Modern (ATX) power supplies DO NOT provide –5V to Vintage AT motherboards.
Some AT motherboards will give an error on boot if –5V is missing.
Some ISA sound cards require –5V to work properly.
Some ISA network cards require –5V to work properly.

Double ENIG has twice the gold thickness of regular ENIG PCBs.

Dual protection diodes to prevent damage to your precious vintage sound cards!

LED indicators for each ISA voltage.

Enable/Disable jumper for diagnostics.

Copper heatsink integrated into PCB.

High quality German Wurth capacitors.