New subject: NPR and the RX11 (was Re: help needed: problem with UNIBUS ac cess on my PDP-11/70)

15 Jul 2002

  Hi Ethan.

Yes, the RX11 (M7846) is programmed I/O only.
I checked the RX board yesterday for my NPR problem in the 11/70.
Indeed, the pins CA1 and CB1 are *not* wired on the board ...
back to the 11/70 thread with this result.

- Henk.

...
  -----Original Message-----
 From: Megan [mailto:mbg@TheWorld.com]
 Sent: dinsdag 16 juli 2002 6:19
 To: cctalk(a)classiccmp.org
 Subject: Re: NPR and the RX11 (was Re: help needed: problem 
 with UNIBUS
 access on my PDP-11/70)

 The RX11 isn't DMA... when you give a command, it reads to a 
 silo which
 the driver has to dump, a character at a time, or writes the 
 silo which
 has been written, a character at a time...

 I just checked the RT-11 RX01 driver source to confirm it...

 					Megan Gentry
 					Former RT-11 Developer 