IBM RT PC card.

Paul Berger phb.hfx at
Mon Apr 3 06:57:51 CDT 2017

That is the adapter card for connection to a 5080 graphics system.  See 
page 2-47 and 2-48 in manual at

The 5080 system was a high performance graphics processor originally 
hosted by 370 systems but adapters where made to host them on RTs and 
later on RS/6000.


On 2017-04-03 5:56 AM, Mattis Lind via cctalk wrote:
> This card is sitting in a IBM RT PC.
> What kind of card is it? The WD1935 seems to be a SDLC chip. I cannot find
> any reference to the numbers P/N 6247874 (bottom layer etch) or the number
> on the sticker on the backside: 6247871G001
> It is connected to an IBM marked dongle which has 4 BNC connectors.
> Is it a 3278-3279 emulation board?
> /Mattis

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