yo,
I just grabbed my new post card from the mail box. The vendor, however betrayed me by 4 status LEDs for OSC , CLK, IRDY asf.. It's only got 4 LED in fact for power 3.3V ... +-5V. I don't think the others are overly useful anyway (only very rare cases). price is a real bargain, no wonder the 3 chips have scratched off labels - I guess it is a product copy to not be copied again.
http://www.shentech.com/stemptpcitop.html
the manual states a different card type which has a button to step through the error numbers manually. Seems it has a little inbuilt memory ? You cannot breakpoint the CPU via PCI-bus, afaik. It also states port 80h, 84h and 300h as standard ports for debug codes. -- Q