For sale is a Buffalo / MELCO HRX-C12Q CPU upgrade module (PCB marked HRX-12S4-A), made in Japan.
Equipped with a 50MHz IBM 486SLC2 processor and Cyrix 87DLC coprocessor.
This accelerator was designed for NEC PC-9801 VX, RX, UX, EX, and DX series systems.
There are online reports and user blogs suggesting that the HRX-C12Q / HRX-12S4-A may also operate in certain non-PC-98 systems such as IBM PS/2 Model 30 286 and Tandy 1000 TL/2. I have not personally tested it in those systems, and compatibility outside the PC-9801 series is not guaranteed. Buyers intending to use it in non-PC-98 machines should verify compatibility independently.
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.