Insufficient current for windows, works in linux

[andstos]

In Linux I can use the arduino IDE to program my UNO board or the 328p chip in a breadboard, via the 6 pin header. In Windows, if I try to program the UNO with the usbtinyisp, I get this error:

avrdude: verification error at byte 0X0000.
etc.etc.

The problem seems that the usbtiny is not supplying enough current for the UNO. If I supply the UNO with an external 5V and remove the ISP jumper JP3, I am able to program successfully in Windows.

There are some cryptic hints about programming the usbtiny to supply more current on the ladyada site, but I am hesitant to program the _original_ firmware into the ATTiny2313, much less make any changes that might be required to it.

Is there anyone that has increased the current allowance of the usbtinyisp, enough to program the UNO without an external voltage supplied?

[adafruit]

its always best to supply external voltages, more stable!

[kscharf]

The ONLY time I've ever used the jumper to have the programmer supply power was to program a stand alone chip in a zif socket. Note that this works ONLY for a banned chip because once you set the fuses for an external clock or crystal it won't work anymore until you supply the external clock or crystal. (In fact the fuses will probably fail to verify once changed!). Still It isn't hard to rig up a zif socket with two caps and a 'rock' to program naked chips that will be used with an external crystal.

[andstos]

Hmm.. yeah that's a good point. External voltages are required anyway for any chip in-circuit, so I guess that makes sense. Thanks for the reality check. Weird that it works in Linux but not Windows, though.