The is a high-performance PCI Express (PCIe) to parallel port controller chip developed by WCH (Nanjing Qinheng Microelectronics) . It is commonly found on PCIe expansion cards designed to add a legacy IEEE 1284 parallel port (LPT) to modern computers that lack native onboard ports.
Windows 10 and 11 require all drivers to be digitally signed by Microsoft. Older CH351Q driver versions might trigger a Code 52 error. ch351q parallel port driver