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A complete computer on a board
More intelligent, less expensive
Need more speed? Upgrade to a QM40


Related pages

Controlling multiple projectors
QuadMod32 pinouts

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T he QM32 is a laser-computer-on-a-board. It fits into any PC which can take a full-length ISA bus board. You can use up to four QM32's in a single computer. This means you can run four different projectors (X-Y-color) from one computer.

A complete computer on a board

T he QM32 has its own CPU, 16 MB of memory, and numerous output signals. It handles all frame and show processing. The host PC is only used for storage (hard drive) and for the user interface.
        For example, you could be running a show, your computer (Windows) could crash, and the show would still continue playing. In fact, you could pull the board out of the computer during a show, and if power was still applied to the board, the show would continue running.
  • This is why LD is so reliable. It does not depend on the sometimes-flaky Windows operating system.
  • This is also why you cannot run Lasershow Designer without a QM32 board in the computer. The board holds all the frame and show data. Without a board, you cannot manipulate frames or shows.

More intelligent than D/A boards, less expensive than dedicated computers

The QM32 is 100% designed for laser shows. Here's a list of the many signals that the QM32 controls:
   

Laser projector

   X (horizontal), 16 bits
   Y (vertical), 16 bits
   Z (depth), 16 bits
   Six color channels, 8 bits each
   Beam Brush, 8 bits
   Stereo, 8 bits (for special stereoscopic applications)
   Blanking TTL line
   Visible TTL line (inverted blanking line)
   Shutter TTL line
   
Other devices
   Analog output (for controlling external devices), 8 bits
   Digital input/output (16 TTL lines, can be configured as 8 in/8 out or as 16 out)
   

For a complete list, see the page QuadMod32 pinouts.
   

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B y using the QM32 board, Lasershow Designer avoids problems inherent in other laser graphics systems.
  • Lower cost systems use an inexpensive digital-to-analog conversion board. The D/A board is built for general purpose use, and is adapted for laser use by software or by a small "daughterboard". While certainly cheap, these often have lower-resolution output, such as 12 bits for X and Y coordinates, and 6 on/off bits for color (64 colors maximum, with no fades or shading). In addition, the PC must output all points through the D/A -- 30,000 points every second with at least 5 bytes per point. This means the host PC computer has an extra burden. In some systems, you cannot see the laser output while you draw on the screen. In these systems, the computer also locks up (except for the keyboard) when a show is running.
  • Higher cost systems require you to buy a particular industrial computer. This computer's chassis is usually larger and more expensive than normal PC. The chassis has one or more boards which are full-blown computers. In one system, it runs a custom operating system, in another the boards run under Windows NT. While it is certainly nice to have an entire PC devoted to the laser output, this approach also makes it more difficult to use standard, off-the-shelf computers and accessories. And if you are in the field when a computer goes down, it will be very difficult to quickly get a replacement.

We believe Pangolin has taken the best approach by devoting a computer (the QM32) to laser output, but letting you use whatever PC and accessories you wish. With our approach, you can draw on the computer and see the results on the laser at the same time. You can adjust the show size, speed, position, etc. while it is playing. The laser output speed does not vary with the computer processor's speed.
        By developing the QM32, we give you the best balance of cost, power, and reliability.

Need more speed? Upgrade to a QM40

214x3_gray_column_spacer.gif (846 bytes) F or special applications, Pangolin offers the QM40. This has a faster processor than the QuadMod32. This means it can sustain a higher scan speed (points per second).
        The highest possible scan speed depends on the complexity of the Showtime show being displayed. For simple shows, the maximum scan speed is 80,000 pts/sec for both the QM32 and QM40 (the 80K limit is in software). For "full complex" shows, where Showtime is doing the maximum number of effects, tracks and calculations, the maximum scan speed is 32,000 pts/sec for the QM32 and 40,000 pts/sec for the QM40.
        Fortunately, if you are scanning faster, such as 50K or 60K pts/sec, there is still no problem even with full complex shows! We have added automatic high-speed compensation so shows can be successfully displayed at any speed up to 80K. This works by adding just enough blank points to a "full complex" image, so that the QM has additional computation time. This solution is unnoticeable to most laserists and audience members.
        Automatic high-speed compensation means you can run shows on a standard QM32 using 50K+ scanners, and you will get the full benefit of 50K speeds: reduced flicker and increased graphics detail.
        Thus, most users do not need the QM40. We do recommend it for Pangolin clients who are doing a lot of work with scanners tuned to 50K or more, simply because it gives you 25% more headroom. The QM40 is a $700 option. It can either be ordered at time of purchase, or can be retrofitted if you return your QM32 board.

This page last updated: Friday, February 29, 2008 06:04 AM

 
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