Features:<br> PCI and ISA 4 digit PCI analyzer:standard PCI and ISA interface,easy access to desktop PC.<br> Standard PCI and ISA interfaces for easy access to desktop PCS.4 digit display,the first 2 digits indicate the current error code,and the last 2 digits indicate the previous error code.<br> After power on self test,the card will quickly display the error code,the provided error code table allows you to easily understand the error details.<br> Compatible with all mainstream motherboards.Support code search function.<br> Support motherboard bus speed test.<br> Hexadecimal character display. Support 80H,84H,300H ports.In the test,press the S1 button for 1 second to start searching,press S1 half a second to start searching until the end,then press the S1 button again for 1 second to start searching,and then press S1 Search the previous error code in half a second until the end.<br> When searching downward, press and hold the S1 button for 1 second to start the bus speed test function. Support self test.<br> During the bus speed test,press the S1 button for 1 second to start the self test function,then press S1 to repeat once every half a second,and then press the S1 button for 1 second to return to the analysis state.<br> Supports AMI,Award, Phoenix and Tandy 300 BIOS.The S1 button can be used for multi-function operation.The speaker can use jumpers and cables.8 LED indicators can be used for +3.3V, +5V, + 12V, -12V, reset, frame, irdy, CLK.<br>