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ed12:
hi
i found a few of our flaws in fbr
on newer mobo's the port will not pull up-to 5volt's
and the reset sit's at a steady 3.3vdc
neither of these are of use to us
so let's build the complete power supply part of avrdudess
(the +5/+12 and the 2 transistor stage on the reset line),
this will put these problems to bed
i will be testing shortley

ed

ed12:
ok i was right
in the fbr
open the 3 resistor's that make up the 5v and feed 5v through a dc supply (stable 5v)
the spec of the parrel port states never tie (newer systems olny) 2,3,4,5,6,7,,8,9 toghter
through a resister or not,it is very bad..
reffernce here
>http://www.circlemud.org/jelson/software/parapin/docs/node6.html<
so to get around this we use a seperate 5v supply

ed

Loopey1:
I am running this off a OLD DOS 486 - 100 PC

I have checked the voltages several times. The Main Chip power 2-3-4-9 Through the resistors I get a Solid 5.13 volts. It never fluctuates. (Had meter on it through the test)
The reset line I have 12.55 Volts Switchable Via the M toggle on the Keyboard.

ed12:
yep my old unit will do it that way to.
but we lose the pulse on the reset line "it hold's" steady at 12. which we do not want
on newer board's it will bounce.
but the pull-up's will not get there 5volt for the 5v to pin 20 of the avr they olny climb to 3.3 volt
so i did a hybrd >based on part of what u posted < and refering back to the main schmeatic
of it
with a tweak here and there we are in full test mode >fbr.bat< tweak

q for u
do me a fav with your old box and fbr id the device olny, as i want to do a compare.

ed

Loopey1:
I am using the G42-US-U as my test.
And I get a Device code of 00 01 02 03
IIRC.
I thought it was odd because the AVR should reply with 0x 1e 91 01
But then I read that if the fuse bits are locked you will not get the proper reply???
So I am unsure what is correct.

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