Anyone ever see a CPU with this identification? Or does anyone know what kind of motherboard this is? Thanks
I inquired about the CPU over on ee.se. The chip appears to be an AMD Am386DX-25.
Compare the lower printed number (
107M7NZ), the fonts used, the logo at the bottom-right, and the laser-etched number (
@njuffa has pointed out that the logo laser-etched at the lower-right is that of Kyocera, the manufacturer of the ceramic package.
As for the board's part number I suspect it's on the white sticker at the top of the board (
620-05211-04/F2 DR00-00022). The top copper layer has something similar etched on it at the top-right (
P/N xxxxx5211-03 where
xxxxx are obscured). That could imply that the board's base part number is
04/F2 being the revision numbers for the top copper layer and the board as a whole, respectively. Unfortunately that part number doesn't show up online anywhere. More photos (especially of the bottom of the board) could be helpful.
Apart from the unrecognized branding on the CPU (ceramic; upper-right in photo) chip, this appears to be a bog standard ISA '386 motherboard, probably running at 25 MHz.
- CPU looks like the right packaging for a 80386
- Empty 80387 FPU socket
- Quadtel "386" BIOS with appropriate late-80s Copyright
- 50.0MHz oscillator adjacent to CPU; usually provided 2x the CPU clock
- Typical VIA chipset
Of course, normal Intel or AMD branding on the CPU chip would make it obvious. I'd be concerned about the provenance of the CPU that is installed.
Going by pinout and socket type it's a pretty generic 80386DX (*1) board based on the VIA FLEX I chipset (SL90xx). Probably 1990/91ish.
It would need a better set of photos - especially of the backside to find some hint. Finding the correct type without further marking is next to impossible, as many did produce following the same layout.
*1 - Visible due the presence of two SL9020 Memory Data Controllers 'below' the CPU - a 386SX would only need a single SL9020.