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Commodore 128 and 80 Colums

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    Commodore 128 and 80 Colums

    Greetings all.

    Just bought a C128, and the introduction guide says to get 80 columns an RGBI monitor is needed. I have two - haven't tried them because I don't want it in my computer room; takes up too much space. Is there an alternative? I have a TV/monitor; will this work? It has component and VGA connections? Or is there a DB9 converter that will work and then hook it up to a VGA LCD.

    Thanks

    #2
    I guess maybe an RGB to VGA converter???

    Comment


      #3
      If you're handy with a soldering iron, perhaps you could try building one of the circuits on this page:

      https://sites.google.com/site/h2obse...28/rgbi-to-vga

      There's also the RGBI video DAC board sold on this site:

      http://www.bit-c-128.com/

      Both of these pages mention the Gonbes GBS-8200 and GBS-8220 video converters. I don't know anything off-hand about these units, but they're apparently available from various sources. Good luck!
      -Adam
      My home page My collection
      My wants list My goofy music

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        #4
        If you don't need color you can use the monochrome output on the DB9 connector and hook it up to the Y connector of your YUV input. That will give a crisp output in greyshades.
        A simple DB9 connector with a coaxial cable ending in a CINCH connector will do.
        You can try and use the CVBS input of yor monitor/TV too but I found out there is much HF noise on the monochrome output and some monitors/TV's interpret it as color information making the display unreadable.

        Comment


          #5
          I made contact with the creator of the board/system, and will probably buy what he's got. To use the C128 on a VGA monitor is awesome!

          Thank you very much for your response AdamAnt316!!!

          His prices are very reasonable!!!

          Comment


            #6
            Yeah I've been breaking out some of my old cables/etc to see what I can test with but with caution anyway. It's amazing to find out just how much STUFF a collector has when breaking out boxes of stuff hanging around the house!!!!

            Thanks for your ideas!

            Comment


              #7
              Even though you can generate 640x240 lines (or even 480 with interlace) on the RGB output you are still left with rather huge borders when using a RGB(I) to VGA converter. It would be nice to have a 1:1 pixel mapping on a VGA display (on a 800x600 display for example) or borderless on a 1280x960 for example. The sharpness/clarity would be much better.

              Comment


                #8
                For the record a 1084 is a perfect fit if you can find one. I have a C128D in my office with this monitor. I use cables from both video ports on the computer into different video in ports of the 1084. When I need 80 column mode I set the RGB (CVBS) button found on the 1084's front panel to the OUT position. On the C128 I set the 40/80 col key to the IN position.

                When I want 40-col mode I have the opposite - RGB (CVBS) In, 40/80 col key out.

                You have to reboot/reset to switch back and forth.

                I would try to find a 1084 or similar monitor that has the two video modes and two sets of output ports. Otherwise with the VGA solution, wouldn't one need a switchbox to simulate both types of video ports' signals? Perhaps a switch box would give you the ability to switch output cables going to different ports. I did not check the VGA adapter solution mentioned above, perhaps there is a simpler solution.

                Here is the system I am referring to
                http://vintagecomputer.net/pictures/...orkstation.jpg

                Bill
                Last edited by billdeg; July 18, 2016, 07:44 PM.
                @ BillDeg:
                Web: vintagecomputer.net
                Twitter: @billdeg
                Youtube: @billdeg
                Unauthorized Bio

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                  #9
                  Originally posted by billdeg View Post
                  Otherwise with the VGA solution, wouldn't one need a switchbox to simulate both types of video ports' signals? Perhaps a switch box would give you the ability to switch output cables going to different ports.
                  Very true. A VGA switchbox with 2 VGA inputs and 1 VGA output. You would need a composite/s-video-to-VGA adapter, in addition to the BIT-C128 digital RGB-to-VGA adapter.

                  Tired from walking around Victoria, B.C.,
                  Robert Bernardo
                  Fresno Commodore User Group
                  http://www.dickestel.com/fcug.htm
                  July 30-31 Commodore Vegas Expo v12 -
                  http://www.portcommodore.com/commvex

                  Comment


                    #10
                    so, if you want both modes, wouldn't you recommend picking up a 1084 or similar display rather than a VGA? There are a few 1084's on ebay right now. I can only speak specifically for the 1084 without the "S" (don't know about the 1084-S). I would get a 1084 to be safe, I don't recall if the S model also works this way..
                    @ BillDeg:
                    Web: vintagecomputer.net
                    Twitter: @billdeg
                    Youtube: @billdeg
                    Unauthorized Bio

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                      #11
                      My memory is vague, but I owned a dozen or so 1084 monitors at one point. It seems to me that there were multiple variations of 1084 and 1084S, which were all different.
                      Be polite and I may let you live.

                      https://www.youtube.com/playlist?lis...5NBVfKX5471R9U

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                        #12
                        Yes, if I was only going to pick one, I'd go with what I know works, the 1084, no -S.
                        @ BillDeg:
                        Web: vintagecomputer.net
                        Twitter: @billdeg
                        Youtube: @billdeg
                        Unauthorized Bio

                        Comment


                          #13
                          I use a 1902 with my 128, but the 1084 is a good choice.
                          I use my C128 because I am an ornery, stubborn, retro grouch. -- Bob Masse
                          Various projects and oddities: http://oldvcr.blogspot.com/
                          Machine room: http://www.floodgap.com/etc/machines.html

                          Comment


                            #14
                            Originally posted by billdeg View Post
                            Yes, if I was only going to pick one, I'd go with what I know works, the 1084, no -S.
                            I'm pretty sure there are multiple variations of non-S 1084.
                            Be polite and I may let you live.

                            https://www.youtube.com/playlist?lis...5NBVfKX5471R9U

                            Comment


                              #15
                              Originally posted by ClassicHasClass View Post
                              I use a 1902 with my 128...
                              FYI, some 1902's don't work with the Amiga's analog RGB (though they were supposed to). For the C128's digital RGB, the 1902's were fine.

                              Going to the ViC 64 club of Victoria tonight,
                              Robert Bernardo
                              Fresno Commodore User Group
                              http://www.dickestel.com/fcug.htm
                              July 30-31 Commodore Vegas Expo v12 -
                              http://www.portcommodore.com/commvex

                              Comment

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