Message: 1
Date: Sun, 26 Aug 2012 12:12:14 +0100
From: Tony Firshman<t...@firshman.co.uk>
To: ql-us...@q-v-d.com
Subject: Re: [Ql-Users] the heat!
Message-ID:<503a048e.6050...@firshman.co.uk>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Norman Dunbar wrote, on 23/Aug/12 18:37 | Aug23:
On 23/08/12 16:26, Tony Firshman wrote:
I find mine *does* need an external power supply when running some
keyboards.
Yes, the two USB ports are poly-fused to 100mA each. Some keyboards
and/or mice draw more so the fuses kick in and increase resistance (why
am I telling you this?) reducing current. This causes the keyboards to
act like a QL with a dicky membrane, and misses keys or start
auto-repeating at a huge rate.
I have a USB wireless keyboard and mouse for mine, a Perixx Periduo 707
Plus, and it too draws too much from the USB port.
Plugged into the Benq monitor's powered hub, though, it works as good as
it does on my work laptop - both show the same problems such as it hangs
unless I leave it connected after power up, for about 30 seconds - or I
can unplug and replug the wireless dongle to get it working fine again.
Tony
well dont even think about something like the Aienware keyboard I have
on the PC, takes 2 USB ports to fully power it :-)
I suspect the cheaper USB DELL types might be what would work out on the
Pi. They typically accompanied the 'business' class DELL's with small
power supplies inside them.
--
Paul Holmgren
Mine: 2 57 300-C's in Indy
Hers: 05 PT GT R/T HO Stage 1
Hoosier Corps L#6
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