18 Oct
2016
18 Oct
'16
6:39 a.m.
From: Paul Birkel
Maaaaaybe there are three ribbon cables back there
Sure looks like it, and running to a standard MASSBUS connector, to boot.
(Not that I have any use for the latter - absolutely no MASSBUS cables at
all. But one could just run flat cables from this, to one's RH11/RH70.)
I don't see a second MASSBUS connector, wonder what they do about
termination? Maybe it's onboard? So I guess one could only have one
of these things per MASSBUS port? Not really a problem, of course! ;-)
We _definitely_ need to put these things in 'production'.
Noel
18 Oct
18 Oct
8:33 a.m.
On Tue, Oct 18, 2016 at 9:39 AM, Noel Chiappa <jnc at mercury.lcs.mit.edu> wrote:
I would consider one for my VAX/11-750 since Unibus disk emulation
solutions aren't plentiful (but I think I'd have to get a DR750
(L0014) first).
-ethan
From: Paul
Birkel
Maaaaaybe there are three ribbon cables back
there
We _definitely_ need to put these things in 'production'.
12:03 p.m.
On Tue, Oct 18, 2016 at 11:33 AM, Ethan Dicks <ethan.dicks at gmail.com> wrote:
I would consider one for my VAX/11-750 since Unibus
disk emulation
solutions aren't plentiful (but I think I'd have to get a DR750
(L0014) first).
Correction: RH750 (L0007). The DR750 is a CMI-bus "interprocessor interface".
-ethan
9:05 a.m.
On 10/18/16 6:39 AM, Noel Chiappa wrote:
I can shed a
bit of light here. There are two components involved. On
the emulation end, there is a PCI card with an FPGA that implements the
interface logic; and there is software on a PC that deals with device
logic and storage. Between the PC and the MASSBUS interface on the host
machine, there is a driver/receiver board that adapts signal levels
between MASSBUS and the FPGA.
From: Paul
Birkel
Maaaaaybe there are three ribbon cables back
there
Sure looks like it, and running to a standard MASSBUS connector, to boot.
(Not that I have any use for the latter - absolutely no MASSBUS cables at
all. But one could just run flat cables from this, to one's RH11/RH70.)
I don't see a second MASSBUS connector, wonder what they do about
termination? Maybe it's onboard? So I guess one could only have one
of these things per MASSBUS port? Not really a problem, of course! ;-)
We _definitely_ need to put these things in 'production'.
Agreed.
- Josh
Noel
2939
days inactive
2939
days old
3 comments
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jnc＠mercury.lcs.mit.edu