C64/C128 CP/M Cartridge Interest?

On 12/23/2010 8:15 PM, Teo Zenios wrote: Having been involved with Commodore computers for many years, I not only own both the C64 CP/M cart but also both the CP/M capable C128 and it's brother, the C128D. Providing more detail to my original request: The Commodore 64 CP/M cart is woefully designed, and only works on the earliest revisions of the C64. It is a clone of the Apple-II CP/M cart, done hastily and incorrectly. The C128 CP/M support is robust, but slow. Due to the nature of the design, the Z80 in the C128 runs at 2MHz (4MHz cycle, but every other cycle is stretched for 3 cycles). As such, I would like to investigate the ability to design a newer CP/M cartridge that will work with both the C64 and the C128, runs much faster than either the CP/M cartridge of the internal Z80. It could be simply an exercise in academics, but I thought I would at least inquire if others had any interest. The items I feel are interesting about such a design: * The ability to use the C64/C128 as a second processor to handle IO. * The ability to tri-state the Z80 and stop the clock, to allow the 64/128 to process a "message" created by the Z80 environment. This would provide valuable information on how to interface a second processor to the C64 bus. * The ability to design a unit that could not only function as an add-on for the CBM line, but also function as a standalone unit. Jim -- Jim Brain, Brain Innovations brain at jbrain.com www.jbrain.com www.jbrain.net (eStore)