Vintage/Retro motherboard — Soyo 5EAS — AT, ISA/PC, SIMM/DIMM — for REPAIR

Description

Untitled Document
American seller and eBay member for over 20 years.
Soyo 5EAS5 Baby-AT ISA/PCI Socket-7 motherboard, circa 1997.
Supports Pentium-233, AMD K6/2-300, Cyrix MII-300, WinChip-225.
BIOS verified and fresh new CR2032 lithium battery installed.
FAILS TO START:
POST CODE = "00"
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 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).
The complete 43 page manual will be included on CD, plus a printed single sheet jumper settings cheatsheet.
SOLD AS-IS.
NO RETURNS
Soyo 5EAS5 motherboard specifications:
DIMENSIONS — 220mm wide x 230mm.
MANUAL — The complete 43 page manual is provided on CD, plus a printed single sheet cheatsheet of jumper settings.
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.
CHIPSET — ETEQ 6618, introduced in 1997.
Note: this is identical to the VIA Apollo VPX 585/586. The owners of Soyo and VIA were friends and VIA created ETEQ as a private brand exclusively for Soyo. The only difference is the name imprinted on the chip.
BIOS — updated to latest Award BIOS v4.51G version 1B1 dated 11/23/2000.
CMOS BATTERY — Fresh new lithium CR2032 cell installed.
CAPACITORS — All capacitors are in good condition.
This board predates the industry-wide "capacitor plague" of 1999-2007.
PROCESSOR SUPPORT:
Socket 7 — Supports Intel, AMD and Cyrix processors conforming to the below specifications:
Core voltage selections = 2.1, 2.2, 2.8, 2.9. 3.2, 3.3, 3.52v
FSB selections = 50, 55, 60, 66, 75 MHz.
Ratio selections = 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5x.
* Supports Cyrix Linear Burst Mode.
MEMORY SUPPORT:
Supports up to 256MB of at least 70ns access time.
Four 72-pin SIMM sockets (two banks) of 4/8/16/32/64MB FPM, EDO, or BEDO.
One 168-pin DIMM socket for 8/16/32/64/128MB unbuffered FPM, EDO, or SDRAM.
SDRAM memory type cannot be mixed with FPM or EDO
72-pin SIMMs are 32-bits wide, and the Pentium processor data width is 64-bits, therefore each bank requires 2 SIMMs to equal 64-bit data width. The SIMMs in each bank are accessed simultaneously, therefore each bank must be perfectly matched (size, type, make), otherwise instability could result. For example, you could install two 8MB and two 16MB SIMMs to equal 48MB (2x8 + 2x16 = 48).
CACHE:
512K Pipeline-Burst Write-Back SDRAM cache.
SLOTS — the best of both worlds:
3 PCI slots — 32-bit bus-master
4 ISA slots — 16-bit, AT bus compatible
OVERCLOCKING:
Overclocking is easy, if you want to try that.
CPU — the FSB, ratios and voltages are manually selectable for the CPU. Back in this era I regularly overclocked processors, usually to the next step. While some processors are easy to overclock, some cannot be overclocked at all because their labeled speed is already their limit. Overclocking increases heat so it helps to have an appropriate heatsink with thermal compound applied.
MEMORY — The memory timings are automatically set by default, but individual memory latency and timings can be set manually in BIOS.
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). We are lucky to have such a great national postal system and we need to protect it.
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, eBay 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.