Micronics 80486DX-25/33 EISA (09-00090-xx)
chipChipset
cpuCPU sockets
speedFSB speeds
25MHz33MHz
moboForm factor
AT (max 305 x 330 mm)
dimDimensions
350mm x 304mm
chipCache
64KB128KB256KB
ramMax RAM size
64MB
ramRAM type
30-pin SIMM
pwrPSU connector
connI/O ports
1x 
AT Keyboard
cardExpansion slots
8x 
32-bit EISA

Also known as:

  • Micronics 09-00090-64

Known issues:

  • DALLAS RTC coin cell empty

The motherboard's Real-Time Clock (RTC) chip contains a coin cell that may have drained, causing the loss of CMOS settings. This can result in an inability to save settings, causing system instability or failure to boot. To fix this, the RTC chip can be replaced with an equivalent or repaired by cutting into it and soldering on a new external coin cell holder. Replacement guides are available at https://github.com/necroware/nwX287 or https://github.com/necroware/nw12887, depending on the actual chip used.

Notes:

BIOS shadowing needs to be disabled for any memory configuration using 4MB SIMM modules

Last updated 2022-11-19T21:45:32Z
Score is 8.5/10
2 files available

Vendor: Phoenix [2 entries]

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drv No drivers available
doc 1 board document available
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pwr 1970-01-01
chipdoc 5 chip documents available
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pwr 2022-09-11
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