29 Jan
2022
29 Jan
'22
2:12 p.m.
On Jan 29, 2022, at 3:58 PM, Noel Chiappa via cctalk
<cctalk at classiccmp.org> wrote:
Oh. That's amazing, all these years I thought it had DMA both ways. Clearly not. I
wonder how I got that misunderstanding.
paul
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_1…
it's DMA on output only; the input side has a FIFO that has to be emptied by the CPU.