favorite this post Cubix BC4035 80486 Single-Board Backplane Computer Win 3.1 - $225 (Red Wing) hide this posting unhide


condition: excellent
make / manufacturer: Cubix
model name / number: BC4035
size / dimensions: 80486 DOS Win 3.1

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This is an example of retro computing hardware at its finest! It is a complete single-board ISA-bus computer (manufactured in the USA) that works in a passive backplane. It was removed from a vintage Cubix server. I am including the mating hard drive (with software) and cabling.

Here are the specifics: Intel 66MHz 80486, with 256 kB cache, 16 MB RAM (with one SIMM slot open). On-board: video, floppy, IDE hard-drive, parallel printer, COM port and 10Base-T Ethernet controllers. It also has some nifty POST LEDs.

The hard drive is a 270-MB Western Digital Caviar 1270 which contains MS-DOS 6.22, and Win 3.1. The drive passes a Scandisk surface test. I believe the software is all functional, but make no guarantee about it. An anti-virus program (F-Prot) examines every file and slows the boot process significantly, so I have created an alternative autoexec.bat file (original renamed autoexec.old)

I've refurbised this board as follows:

1. Replaced the Dallas DS12887A battery-backed clock/CMOS setup RAM. These chips are soldered to the PCB and have an internal battery with a nominal 10-year life. I installed the chip in a military-grade socket so future replacement with be a breeze.

2. This board was intended to be used in a “multiplexed” enclosure in which a single Keyboard/Video/Mouse served multiple computers in that enclosure. I solved that problem by reverse-engineering a connector and fabricating an interface that gives a dedicated KVM interface to each board. It provides a standard high-density 15-pin D-shell video connector, along with PS/2-style mouse and keyboard connectors.

There is a wealth of information available about this board at: Retrocomputing dot net
  • do NOT contact me with unsolicited services or offers

post id: 6938241364



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