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Thread: New USB keyboard adapter - Sum (Catfish) USB adapter

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    Commercial Vendor RetroAmi.com.pl's Avatar
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    Default New USB keyboard adapter - Sum (Catfish) USB adapter

    Hello Amibayers

    Today we would like to annouce that we start to sell new USB keyboard adapter.

    Sum adapter enables connecting USB HID keyboards to your Amiga. It has been designed for installation inside A1200’s casing. Sum is based upon 16-bit Microchip microcontroller.

    Sum provides built-in USB stack which enables USB HID keyboards support without the need for installing additional AmigaOS software drivers. Device’s installation procedure consists of simply attaching it the U7 chip located on A1200’s motherboard.

    Additional feature of the adapter is its „Bootloader” function allowing future firmware upgrades.
    Sum comes with dedicated configuration mode, which becomes available when one presses simultaneusly R-Shift + Pause keys. User preferences are saved to the built-in EEPROM memory – thanks to which when you reconnect the device – it is already configured!

    Price: 126,99 PLN (about 30€). Direct link to our web store.

    Warranty 24 months.

    Click image for larger version. 

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    Features of Sum (A1200 - internal version)


    • support for both USB HID and USB-PS/2 keyboards,
    • A1200 compatibility (U7 chip-attached),
    • built-in USB stack,
    • configuration mode (activated by R-Shift + Pause key combination),
    • built-in EEPROM memory enabling user preferences storage,
    • „Bootloader” function allowing future firmware upgrades,
    • „Status” indicator LED providing information about device’s state,
    • built around 16-bit Microchip microcontroller utilizing nanoWatt technology,
    • non-blocking keyboard A1200


    Suported devices


    • Logitech K230
    • Logitech Deluxe 250 Keyboard (Y-UT76)
    • Logitech K120
    • Logitech Compact Keyboard K300
    • Dell KB212-PL
    • Dell KB212-B
    • Dell KB1421
    • Dell SK8115
    • HP KU-0316
    • Microsoft KU-0459
    • ZALMAN ZM-K500
    • KB8118

  2. #2
    Amibayer! Xanxi's Avatar
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    Awesome! Does it allow 3 fingers reset combo? If yes, i would be interested in one immediatly.
    Would it also be compatible with the A4000?

    Is the list of compatible keayboards limitative?
    Last edited by Xanxi; 19th August 2015 at 18:09.
    A4000/CSMKII60/C643D/Deneb/CatWeasel/A2386/STBNitro/SB16/MT32
    A500+/Viper520CD/KCSPowerPC


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    Rodpulsar's Avatar
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    Reset combo does work perfectly

    A sidenote too : the U7 component is NOT the one used by the LYRA (for example)
    Last edited by Rodpulsar; 19th August 2015 at 18:36.

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    Commercial Vendor RetroAmi.com.pl's Avatar
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    From today we started to sale SUM keyboard adapter for Amiga 600.

    http://retroami.com.pl/index.php?id_...duct&id_lang=1

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    Drag0nFly's Avatar
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    @RetroAmi.com.pl: Sorry to dig up an old thread, but I was wondering whether there are any plans to release a version of your Sum/Catfish A1200 adapter which connects to U13 (keyboard MPU) as opposed to U7 (CIA-A); similar to the above-mentioned Lyra?

    This would be _especially_ useful for Amibayers who have had their A1200 mobos recapped and socketed (using a popular service offered here); and thus have both CIA chips sitting in sockets. I for one would be willing to pay extra for such an adapter, as the only other choice would be to replace the motherboard.

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    Amibayer! ajk's Avatar
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    @Drag0nFly

    Well it's not quite the only choice - you can un-socket and solder the CIA directly to the motherboard for this purpose.

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    Not something I can do, I'm afraid. It'll have to be done professionally, which I suppose would cost the same as a new mobo. Naturally, had I known that most of these adapters fit on the CIA chip I would not have done it in the first place. For some reason I was certain they hooked up to U13.

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    Math inside Amibayer! BLTCON0's Avatar
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    Quote Originally Posted by Drag0nFly View Post
    @RetroAmi.com.pl: Sorry to dig up an old thread, but I was wondering whether there are any plans to release a version of your Sum/Catfish A1200 adapter which connects to U13 (keyboard MPU) as opposed to U7 (CIA-A); similar to the above-mentioned Lyra?

    This would be _especially_ useful for Amibayers who have had their A1200 mobos recapped and socketed (using a popular service offered here); and thus have both CIA chips sitting in sockets. I for one would be willing to pay extra for such an adapter, as the only other choice would be to replace the motherboard.
    Since it clips onto the CIA chip, only 4-5 pins are actually wired through (keyboard clock, keyboard data, +5V, ground and maybe the reset line, you get the idea).
    So you can desolder the clip-on PLCC socket from the adapter and run the corresponding wires to your A1200 CIA socket, carefully soldering the wire tips on the corresponding CIA pins.
    Actually this only needs be done for Keyboard Clock and Keyboard Data, as +5V, GND and Reset can be found elsewhere on the motherboard.
    Actually #2, you could search for vias connecting to those pins and solder the wire tips there, avoiding the delicacy of pin-soldering.

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    Drag0nFly's Avatar
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    @BLTCON0; Thanks for the tip - I leave it as a last-resort. I spent a fortune on the board (three times its worth), so I would not dare to try even the most basic soldering on it. (The most I've done is to desolder a battery on my A-501)

    I guess I was hoping that there would be a successor to the Lyra (which was PS/2 only) that offered USB. Naturally, I can check how much desoldering and resoldering will actually cost, but like to avoid it if at all possible...

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    Amibayer! ajk's Avatar
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    There are lots of people who can do it for a reasonable fee, but of course there are the costs of shipping a board back and forth to consider also.

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