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Green PCI card with two DB9 ports and one DB25 port

SMUGDESK

SMUGDESK PCI 2S1P Combo Card MCS9865 2×DB9 RS232 DB25 LPT

SKU CH-XGD5-B04C8

Adds two DB9 RS232 COM ports and one DB25 parallel LPT port via a single PCI slot using the MCS9865 chip

  • Adds two RS232 COM ports and one parallel LPT port via single PCI slot
  • MCS9865 chip provides stable continuous data transmission for connected devices
  • Connects industrial controllers, POS terminals and legacy parallel printers
  • Standard PCI bracket fits traditional desktop chassis for quick installation
  • Windows and Linux drivers included for full system compatibility

Legacy I/O expansion for industrial use

This PCI card adds two DB9 RS232 serial ports and one DB25 parallel port through a single slot. It targets technicians maintaining industrial controllers, point-of-sale equipment and older parallel printers. The MCS9865 chip handles all three interfaces without requiring additional expansion cards. Windows and Linux drivers are included for immediate recognition.

Stable throughput on all three ports

The MCS9865 master chip manages simultaneous traffic across both COM ports and the LPT port without data loss. Each RS232 channel supports standard serial signalling up to 232 kbps for reliable device communication. The parallel interface maintains compatibility with legacy printer timing requirements. Continuous operation is sustained without buffer overruns or port conflicts.

Low-profile bracket fits standard desktop cases

The card draws power directly from the PCI bus and requires no external connector. Passive cooling keeps noise at zero during normal operation. Heat output remains minimal even when all three ports transmit continuously. The standard bracket aligns with conventional chassis cut-outs for tool-free installation.

How it compares

Measured against everything we stock in Interface & Card Adapters, at today’s prices. Recalculated every night.

Price $18.99
Cheaper than about 65% of the 354 comparable items (median $21.99).

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Specifications

No published specifications for this item yet.

Questions about this item

Does the MCS9865 chip generate noticeable heat or fan noise when the card runs all day?

The card is a passive PCI expansion adapter with no fan; the MCS9865 chip draws little power and stays cool under continuous RS232 and LPT traffic.

Which free slot and bracket space must my PC already have for this adapter to fit?

One standard PCI slot and its matching rear bracket opening are required; the card installs directly without extra cables or power connectors.

Will this card work reliably alongside an older motherboard that still uses legacy IRQ routing?

The MCS9865 chip supports standard PCI interrupt sharing, so the two DB9 COM ports and the DB25 LPT port coexist with existing legacy devices under Windows and Linux drivers.

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