Maybe that is the dhv11. Or the dv11 I'll look it up tomorrow On January 29, 2022 5:12:41 PM EST, Paul Koning via cctalk <cctalk@classiccmp.org> wrote: > > >> On Jan 29, 2022, at 3:58 PM, Noel Chiappa via cctalk <cctalk@classiccmp.org> >> wrote: >> >>> From: Paul Koning >> >>> DH-11 is unusual in that it has DMA in both directions >> >> McNamara's DH11? (I don't know of another DECdevice of that name.) Per: >> >> >> http://www.bitsavers.org/pdf/dec/unibus/EK-ODH11-OP-002_DH11_Asynchronous_16-line_Multiplexer_Users_Manual_Sep76.pdf >> >> it's DMA on output only; the input side has a FIFO that has to be emptied by >> the CPU. > >Oh. That's amazing, all these years I thought it had DMA both ways. Clearly >not. I wonder how I got that misunderstanding. > > paul >
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