Gary

You may have had in mind my statement in another thread

Physical as well as electronic considerations impelled DayStar's dedicated adapter for the IIcx, but the SE/30 and IIsi share a PDS electrically, if not the geometric orientation of an attached adapter card. I have two (differing) IIsi/IIci PDS adapters, one of which is more suited to the SE/30 in its shape. Was there a dedicated IIsi/IIci adapter for the SE/30? Or have I misremembered what JDW's monochrome pic. is about?

Click to expand...

I have to disappoint expectations by adding what I did not above: the unsuitably long DayStar IIsi dual adapter (IIci PDS and IIsi PDS), in addition to being a vertical adapter to horizontal cards, has a 68882 socket. The shorter and better-fitting (in an SE/30) is by MicroMac. It is also a vertical-to-horizontal dual PDS-slot card, without a 68882 socket, but the card is scarcely longer than the IIsi PDS connector.

Neither card shows your puzzle-connection, but Unknown_K has advanced as plausible an answer for what you show (if both points are designed as ground-points) as any.

Is your PowerCache card using a 33MHz (2x) or 50MHz (3x) 68030? Could your display problem stem from a 100% or 200% faster delivery of video data by the system to the analogue circuitry?

de