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8088 Domination: A new FMV method for 8088 PCs

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    #16
    Originally posted by Trixter View Post
    PCjr/Tandy can't play digitized audio without consuming 90% of the entire machine, so that's out of the question, sorry
    I imagine this applies to PWM techniques, but what about LPC or CVSD playback using the PCjr Speech Adapter?

    Comment


      #17
      Apologies if this is a stupid question - but I just wanted to check - is it essential to use the composite out to get color?
      Twitter / YouTube

      Comment


        #18
        Is a Sound Blaster 2 required? I can't actually play this demo because I don't have an 8-bit ISA sound card, and they seem to be difficult to come by at a reasonable price.
        Looking for: Needham's Electronics PB-10 Microcontroller Adapter (looking for one since early 2012!).

        Comment


          #19
          Originally posted by SpidersWeb View Post
          Apologies if this is a stupid question - but I just wanted to check - is it essential to use the composite out to get color?
          For the first part of the demo, yes. The second part (the silent film homage and after) is in black and white by design.

          Originally posted by cr1901 View Post
          Is a Sound Blaster 2 required? I can't actually play this demo because I don't have an 8-bit ISA sound card, and they seem to be difficult to come by at a reasonable price.
          For now, a Sound Blaster or compatible card is required. It must have a DSP 2.00 or better.
          My Retro Computing and Vintage Gaming Blog : http://nerdlypleasures.blogspot.com/

          Comment


            #20
            Originally posted by reenigne View Post
            I was wondering why the colours were brighter on the capture than on DOSBox. Which video mode are you using? I had been assuming it was the normal BIOS mode 6 with palette 15 (which has the same colours on old and new CGA).
            Exact setup code:

            Code:
            procedure xdc_setvid(b:byte);
            {1=160x200x16, 2=640x200x2}
            begin
              asm
                mov ax,0006
                int 10h
              end;
              if b=1 then asm {turn on colorburst}
                mov dx,m6845_mode_ctl
                mov al,c_videosignal_enable+c_graphics_enable+c_640x200_enable
                out dx,al
              end;
            end;
            I generated 16 colors in "160x200" style and then captured each color with my capture device with everything set to defaults (ie. no adjustments). I then determined the RGB values of those colors and converted my graphics to those standards.
            Offering a bounty for:
            - A working Sanyo MBC-775 or Logabax 1600
            - Music Construction Set, IBM Music Feature edition (has red sticker on front stating IBM Music Feature)

            Comment


              #21
              Originally posted by pearce_jj View Post
              Trixter, have you any idea how far this (presumably new compression) technique could be pushed? For instance, might "TV quality" be possible with say a 12MHz 286?
              Yes, with limitations. The basic techniques (which I'm still writing up, sorry it's taking so long) can be easily applied to any chunky mode (Tandy 320x200x16, MCGA 320x200x256) and datarate, but you run into disk bandwidth issues if you're trying to do too much. Once you hit a certain CPU power threshold, it makes more sense to switch to something else (such as Cinepak, or a custom algorithm based on vector quantization). For example, a 386-25 can play back 160x120 Cinepak @ 30fps while not exceeding a datarate of 150KB/s, so that's definitely the point at which you switch to something like that.

              My technique can easily be ported to Tandy 320x200x16 and have it still perform nearly as well as it does in Domination, but until I get a Tandy DAC system, I have no real hardware to test on, sorry. I'll be releasing source and instructions after I finish the write-up, so if someone else wants to take up the charge, I'd be tickled.

