In 1990 I was fortunate to attend the World of Commodore trade show in Toronto Canada. The official show guide can be seen here. My best friend from high school was working for Free Spirit Software (booth 237) at the time, and we thought it would be fun if I joined him for the show. I remember walking the show floor and being blown away by a demo that I think was being shown by Great Valley Products (GVP, booth 226) to demonstrate how fast their SCSI controllers were at that point in time. As I recall, they were streaming a full screen animation from the hard drive and playing back the Walt Disney movie, "Snow White and the Seven Dwarfs". I've never seen this demo again and I've never heard anyone talk about it or reference it. I really don't know if it was a 'clip' from the movie or the whole movie; and I wonder about the legality of their demo (as I would guess Disney never 'approved' of the use of Snow White). But I clearly remember seeing it. Does any information exist about this demo or other 'speed demos' done by GVP that might confirm my memory or provide more details?

2 Answers 2


Here's a former GVP engineer talking about streaming the video clips from the Laser Disc game "Dragon's Lair" from one of their hard disks:


Maybe that's what you saw? Dragon's Lair's visuals are somewhat similar to a Disney animated movie after all.

And even if you're sure about the "Snow White" part, the engineer's statement at least confirms that they were doing this exact thing.

  • THAT WAS AWESOME! What a great find. I can't be sure, but I might have actually talked to Mike Thomas back in the day as I ran an AmiExpress BBS. It is definitely possible I saw dragons lair video and simply reassigned it in my fallible human memory - but I was really sure it was Disney. I think I even talked to the people in the booth about how they got 'permission' at the time...
    – Geo...
    Nov 11, 2022 at 1:50

I don't have particular knowledge about that Commodore show or the GVP demo you saw. However, in late 1990, full-screen video playback was common already for many years on stock Amigas. This was demonstrated all the way back in 1986 with the "Juggler" demo. Longer videos required FAST RAM buffers, since the uncompressed (or lightly compressed) frames would quickly eat up the full 512K (A500) to 2M (A3000) of CHIP RAM.

Like the "Juggler" demo, the common use case was with applications like Sculpt 4D. These used ray-tracing to generate photo-realistic animated scenes that could be played back in real-time, though they might take days to generate. Typical resolution was 320x200 HAM mode and the frame rates were in the 24 to 30 fps range.

Doing the same real-time playback from a large video file stored on a SCSI hard-disk would have been an obvious way for GVP to demo the speed of their HD controllers. A typical 8-bit SCSI controller with DMA on an Amiga usually runs at about 2 MiB/sec. Each frame of the video files I am describing would be 48,000 bytes uncompressed (320x200x6 bits/pixel). So a 24 fps video would only need to maintain a throughput of ~1.1 MiB/sec. A DMA SCSI controller pre-loading the data to FAST RAM, then the CPU moving those buffers to CHIP RAM for display, seems quite reasonable. It might have required an accelerator with 32-bit RAM, but GVP was also selling those at the same time.

  • Is it Sculpt 4D or 3D?
    – Joshua
    Nov 8, 2022 at 3:56
  • @Joshua As written on the linked Wikipedia page, Sculpt 4D is the animation version of Sculpt 3D which made still images.
    – jpa
    Nov 8, 2022 at 7:09
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    I have to mention that Juggler is not full motion video so it can't be compared. It is a pre-rendered animation where only small percentage of the image changes between two frames when something moves in the image. Basically similar to what FLIC animation format does.
    – Justme
    Nov 8, 2022 at 9:29
  • 1
    @Justme You are right. Such "compression" formats for animation were pioneered with ANIM on the Amiga.
    – Brian H
    Nov 8, 2022 at 14:01
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    Commodores own A520 SCSI controller could sustain approx. 2.0 Mib/s (by my own measurements) when copying to FastRAM. The GVP controllers were supposed to be slightly faster running close to the theoretical limit of RAM DMA access (about 2.25 Mib/s of I remember correctly)
    – Tonny
    Nov 8, 2022 at 15:36

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