IBM 4840-xx3 PCI Serial Ports is an IBM-developed device driver package that enables and configures the PCI-based serial ports on IBM SurePOS 300 systems (Type 4840, model xx3). It ensures proper COM port detection, reliable RS-232 communication, and optimized settings for point-of-sale use.
By installing this package, the operating system correctly recognizes the integrated or supported PCI serial controllers, helping prevent conflicts and eliminating “unknown device” alerts. The driver supports multiple port configurations, standard serial parameters (baud rate, data bits, parity, stop bits), and both hardware and software flow control.
Designed for demanding retail environments, it delivers stable connectivity for common POS peripherals, including receipt printers, customer displays, barcode scanners, scales, and payment devices. It is well suited for new deployments, OS reimages, and maintenance updates, helping keep IBM SurePOS 300 terminals dependable and ready for daily operations.
IBM 4840-xx3 PCI Serial Ports is developed by IBM. The most popular version of this product among our users is 1.0. The name of the program executable file is cinst.exe.
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