> 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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