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It is only that I hate paying for something that should be so simple ...
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The USB-Blaster logic is not particularly complicated. The protocol is documented here:
http://sourceforge.net/apps/mediawiki/urjtag/index.php?title=cable_altera_usb-blaster The developer of UrJTAG reverse-engineered the protocol a while ago, and created FT245+CPLD, FX2, and SiLabs clones. Most of the clones you buy on eBay are based on this source.
As FvM points out, the problem with your other clone could be related to signal integrity. You could probe it with a scope and take a look.
Cheers,
Dave
Honored Contributor
