Indicates the location of pin 1 on adapter card connectors?

Pin 1 on adapter card connectors is typically located at the end of the connector with a notch or a keying feature that ensures proper orientation when inserting the card. In most cases, it is positioned at the top left corner when viewing the connector from the solder side. The pin numbering often follows a specific standard, such as PCI or PCIe, which helps in identifying pin 1 consistently across different types of connectors.