Hallo Per, > How about plugging a 6809 into a 6510 socket..? :) I have thought about that many years ago after my first 65816 broke down. To be able to run at 1 MHz, the 6809 needs a 4 Mhz clock. Creating it from the onbard ~1 MHz is possible but how to synchronize the Q and E output with Phi0? IIRC it was one of the CBM-Hackers that pointed me out to the 6809E which you have to provide with Q and E. But it seems that these are rare. I have lot of 68x09's but only lately I found by acident a 6809E (and I have still to desolder it). IMHO it is doable but would it create enough interest? Three ways to implement the 6809(E): 1- replace the 6510 directly 2- as cartridge like the CP/M cartridge: just the 6809 and some logic to (de)activate it 3- as cartridge where the 6809 has its own RAM and ROM and exchanges data with the C64 by means of: - DMA, as the SCPU does - 6526/6821 I/O-bridge Personal choice: 2. Software shouldn't be a problem IMHO: FLEX. Main problem: who has time and interest to develop it? (I have only a lot of the last :( ) -- ___ / __|__ / / |_/ Groetjes, Ruud Baltissen \ \__|_\ \___| http://Ruud.C64.org Message was sent through the cbm-hackers mailing listReceived on 2010-02-02 19:00:04
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