RE: 6510 CPU extensions
Date: 2002-04-22 10:19:21

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    I tried to post this e-question before, but my sender-address was wrong,
    therefore the e-mail was bounced. This one should work...
    What did you do with the two-phase clock ?
    >|> Last weekend I implemented an extra feature to the 6510 FPGA. It is now
    >|> possible to connect the 6510 board to the PC by means of a serial
    >|> simple UART inside the CPU (that runs at a fixed bitrate of approx.
    >|> gives access to the CPU-bus by means of a simple protocol. This
    >|> protocol-block is capable of generating internal DMA cycles. In other
    >|> it is now possible to look in the C-64's memory or write into the
    >|> memory while the C-64 is running.
    >|In other words, you made the first in-circuit emulator for the C64,
    >|right? ;-)
    >Well, basically, yeah... you could put it that way. It started out just as
    >CPU though, I didn't have any intentions of making an ICE. At this point I
    >can't use this UART to 'see' the internal registers, but this would be a
    >small step. The sad part is that I would have to 'pull' these registers up
    >to the top level of the design. This makes the VHDL code a bit sloppy.
    >|BTW: what's your opinion, should it be possible to modify your design
    >|for emulating a 8501 CPU (the heart of C16 / C116 / Plus/4)?
    >Of course, that shouldn't be a problem; I think it is just a 6502 with
    >tiny modifications. I am planning to implement the 65816 as well, since
    >there are many users.
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