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LF631KB PCI/PCI-X 133 MHz Dual RS232 (921kbps) Serial Port + 1 Parallel Port
Softio

LF631KB PCI/PCI-X 133 MHz Dual RS232 (921kbps) Serial Port + 1 Parallel Port

Bottom line: The LF631KB PCI/PCI-X 133 MHz Dual RS232 Serial Port + 1 Parallel Port is a specs-and-price decision rather than a crowd-consensus one in the expansion cards category. Check the specification table below against one or two close alternatives — on price and spec fit, not on star ratings.

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By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014. For retro PC hardware and period-correct parts, synthesises manufacturer documentation, community compatibility lists and marketplace listings rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference.

Pros & Cons

Pros

  • ✓ Bus Speed Support of 33, 66, 100, 133 Mhz at 32 / 64 bits
  • ✓ Backed by Softio's warranty and support channels

Cons

  • ✗ Confirm socket / form-factor / power-rating compatibility against your build before ordering
  • ✗ Price, stock, shipping and returns are set by the retailer and may have changed since this page was last updated

Manufacturer description

FIRST and ONLY add-on 2 serial (16950) + 1 parallel (EPP/ECP compatible) adapter capable of 133 Mhz PCI-X operation. This cutting edge design permits a quick installation of 2 of RS232 serial + 1 of parallel port to any brand of server.

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SpecPicks Verdict

SpecPicks scored LF631KB PCI/PCI-X 133 MHz Dual RS232 Serial Port + 1 Parallel Port using a rating × review-volume × price-fit model applied to published specs and reviews across the expansion cards category. Softio's expansion cards lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for expansion cards of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Key Features

  • Dual (2) High Speed 16C950 Serial + Single (1) Parallel Port for PCI / PCI-X Expansion Slots
  • Bus Speed Support of 33, 66, 100, 133 Mhz at 32 / 64 bits
  • Included Triplex Cable HD44M-DB9M-2 + DB25F (36")
  • 15 kv ESD Surge Serial Port Protection, 30 kv ESD Parallel Port Protection
  • Windows (32 & 64 bit), 2.4.18+ Linux Kernels (32 & 64 bit) with Plug & Play Support, VMWare, OS/2 (Warp 4.0), 5 Year Warranty

Full Specifications

BrandSoftio
StyleClassic
Style NameClassic
Unit Count1 Count
Model NumberLF631KB
CompatibilityLinux
Mfr Part NumberLF631KB
Hardware InterfacePCI

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LF631KB PCI/PCI-X 133 MHz Dual RS232 (921kbps) Serial Port + 1 Parallel Port is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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LF631KB PCI/PCI-X 133 MHz Dual RS232 (921kbps) Serial Port + 1 Parallel Port
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