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Thread: CGA to VGA Video converter to suit Amiga, C128, Microbee, Tandy CoCo3 & other retro systems

  1. #1
    Microbee Technology Pty Ltd Commercial Vendor MbeeTech's Avatar
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    Default CGA to VGA Video converter to suit Amiga, C128, Microbee, Tandy CoCo3 & other retro systems

    Click image for larger version. 

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ID:	82659CGA to VGA Video Converter kit
    for retro computer systems.

    Click image for larger version. 

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    Designed to enable the use of VGA monitors with older computers, the Microbee VGA
    video converter allows for analogue or digital inputs.

    The digital mode converts true CGA digital input (RGB + Intensity) and provides the proper
    CGA color map. This is the mode that is used by the Microbee Premium, Premium Plus &
    256TC models, along with regular IBM PC’s and numerous other computers.
    There is also a jumper to implement the 'Brown fix' for the Commodore C128's
    80 column mode (normally in the CGA map there is a dark yellow which is supposed to be a
    brown color on the C128's output - setting this jumper selects brown instead of dark yellow)

    The analogue mode allows for use with other computers that have true analogue outputs,
    such as the Commodore Amiga (the converter has been tested with the Amiga & works brilliantly!)
    Normally it works with TTL level positive HSYNC & VSYNC as the timing signals but can also work
    with composite sync. It has options to set the sync polarity for odd-ball video systems that differ
    from positive sync (15Khz) via jumpers as well.

    The circuit also cleans up the Sync signals (HSync & VSync) to provide true composite sync
    (HSync XNOR'd with VSync) and rock steady display. The kit employs a pre-built video scaler board
    along with an adapter board (which has to be assembled) that does the Digital CGA map conversion
    & cleans up the Sync signals.

    The Scaler board (GBS-8200) is also modified by us to cure a common problem (caused by poor
    timing of the DRAM on the board) that causes
    random white dots on the output (snow).

    Available as a complete kit with all parts, PCB and case, or as a short form kit with the adapter
    pcb & parts for those who already have a GBS-8200 video scaler board.

    The project has just been published as a 7 page construction article in Australias 'Silicon Chip'
    magazine.

    Click image for larger version. 

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    The kit(s) can be purchased through our web store : Link <here>

    Pictures of the unit working with: Amiga, Microbee Premium Plus, Tandy CoCo3, C=128

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  2. #2
    DerekP's Avatar
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    You should bold this bit:
    The Scaler board (GBS-8200) is also modified by us to cure a common problem (caused by poor
    timing of the DRAM on the board) that causes
    random white dots on the output (snow).

    From what i understand, all those other eBay offerings from other places have not been 'fixed' like yours has
    / Derek
    [SIZE=1]Canberra, Australia.[/SIZE][SIZE=1]
    [SIZE=1][COLOR=#008000]- Wanted: A500+ preferably in AUS.[/COLOR][/SIZE][/SIZE]

  3. #3
    Technoid's Avatar
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    Will you be restocking these kits or was it just a limited run?

  4. #4
    Pgovotsos's Avatar
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    The short form kit and short form with case are still available at their store at the below URL. The link in the OP doesn't work for me. Only the most expensive model is showing out of stock.

    http://www.microbeetechnology.com.au...-converter.htm

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