On 2012-05-15, at 13:57, Baltissen, GJPAA (Ruud) wrote: >> I imagine it going between CPU and the main board. > > What about Nicolas Welte's idea, the 6502-RAMROM? It enables you to add > a lot of RAM and RAM to those 6502 systems that haven't. Best example: > the PET 2001, certainly the types with the rare 65xx RAMs and ROMs. In > your case you could demirror the SID and VIC and use the freed area for > the extra hardware needed to control the extra address lines of the > bigger EPROMs (or more likely, FlashRAMs). I am not sure if I made myself clear. I want to be able to have a ROM replacement for the C64 (also other systems but 64 is the starting point), where I can easily manage what rom image will be made visible to the system at various addresses. It has to have a piece of own software too. The one that will display the menus for selection of the ROM images. After selecting, the images are made visible os ROM areas to the system and the system is rebooted via cold vector. As far as I remember Nicolas' design I think he wasn't planning such features (flash card or usb connection, dynamic reconfiguration / reboot, etc.), was he? > And all that is needed is just popping the 6510 out of the board, plug > in your card and the 6510 on top of your card again! Yup, more or less this is what I would be expecting. Plus possibly extra line(s) for triggering the menu at power-up. > The only link I can give you now for the moment: > http://d81.de/6502RamRom/ From what I quickly had a look at again - it doesn't fulfill "my" specs. Could be used as a test / starting point but extra bits would have to be added. -- SD! Message was sent through the cbm-hackers mailing listReceived on 2012-05-15 22:00:35
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