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  • Circuit outline for Auxiliary Video Extension?

    From Louis Ohland@ohland@charter.net to comp.sys.ibm.ps2.hardware on Sat May 30 09:17:24 2026
    From Newsgroup: comp.sys.ibm.ps2.hardware

    https://ardent-tool.com/video/AVE_Schematic.gif

    Is there a more complete AVE schematic?

    Surfing for an IBM patent for the AVE turns up nothing. A patent might
    have a more detailed AVE circuit description...
    --- Synchronet 3.22a-Linux NewsLink 1.2
  • From Louis Ohland@ohland@charter.net to comp.sys.ibm.ps2.hardware on Sat May 30 09:51:08 2026
    From Newsgroup: comp.sys.ibm.ps2.hardware

    http://ps-2.kev009.com/ohland/Video/Auxiliary_Video_Connector_Signals.html

    Foundt a little more detailed schematic that references the buffers as Tri-State. At this point, it seems like they used 244s? Maybe 245s?

    Louis Ohland wrote:
    https://ardent-tool.com/video/AVE_Schematic.gif

    Is there a more complete AVE schematic?

    Surfing for an IBM patent for the AVE turns up nothing. A patent might
    have a more detailed AVE circuit description...
    --- Synchronet 3.22a-Linux NewsLink 1.2
  • From Louis Ohland@ohland@charter.net to comp.sys.ibm.ps2.hardware on Mon Jun 1 06:42:20 2026
    From Newsgroup: comp.sys.ibm.ps2.hardware

    Looking at the G191 XGA Serializer Palette-DAC. https://ardent-tool.com/datasheets/INMOS_IMSG191.pdf

    Page 3, middle of right functions.

    Video Feature Bus Interface

    Under "Feature Bus Control" are:
    AuxVidEVideo
    AuxVidESync
    AuxVidEDClk

    "Video Feature Bus"
    AuxVidData0-7
    notAuxVidBlank
    AuxVidHSync
    AuxVidPClkIn
    AuxVidPClkOut

    More meditation needed

    Louis Ohland wrote:
    http://ps-2.kev009.com/ohland/Video/Auxiliary_Video_Connector_Signals.html

    Foundt a little more detailed schematic that references the buffers as Tri-State. At this point, it seems like they used 244s? Maybe 245s?

    Louis Ohland wrote:
    https://ardent-tool.com/video/AVE_Schematic.gif

    Is there a more complete AVE schematic?

    Surfing for an IBM patent for the AVE turns up nothing. A patent might
    have a more detailed AVE circuit description...
    --- Synchronet 3.22a-Linux NewsLink 1.2
  • From Louis Ohland@ohland@charter.net to comp.sys.ibm.ps2.hardware on Mon Jun 1 06:54:49 2026
    From Newsgroup: comp.sys.ibm.ps2.hardware

    https://ardent-tool.com/datasheets/INMOS_IMSG190.pdf

    Page 7

    Video Feature Bus Interface

    Under "Feature Bus Control" are:
    AuxVidEVideo
    AuxVidESync
    AuxVidEDClk

    "Video Feature Bus"
    AuxVidData0-7
    notAuxVidBlank
    AuxVidHSync

    G190 does not use a PLL, does not have PClk...
    AuxVidPClkIn
    AuxVidPClkOut
    --- Synchronet 3.22a-Linux NewsLink 1.2