Diagnostic Card, also named Post Card and Debug Card .It catches the BIOS post code ,then display on digital LEDs, you would soon determine cause of the error by error codes table . Especially when the PC can't boot operating system, or it is a black screen, or the card and motherboard couldn't issue an audible beep. It is a powerful diagnostic tool. Now just use it, you'll get twice the result with half the effort.
Soarland SLDC010 4-Digit PCI/ISA Motherboard Diagnostic Debug Card can fit for both PCI connector motherboard and ISA connector motherboard.

• Both ISA bus and PCI bus are suitable
• Determine defects by difference sounds coding with build-in speaker.
• It can diagnosis the motherboard signal which show the problem of CPU, Memory, video card, etc.
• The POST code display is made up of a dual, dot matrix hexadecimal read-out that display's Power On Self Test (POST) status codes
• Support the power source working indicator -- +5V,+12V,+3.3V and 12V(When indicator LED is on to indicate its respective power is fine, otherwise to indicate its respective power is failure.)
• Fully compatible with any kind motherboards which has the PCI and ISA bus slot.
• Self checking remote display function
• Recall previous post codes at the touch of a button
• Dimentions: 87.2mm x 81.5mm
• Net Weight: 36g