aiiadict@gmail.com wrote:
Actually, this is the SpeedDemon card patent, on which the later, more refined design of the Zip Chip was based.what was refined in the Zip Chip design? I want to see if I can modify the SpeedDemon scheme to use 64k RAM instead of 4k, and never have to look at TAG RAM... Just look at address and determine if data needs to be sent to the MB.
I'd have to do a detailed review to give you a complete list. The delays were changed, and derived from a counter instead of a one-shot, for one thing. The cache size was increased, and the tag handling improved to handle up to 2MB (?) of RamWorks-style AUX RAM. -michael Music synthesis for 8-bit Apple II's! Home page: http://members.aol.com/MJMahon/ "The wastebasket is our most important design tool--and it is seriously underused."