Viewing 8 posts - 1 through 8 (of 8 total)
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  • #5126
    Just4Fun
    Participant

    I just got a batch of NEC V20 CPUs (uPD70108HCZ-16). For the uninitiated the CPU V20 is a “clone” (for the better) of the 8088 Intel used for the first IBM PC. But not only… in fact the V20 also has a particular mode of operation in which it can natively execute code for the Intel CPU 8080.
    In this way you have the theoretical possibility of having both “two worlds”… or the CP / M-80 and the one for x86, il CP / M-86.
    In addition this particular version of V20 (uPD70108HCZ) is “full-static CMOS”, which allows a series of HW facilitations in use.
    The idea would be to replicate the approach I used in the Z80-MBC and Z80-MBC2 and then use an Atmega as a universal peripheral emulator, clock generator and EEPROM.
    Obviously the HW / SW complexity of a V20 CPU is much higher than a Z80… and therefore the real feasibility is still to be demonstrated and the obstacles to be overcome are many… but that's just the thing that tickles me, seeing that such an approach has never been taken by anyone by me (and the evil ones could say… “there will be a reason…” 🙂 )

    #8703
    Just4Fun
    Participant

    I take this post again “dated” just to say that what was an idea has become a working card (and easy to build).

    For that interested link with all the detail information is: https://hackaday.io/project/170924

    Alternatively, an 80C88 can also be used (see link indicated).

    • This reply was modified 1 year, 7 months ago by Just4Fun.
    • This reply was modified 1 year, 7 months ago by Just4Fun.
    • This reply was modified 1 year, 7 months ago by Just4Fun.
    #8707
    Picmicro675
    Moderator

    I think it's a particular passion. I don't see an interest in those who want to create a new project.
    Applies to those with a passion for retro.

    #8709
    Just4Fun
    Participant

    @Picmicro675:
    The initial post was dated… I had it “exhumed” to say that then I made a card, but having entered well 3 link the post was hacked by the antispam.

    However the link with all the details is this: https://hackaday.io/project/170924

    Let's see if the antispam saws me once again….

    #8724
    Picmicro675
    Moderator

    Well, you're so good it would be nice to assemble a rockwell 6502, so yes it invites many to experience emotions as with the Vic20…
    I don't remember much of CP / M fans, while more those with Z80 and 6510.
    Although in modern times they are oriented so much to SBC ARM or that measure.

    #8728
    Amilcare
    Keymaster

    How many memories when I programmed the C64 in assembler to have additional functions in the expansion port.
    I was able to program the scenarios for a popular orchestra. Of course, to give a professional look, I closed all the electronics in a rack container and took only the keyboard outside.
    In those days, managing the lights with a monitor and a keyboard was a real gem that earned him contracts and higher level engagements.

    #8732
    Just4Fun
    Participant

    @Picmicro675:
    really as the next CPU to play with I have a 68000… however never ever…

    #9377
    Just4Fun
    Participant

    Hackaday posted a short review on the V20-MBC who.

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