This listing is for an I-O DATA PK-A486BL75 CPU upgrade module using an IBM Blue Lightning 486-class processor, rated at 75MHz. This product was originally sold in Japan as part of an I-O DATA upgrade kit for specific NEC PC-98 series systems, but can be adapted to be used in a number of other systems.
The CPU is an IBM Blue Lightning (486BL3 / 486DLC-class) processor, a 486-compatible design intended for use in 386-class systems. These CPUs include on-chip cache and extended 486-style instructions and were commonly used in performance upgrade products during the early-to-mid 1990s.
This CPU was designed for use within an I-O DATA PC-98 upgrade kit. Compatibility with IBM PC/AT systems, clone motherboards, or other platforms is not guaranteed. Successful operation depends on motherboard design, BIOS support, clocking method, voltage requirements, and cache configuration. Buyers should be experienced with vintage hardware and prepared for potential incompatibility. IBM Blue Lightning CPUs are known to support higher clock speeds in some configurations, and examples of overclocked operation exist. Any overclocking is entirely system-dependent and not guaranteed. Stability, cooling, and electrical characteristics are the responsibility of the user.
Includes original drivers on floppy.Fast and careful shipping from Tokyo, Japan.Please be aware of any customs import duties or taxes in your country.
🇺🇸 US buyers: shipments are sent DDP (Delivered Duty Paid), which means there are no duty fees on delivery, as duties are included in the shipping rate.
Please also note that customs delays may occur, particularly within the EU.
This is vintage hardware/software for vintage computers. Use of this item requires era-appropriate knowledge and compatible hardware/software. Please carefully verify your intended use and compatibility before purchasing. I am happy to answer reasonable questions, but compatibility with every system or configuration cannot be guaranteed, and step-by-step installation support is not provided. Issues arising from incorrect installation, modification, or incompatible use are outside the seller’s responsibility.
I usually ship within 24 hours. If shipping falls on a Saturday in Japan, dispatch may occur the following Monday.