I think its wrong to generalize with the above list; I agree the JDMs (and variants) are not very reliable, to say the least; not to mention the Vpp-before-Vdd issues. However, I have had excellent results with parallel port based programmer(s). I have a generic one that works great, as also an original Epic that with a slight modification, has been working wonderfully. So much so that I have never (till now, at least) been tempted to switch over to a USB programmer.
Regards,
Anand
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