AT89ISP Cable Schematic Request

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rfdes

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at89isp linux

Hello..
Does anyone have a copy of the ISP cable schematic used by
the Atmel AT89ISP programming software? I would like to make up one
for hobby use and wanted to ask before I attempted to 'reverse-engineer'
the software. Atmel doesn't want to give out the schematic!?
Thanks..
rfdes
 

Here is a design of download cable which capable to program 89xx, 90xx, and pic. You can get rid of extra circuits if you just wanted to program 90xx. It is compatible to pony programmer software and can be downloaded from the web.
 

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