Unique PCI‑E 2x Serial & 1x Parallel multi‑I/O combo card – Single‑slot expansion card that adds 2× RS‑232 serial (DB9) and 1× IEEE 1284 parallel (DB25) ports to a PC, compatible with both PCI and PCI‑Express x1 slots. Based on a 16C550‑class UART, supports standard serial speeds up to 115.2 kbps (some listings quote up to 16 Mbps per port depending on chipset) and parallel modes SPP/EPP/ECP with bi‑directional speeds up to 1.5 MB/s. Includes standard and low‑profile brackets for desktop and slim cases.

Product Overview
The UNIQUE PCI‑1P2S is a multi‑I/O combo card aimed at legacy and industrial systems that still rely on serial and parallel ports—POS terminals, label/barcode printers, CNC/PLC equipment, lab instruments, and older peripherals. It installs into either a PCI or PCI‑Express x1 slot (the listing claims dual compatibility), and exposes two DB9 male RS‑232 serial ports and one DB25 female parallel port on the bracket.

Key Features
- 2× RS‑232 Serial + 1× Parallel – Adds 2 COM ports (DB9) and 1 LPT port (DB25) via one card.
- PCI & PCI‑Express x1 Compatible – Works in legacy PCI and modern PCIe x1 slots (per product description).
- 16C550‑Class UART – FIFO‑buffered serial with hardware flow control and wide driver support.
- IEEE 1284 Parallel – Supports SPP/EPP/ECP modes for printers and legacy devices.
- Bi‑Directional Parallel – Up to ~1.5 MB/s data transfer for fast parallel I/O.
- Standard + Low‑Profile Brackets – Fits full‑height and slim/small‑form‑factor cases.

Specifications
- Model: PCI‑1P2S
- Product Description: Unique PCI‑E 2x Serial & 1x Parallel multi‑I/O combo card
- Bus Interface:
    PCI 32‑bit (3.3/5 V universal)
    PCI‑Express x1 (single‑lane, rev 1.0a) – per listing
- External Ports:
    2× DB9 male RS‑232 serial (COM)
    1× DB25 female IEEE 1284 parallel (LPT)
- Serial Controller: 16C550‑class UART (or equivalent multi‑I/O chipset, e.g., ASIX/MosChip MCS9835 or similar)
- Serial Speed:
    Standard: up to 115.2 kbps
    Some listings/chipsets: up to 16 Mbps per port (depends on exact chipset and driver)
- Parallel Modes: SPP, EPP, ECP (bi‑directional)
- Parallel Throughput: Up to 1.5 MB/s (≈12 Mbps) 
- FIFO:
    Serial: 16–32 bytes (typical for 16C550 class)
    Parallel: 16 bytes (on many combo cards)
- Flow Control: Hardware (RTS/CTS) and software (XON/XOFF)
- OS Support (typical):
    Windows 10/8.1/8/7/Vista/XP (32/64‑bit), Server 2012/2008/2003
    Linux (mainline drivers for common chipsets)
    Legacy: Windows 2000/98SE/95, DOS (chipset‑dependent)
- Bracket Options: Standard (full‑height) + low‑profile bracket included