7 Nov
2011
7 Nov
'11
1:23 p.m.
David Griffith wrote:
On Mon, 7 Nov 2011, Jules Richardson wrote:
Hmm, thanks for that - that's interesting, because my keyboard's done the
"lock up" thing on a (very small) handful of occasions, too.
Unplugging the converter and plugging it back in has always cured it (until
the next time) and I'd always assumed that it was a mechanical issue - i.e.
that I'd accidentally disturbed cables at the rear of the PC and dislodged
it (the converter's a little bulky so rubs against various other cables,
not to mention that the M's keyboard cable is quite a heavy thing to have
hanging from something that's plugged into a vertical USB socket)
Maybe the fault is related to the occasional "repeated keys" phenomenon,
though.
cheers
Jules
Adam Sampson wrote:
You might want to consider a simple modification that reduces the
current draw. Just add some pullup resistors to the clock and data
lines. I think someone else mentioned this too. See
http://ps-2.kev009.com:8081/ohlandl/keyboard/modify_keyboard/Model_M_Modifi…
for a discussion on that mod. It requests MaxPower 100mA, which is a bit less
than clickykeyboards
claims a Model M actually uses -- but I know the machine I'm using it on
doesn't enforce the USB power requirements anyway, so it should be safe
up to half an amp...
Thanks!
Hmm - I wonder if I can disconnect the +5V line at the keyboard and
supply +5V elsewhere (maybe just tap from the machine's +5V direct),
just to try that for a while and see if the problem goes away (it had
occurred to me that it might be an over-current issue).
I'm not sure if the adapter relies on seeing a current draw (implying
a connected keyboard) for it to function correctly, though...