The DSI-32, in Byte Magazine, August 1985, pages 120-136.
Supports the 32032 or 32016. Has 256k bytes of DRAM chips.
Having a 32-bit data bus and dual-ported DRAM made the circuit complicated and the PCB expensive (four layers).
Details
I've extracted the articles from their magazine editions for convenience, then OCR'd and HTML'd them so they can be translated online.