On Sun, Jul 22, 2018 at 8:47 AM, Mark Matlock via cctech <cct...@classiccmp.org> wrote: > Now my question is, there are 3 Bus slots in the 11/84 above the Unibus > map board, would it be possible > to put a dual width Q22 I/O board in the second memory slot (not the PMI side > of the slot) and have it > able to DMA into the MSV11-JE?
The answer I have heard here over and over is that an 11/84 with the UNIBUS adapter and PMI memory does not have a Qbus. As I understand it, the KDJ11-B (M8190) bus protocols change when a KTJ11 (UNIBUS adapter) is present and so what would be expected to be Qbus isn't. Others can probably explain the details and I think there was a DEC Micronote that explained the protocol modifications involved. > Mark -chuck