              Originally posted by Cloudschatze View Post
              I imagine this applies to PWM techniques, but what about LPC or CVSD playback using the PCjr Speech Adapter?
              If the sidecar can play audio independently of the CPU, it should be possible. And I think it can, looking at the tech ref quickly. But I won't be tackling that any time soon, sorry And besides, it would only sound decent for voice.
              Offering a bounty for:
              - A working Sanyo MBC-775 or Logabax 1600
              - Music Construction Set, IBM Music Feature edition (has red sticker on front stating IBM Music Feature)

              Comment


                #22
                Originally posted by Trixter View Post
                Exact setup code:
                For some reason I was thinking that the default palette for BIOS mode 6 is light grey, but it is in fact white so it's not necessary to set the palette explicitly and this code is fine. I was also thinking that the colours in DOSBox are too dark, but the real problem is that they're hue shifted so that red things look purple. This can be corrected by setting DOSBox's hue to ~40 (for 0.74) or ~20 (for current SVN). We improved it a bit a while back but perhaps we didn't go far enough!

                Comment


                  #23
                  Originally posted by reenigne View Post
                  This can be corrected by setting DOSBox's hue to ~40 (for 0.74) or ~20 (for current SVN). We improved it a bit a while back but perhaps we didn't go far enough!
                  In current SVN, are you setting "late CGA" mode (ctrl-alt-F11)? when I do that, the colors look close enough to Trixter's capture without further hue shifts - at least to me. (Late CGA emulation could still use some improvements though, as we discovered a while back.)
                  int10h.org :: :: :: blog

                  Comment


                    #24
                    Originally posted by el_VR View Post
                    In current SVN, are you setting "late CGA" mode (ctrl-alt-F11)? when I do that, the colors look close enough to Trixter's capture without further hue shifts - at least to me. (Late CGA emulation could still use some improvements though, as we discovered a while back.)
                    Oh yeah, you're exactly right. I was thinking that old and new CGA were the same in 640x200 mode with a white palette, but the phase of the color burst relative to the pixel clock is different. In that case, it's good to know that Trixter's capture agrees with DOSBox!

                    Comment


                      #25
                      Originally posted by reenigne View Post
                      Oh yeah, you're exactly right. I was thinking that old and new CGA were the same in 640x200 mode with a white palette, but the phase of the color burst relative to the pixel clock is different. In that case, it's good to know that Trixter's capture agrees with DOSBox!
                      Running with an old CGA card will produce some "interesting" results in the second part, see blog for more details.
                      Last edited by Great Hierophant; June 19, 2014, 05:34 PM.
                      My Retro Computing and Vintage Gaming Blog : http://nerdlypleasures.blogspot.com/

                      Comment


                        #26
                        First part of the write-up is done: http://trixter.oldskool.org/2014/06/...mortem-part-1/

                        Second and final part now up: http://trixter.oldskool.org/2014/06/...em-conclusion/
                        Last edited by Trixter; June 20, 2014, 08:32 PM.
                        Offering a bounty for:
                        - A working Sanyo MBC-775 or Logabax 1600
                        - Music Construction Set, IBM Music Feature edition (has red sticker on front stating IBM Music Feature)

                        Comment


                          #27
                          Very interesting stuff! I like the change size ordering bit to solve lack of CPU time.

                          One question though. As delta blocks are dropped, so it becomes steadily more out-of-line - does the encoder cope with that, by redrawing some small percentage each frame for example?
                          Last edited by pearce_jj; June 20, 2014, 03:55 AM.

                          Comment


                            #28
                            I tried the demo on my Tandy TX, and it does work except for the wrong colors in the first half of the demo.
                            My Retro Computing and Vintage Gaming Blog : http://nerdlypleasures.blogspot.com/

                            Comment


                              #29
                              Amazing work! Not just technically, but the video mix itself was very entertaining and built well on the original material.

                              Very cool to see Bad Apple in a new format. Goes next to the Megadrive/genesis version in my youtube playlist

                              Seriously though, congrats on accomplishing this! Eagerly waiting for part two of your post-mortem.

                              Comment


                                #30
                                Really fantastic!

                                Awesome Jim. Love it. This player is much more advanced than corruption and the encoder is much more advanced. It is cool to me how the encoder really evolved to a hand-in-glove kind of fit with the processor instead of a more traditional data-stream / execution stream arrangement. Nice hardware/software harmonic symphony. Sweet.

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