According to the PCI standard, the 4 PCI interrupts can hardwired in various ways. ISA POST cards are 8 bit devices, since POST codes are only 8-bit, which allows for up to 256 different codes. Even with 8xx series Intel chipset designs, we found instances where POST codes were generated, but a PCI diagnostic card did not provide any error codes. In one instance a motherboard came back to life after totally resetting the CMOS settings. In the absence of the ISA bus there is no universal diagnostic port.
Every manufacturer does something different.
For example, some highend mother boards by Epox and ASUS come with built in POST code displays or have a proprietary diagnostic ports for which one can purchase a display unit working only with one manufacturer's products. To sum up, until recently the ISA bus was the lowest common denominator everybody supported. Now, where the ISA bus is being dropped from various designs, there is no universal method other than the PCI bus with the above discussed limitations to extract POST error codes. Also, until we get licenses from other parties we will be unable to offer this product for sale. From there he has fond memories of the Sirius and the Macintosh, but has mostly been involved with IBM compatibles of all shapes and sizes.