, "mre...@gmail.com" <mre...@gmail.com> wrote:Now my questions: * Does somebody know if $CE00-$CFFF is the correct memory range? * Are there any other RAM memory areas in the $C000-$FFFF ROM address space? * Is it shared with some of the main or language card memory, or is it stand-alone memory? * Is it non-volatile RAM?That RAM is used as a track buffer for reading and writing 3.5" disks. If memory serves, it's 2KB, and was more than likely SRAM.
If it's a track buffer, then it will have to be bigger. Even a 5.25" disk track buffer is 4KB, or over 6KB if in nibble format... -michael AppleCrate II: An Apple II "blade server"! Home page: http://members.aol.com/MJMahon/ "The wastebasket is our most important design tool--and it's seriously underused."