American seller
eBay member for over 20 years

VERY RARE Soyo 25P2 486 AT Motherboard, ISA/VLB, 256K Cache
UPDATED VERSION — Supports 486DX4/100 (see screen captures)
SiS 85C471 chipset, Award BIOS
Manufactured March 1996
CONVERTED TO CR2032
All cables (FDD, IDE, Serial, Parallel) INCLUDED.
FULLY TESTED
GREAT CONDITION!

• We purchased Soyo motherboards directly from Soyo for our own PC production, supplying state/federal government, schools, corporate and professional users.
• This board was removed during a routine upgrade decades ago and has remained unused, packed in protected storage ever since.
• Sold without CPU and RAM so you can configure as you wish.
• Fully tested using Ultra-X professional diagnostics (see test results attached).
• Old NiCd rechargeable battery removed:
  • Power for RTC and CMOS converted to modern CR2032 lithium coin cell.
• CR2032 batteries are cheap, readily available, do not leak, and are quick and easy to replace.
• Charging circuit disabled.
• Reverse current protective diode upgraded to Schottky for extended battery life.
• NO CORROSION.
• Printed copy of original manual with updated jumper settings included.
• Other manuals, jumper settings, info available here:
  https://theretroweb.com/motherboards/s/soyo-sy-025p2
  
• 30 day warranty.

You will receive exactly the item you see in the photos.

Shipped via fast USPS Priority Mail with full tracking. Shipped from a USPS SCF (Sectional Center Facility) so delivery anywhere within the U.S. is only a few days away (excluding the occasional USPS misdirect).

NOTES ON TESTING:
• All low-level core functions are tested with Ultra-X professional diagnostic software specifically designed to test these early motherboards.
• Tests included a burn-in loop of more than 10 minutes (see attached report for list of tests performed).
• Memory slots fully populated so all memory slots are tested.
• For practical reasons, I cannot test every slot, memory combination, processor, header, port, or configuration, etc.

RETURNS:
• Sold with 30 Day Warranty — If the board fails or a defect is found within 30 days of purchase, I will stand behind the product.
• Please contact me with details of any issue so we can resolve the problem or work out an appropriate solution.
• I will provide a reasonable amount of technical assistance if you have questions concerning the configuration or proper use of the item.
• Buyer's remorse returns must be in original condition, in original packaging, and may be subject to a deduction to cover the cost of retesting.
• Generally, the original shipping cost will not be refunded.