Theoretically the parallel port supplies (sources) _NO_ current
at 5V (or whatever is the precise voltage the logic is supplied).
So you will get _something_ less than 5V. How much less
(at a given current)  depends on the detailed design of the parallel
port silicon (which is pretty much unknown today). There are
programmers which power Atmel chips off several bussed
parallel port pins, but these (Atmel) chips can operate at reduced
voltages. Since you are likely to choose to use the battery and
regulator, I suggest you go ahead and add an e.g. 74HC244
or similar buffer inside the DB25 plug, as the Atmel 'dongle' does.
It will make things more predictable, and can serve as some
protection against dropping  a loose wire with a voltage that will
fry (at least part of ) your PC motherboard.
<The schematic for the Atmel 'dongle' seems to have vanished
from the Web?? But you can design your own singular pinouts.>

R.Martin

Mike M wrote:

> hey guys i built a programmer to program 24lc32 eeproms, i wanted to know if t
he parallel port would have enough current to supply