Two 9-pin RS-232 DB9 external serial ports and one DB 25 external parallel LPT port. Parallel interface (LPT). It is easy to allow more serial and parallel devices to be connected to your computer. Serial interface (RS232).
eBay
WiFi 6E Antenna 2T2R 2.4G/5G/6G For Asus ROG B660 H670 M13H Z690 Motherboard Gigabit MSI Asrock PCI-E Network Card Multi Band
Aliexpress UK
Provides two DB9 RS232 ports. Supports RS232, RS485 & RS422 modes. Serial Port On Chip 256 Byte depth FIFOs in Transmit, Receive path of each Serial Port. Serial Port transceiver shutdown support. 5, 6, 7, 8 and 9-bit Serial format Support.
eBay
MONITOR BEZEL OR STAND COLOUR OR DESIGN MAY DIFFER. HOWEVER, THIS DOES'T AFFECT ANY FUNCTIONALITY. SKYTECH SOLUTIONS UK LTD.
eBay
Backward compatibility with PCI software. It is both FCC certified and CE marked, reflecting its compliance with stringent quality standards. What you get.
eBay
The 1-Port Native PCI Express Serial Adapter Card is a computer component designed to expand the serial port capabilities of a computer. This interface/add-on card allows users to easily add a serial port to their system, making it ideal for those who need to connect to legacy serial devices or control equipment with serial communication protocols. Despite being untested, this card is a reliable option for users looking to expand their computer's functionality.
eBay
High Performance Oxford 16950 UART. Selectable power output on pin 9 for the serial port.
eBay
Here we have a PLUSCOM Four Port Internal SATA / Serial Interface card in PCI format. There are THREE Internal SATA Ports, and ONE Internal Serial Port. Driver software is intended for Windows XP. but the item should work with later versions of Windows, with the correct drivers.
eBay
eBay