Fast 286 Motherboard with Harris 20Mhz CPU and SIPP memory

Description

This is a very fast 286 motherboard with the above factory speed of 20Mhz. Intel stopped making 286s at 12Mhz but third party chipmakers extended the lifespan of the 16bit chip. Harris was the most succesful in creating 20 or even 25Mhz versions. The latter one is very hard to come by but 20Mhz would be more than enough for any period correct software.
The motherboard has 4 SIPP memory sockets currently populated by 4x256KB modules. The hardware was tested and works fine.
My policy:
I have been collecting vintage PCs, parts and accessories as a hobby for a decade now.
The hardware I’m selling were all tested mostly on the day of the listing or not too much earlier. I take responsibility of their functionality for a reasonable testing period (one week following delivery). If there would be a problem I would either return the money or send a replacement part.
In most cases I have software and electronic documentation for the listed items which I would gladly share.
I provide combined shipping for auctions ending in a few days interval.
The items are safely packaged in antistatic bag, bubble wrap and cardboard boxes taking into account the size and weight of the hardware and the destination country.
I also accept offers. If you think I overpriced something or just want to pay a bit less contact me!
I would gladly answer any questions regarding my listed hardware.