On Jul 14, 2005, at 1:45 PM, David W. Fenton wrote:
On 14 Jul 2005 at 1:20, Darcy James Argue wrote:
On 13 Jul 2005, at 10:19 PM, Rocky Road wrote:
Are you sure about this? MIDI's 1980 technology is so slow
Not *that* slow.
Right, and the issue is not the amount of data that MIDI produces,
but coordination of the MIDI data with the QWERTY keyboard data.
Or are you saying that using a Qwerty keyboard, mouse, scanner,
digital camera, etc on USB alongside MIDi is creating a data
bottleneck?
Yes. Especially if you use a hub.
That would suggest that each USB device adds its own timecode to the
data. If it didn't, the hub shouldn't be causing any bottlenecks,
because in computer terms, there really *isn't* much data involved.
I'm wondering if Chris tested plugging the MIDI adaptor into one of
the ports on the PC, not into a hub, or plugging both the QWERTY
keyboard and the MIDI adaptor into the hub, and if that made any
difference.
I don't have a hub. All I have (right now) is my MIDI interface plugged into one of the two available USB ports in the back of the Mac G4, and my keyboard plugged into the USB port for that purpose on the back of my Apple Cinema Display. There are two USB ports on the keyboard; my mouse is plugged into one of them. The keyboard USB cable is too short to plug into the computer directly without an extension, unless the computer is on the table beside me (crappy design, IMHO).
My printer and cable modem are connected through AppleTalk Ethernet.
I checked, and the only FireWire MIDI interfaces around have audio included. Apparently, USB (even 1.0) is quite a bit faster than MIDI, so nobody feels like they should make a dedicated FireWire MIDI interface.
Here is my info from Apple System Profiler.
The first item is the internal bus, which distributes to the second item ("Hub") and the last item, which is my MIDI interface plugged into the computer. So apparently there are TWO possible routes on ONE bus (three if I used the other port in the back of the computer).
<x-tad-smaller>USB Bus:
</x-tad-smaller><x-tad-smaller> Vendor Name: Apple Computer, Inc.
Product ID: 32773 ($8005)
Speed: Up to 12 Mb/sec
Bus Power (mA): 500
</x-tad-smaller><x-tad-smaller>
</x-tad-smaller><x-tad-smaller> Hub:
</x-tad-smaller><x-tad-smaller> Product ID: 37145 ($9119)
Speed: Up to 12 Mb/sec
Bus Power (mA): 500
Vendor ID: 1452
</x-tad-smaller><x-tad-smaller>
</x-tad-smaller><x-tad-smaller> Studio Display:
</x-tad-smaller><x-tad-smaller> Speed: Up to 1.5 Mb/sec
Product ID: 37401 ($9219)
Bus Power (mA): 500
Vendor ID: 1452
</x-tad-smaller><x-tad-smaller>
</x-tad-smaller><x-tad-smaller> Hub in Apple Extended USB Keyboard:
</x-tad-smaller><x-tad-smaller> Vendor Name: Mitsumi Electric
Product ID: 4098 ($1002)
Speed: Up to 12 Mb/sec
Bus Power (mA): 500
</x-tad-smaller><x-tad-smaller>
</x-tad-smaller><x-tad-smaller> USB Receiver:
</x-tad-smaller><x-tad-smaller> Vendor Name: Logitech
Speed: Up to 1.5 Mb/sec
Product ID: 50445 ($c50d)
Bus Power (mA): 100
</x-tad-smaller><x-tad-smaller>
</x-tad-smaller><x-tad-smaller> Apple Extended USB Keyboard:
</x-tad-smaller><x-tad-smaller> Vendor Name: Mitsumi Electric
Speed: Up to 12 Mb/sec
Product ID: 516 ($204)
Bus Power (mA): 250
</x-tad-smaller><x-tad-smaller>
</x-tad-smaller><x-tad-smaller> USB Device:
</x-tad-smaller><x-tad-smaller> Speed: Up to 12 Mb/sec
Product ID: 4129 ($1021)
Bus Power (mA): 500
Vendor ID: 1891
Christopher
</x-tad-smaller>
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