Not a great thrill but I've made some improved Xilinx Parallel 3 clones if anyone is interested.
Improvements:
R/C followed by Schmitt trigger on TCK
Simple shunt voltage regulator on local power allowing use of HC with approx TTL input thresholds instead of HCT logic so it works reliably with from 2.5V to 5V JTAG VIO
Price $9.95 assembled (no cables) $2.00 bare PCB
Also a simple CPLD card for $9.95 assembled $2.00 bare PCB
XC9572XL-PC44 CPLD
2 x 26 pin I/O connectors - all I/O available
4 speed R/C oscillator
4 buffered LEDS
Optional 48 MHz Xtal OSC add $4 (13.95 assembled)
pushbutton.
Peter Wallace