Vintage 486 motherboard— SiS-496/497 Soyo 4SA, AT, ISA/PCI — For REPAIR For Sale

Vintage 486 motherboard— SiS-496/497 Soyo 4SA, AT, ISA/PCI — For REPAIR


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Vintage 486 motherboard— SiS-496/497 Soyo 4SA, AT, ISA/PCI — For REPAIR:
$24.97

Untitled Document

American seller and member for over 20 years.

Vintage Soyo 4SA motherboard, circa 1995,
Supports almost every 486 processor speed, make and model.
New NiMH rechargeable battery installed.
BIOS verified and updated to latest version (programmed externally using a professional EPROM programmer and verified in a working motherboard).

POST Code = 4E
\"Keyboard error or no keyboard present\" (see screen capture).
\"CMOS checksum error\" likely due to being unable to use keyboard to enter setup.
Otherwise, appears completely stable.
A cursory visual shows no apparent problem, but I don\'t have the time to investigate further.
Many people enjoy the challenge of troubleshooting vintage motherboards, so I\'m offering this nice 486 motherboard specimen for those who would enjoy finding and resolving the issue.
This board was removed during a routine upgrade decades ago and has remained unused, packed in storage since then (see Background note below).

  • MANUAL —
    • High-quality, high-resolution scan of the complete 35 page original manual is provided as PDF on CD.
    • The hardware configuration of vintage motherboards is via jumper settings, so having the full manual with jumper settings is critical for nearly all vintage motherboards (jumpers are properly set for configuration as tested). This motherboard has lots of jumpers to provide support for all the processor types it supports, so the manual is especially critical for this board.
  • You will receive exactly the item you see in the photos
  • SOLD AS-IS.
  • NO RETURNS
  • This board was removed during a routine upgrade decades ago and has remained unused, packed in storage since then (see Background note below).

Soyo SY-4SA motherboard:

  • Soyo, based in Taiwan, was a leading motherboard brand at the time (no longer extant).
  • CHIPSET — SiS 496/497, introduced in 1995.
  • BIOS — updated to latest Award BIOS v4.51G version SA-0730 dated 7/30/1997.
  • CMOS BATTERY — Fresh new high-quality NiMH rechargeable battery installed
    • Unlike the leaky NiCd rechargeables from this era, NiMH almost never leaks. You can expect 10+ years lifetime from this battery.
  • CAPACITORS — All capacitors appear to be in good condition.
    • This board predates the industry-wide \"capacitor plague\" of 1999-2007.
  • SLOTS — the best of both worlds:
    • Four 32-bit bus-master PCI slots - three bus mastering, one VESA slave.
    • Four 16-bit ISA slots.
  • PROCESSOR SUPPORT
    • Supports almost every 486 processor speed, make and model:
    • intel 486SX, SX2, DX, DX2, DX4
    • AMD SX, DX, DX2, DX4, SL
    • Cyrix/IBM DX, DX2
    • UMC U5S
    • Core voltage selections = 3.45, 3.6, 4.0, 5v.
    • FSB selections = 25. 33, 40, 50 MHz.
    • Ratio selections = 1, 2, 3x.
  • MEMORY SUPPORT
    • Fast page burst-mode controller.
    • Up to 256MB of 72-pin SIMMs of at least 80ns access time.
    • 1, 2 4, 8, 16, 32 and 64MB SIMMs supported.
    • Supports FPM (Fast Page Mode) memory, with or without parity.
  • CACHE
    • 256K direct map SDRAM cache.
  • BUILT-IN I/O
    • Floppy controller.
    • IDE controller supports up to 4 IDE drives.
    • IBM-compatible parallel port.
    • Two RS-232C serial ports.
  • A very clean and functional vintage motherboard great for anyone wanting to play around with vintage technologies or play retro games..

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).

Background: I built my first computer with a soldering pencil in 1977, then founded a computer company in 1979 selling Zenith, Kaypro and Morrow computers. In 1984 we began manufacturing our own PC clones designed for quick and cost-effective component upgrades, winning multi-year contracts selling our computers to corporate and government agencies. To keep our upgrade program prices low, we allowed credit for the removed components. Consequently, I ended up with a warehouse full of vintage computer components, all safely boxed and undisturbed for decades. Now is the time to retest and offer these vintage components to retro gaming and vintage computer enthusiasts, and collectors. It will take years to get all this stuff listed, so watch for new listings.

Note: Please do not enter a message on your purchase form because I\'ll probably never see it. For some reason, no longer includes buyer messages in the \'Notice of Item Sold\' email they send to sellers. If you have a message or question, please send it separately via the \'Contact Seller\' link and I will respond promptly.



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