MMC Replay & "Amiga clockport"

Es gibt 8 Antworten in diesem Thema, welches 2.984 mal aufgerufen wurde. Der letzte Beitrag (16. Dezember 2009 um 19:31) ist von Wiesel.

  • Hi!

    I want to buy MMC Replay.
    In manual is written about Amiga clockport where is possible to mount RR-Net...
    ...but I don't need RR-Net, I want to ask that it's really "clockport" - time and date can be read from this?
    I know only that there is mountable RR-Net, nothing about time and date is written...

    Can anybody explain it me?

    Thank you all for every answer.

    Miro

  • There are some infos about clockport on RR and MMC64:
    Bitte melde dich an, um diesen Link zu sehen.
    Bitte melde dich an, um diesen Link zu sehen.
    I don't know if anything has changed with MMCR, but I think Wiesel can give you more hints :)

    camper: Der C64 steht auch nicht mehr im Laden und man kann ihn immer noch kaufen ;)
    EDIT: Okay, Du bist selbst drauf gekommen, während ich dies schrob ... :)

  • Zitat

    I want to ask that it's really "clockport" - time and date can be read from this?


    its a clockPORT. if there is no actuall clock connected, then ofcourse there is no clock.

  • Zitat

    so, can you please explain me which or how clock can be connected?


    i have no idea. the port is called like that for historic reasons - it was used on the amiga to connect a rtc. no idea if there actually exists one that you can connect to the port on the mmcr, i doubt it.

  • I am not a hardware specialist, so I don't exactly know wether or not you can connect other hardware than SilverSurfer or RR-Net/RR-Net2 safely to the port. Worth a try I'd say. :)
    Whatever hardware you connect will have to map to the c64 IO space around $de00/$df00 then (here's the point I am not sure about - wether the hardware module tells to map registers or the retro replay/mmc combo does - or even how the whole communication/detection at that port works).

    So, basically you should be able to connect smthg like Bitte melde dich an, um diesen Link zu sehen. this, but making up the drivers will be always on to you.

    Wiesel may tell us what additional hardware could get connected I guess.

  • Zitat

    (here's the point I am not sure about - wether the hardware module tells to map registers or the retro replay/mmc combo does - or even how the whole communication/detection at that port works).


    the "port" does, whatever you connect to it will be mapped to well...where the port maps to :)

    besides that, afaik the clockport on the rr/mmcr is not a "full" clockport as it is in amigas... so only some of the clockport hardware works with it.

  • The clockport is called like that because it was initially intended to carry the OKI6242 RTC in an Amiga 1200. However, since these RTCs were always contained in the obligatory accelerator cards, the port was free pretty much all the time.

    Commodore made two address spaces available on that port: The "RTC space" and the "spare space". The RTC space was occupied by the RTC on the accelerator, so adding another RTC would have been pointless. I was the first to map "something" to this port with the Catweasel MK2. This product maps to the "spare space" of the port.

    After the Catweasel MK2, I designed other things for this port, such as the Silversurfer, VarIO (special A1200 version). When the Retro Replay was in the test-phase with the Cyberpunx, we talked about the possibility of debug-access through RS232 at the Mekka/symposium party, which is where the idea of a clock-port for the C64 was born: It made an existing design (Silversurfer RS232) available to the C64, solving multiple problems at the same time (development, time-to-market, design verification, low quantity etc.).

    The "clockport" of Retro Repaly and MMC Replay has limitations: Although it's called clockport, it's main use has always been the secondary use, which is "spare". One limitation of the C64 implementations is that ONLY the spare-space of this port is used. Another limitation is that only 14 of the 16 registers that the port has can be used. The other two addresses are occupied by the Retro Replay registers.

    This makes only a few products available to the MMCR/Retro Replay/MMC64 implementations:

    - Silversurfer (uses 8 addresses and NMI)
    - RR-Net (uses exactly 14 addresses, no NMI)
    - MP3@64 (uses 3 addresses, no NMI)

    The Catweasel MK2 is NOT compatible, because one of the most important registers (the data FIFO register) is not accessible without additional interfacing. Also, the Subway (mentioned by GeilerMacker) will most probably not work, because certain banking registers are not accessible. Since there's the other limitation of "only spare-space available", any Amiga-RTC module will NOT work on a C64-clockport, because the RTC-space is not accessible by the C64.

    There you have the weird essence of this post: The clockport is not compatible with an Amiga clock-module :smile:

    Jens

    Bitte melde dich an, um diesen Link zu sehen. - Das offizielle iComp Supportforum ist online.