29 Jan
2022
29 Jan
'22
3:49 p.m.
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 at
classiccmp.org> wrote:
--
Sent from my Android device with K-9 Mail. Please excuse my brevity.
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.