Is the BBB not fast enough to do Qbus? Meaning, for qbus, would a FPGA be necessary? Or
was this just the op's choice among many possible options?
It does seem useful to have this thing run linux and ethernet and be able to pass files
(data and programs) back and forth very easily. the FPGA approach seems more technically
challenging but seems less universal (to my limited mind). It would seem a BBB you could
load software, test, and reload as easily as copying some executable code (I dont know if
that is correct or an over simplification). whereas the FPGA sounds like it needs to be
recompiled/re-burned each time?
I dont know whether an RPi could work or if the BBB is needed for speed etc.
Eugene
________________________________________
From: cctalk <cctalk-bounces at classiccmp.org> on behalf of J?rg Hoppe via cctalk
<cctalk at classiccmp.org>
Sent: Saturday, November 16, 2019 12:45 PM
To: Stefan Skoglund; General Discussion: On-Topic and Off-Topic Posts; General Discussion:
On-Topic Posts
Subject: Re: UniBone: Linux-to-DEC-UNIBUS-bridge, year #1
Stefan,
*What it is:*
In case you forgot: UniBone is a plugin board to DEC PDP-11 UNIBUS
systems containing a BeagleBone Black.
See
http://retrocmp.com/projects/unibone.
This combo can simulate PDP-11 devices embedded in a physical
machine.
So you can operate and repair incomplete UNIBUS PDP-11s and even
VAXes,
just by emulating the missing parts.
Disk drive emulators accept SimH image files, which can be ftp'd to
the
emulator (no SDcard changing!).
Ethernet or FC connection ??
If so it would be possible to build an PDP-11 who is datacenter-
compatible today year 2019 ...
One requirement for todays datacenter (for some owners at least) is the
ability to directly connect the system to the storage system (ie
FC/SCSI or IP/iSCSI.)
Hint: with that requirement as far as i know it an ARM device in the
form of a Samsung S9 can't be data center compatible....
Mot clear to me what
"data center compatibility" for a PDP-11 means.
Anyhow, the BeagleBone runs Debian Linux, has an Ethernet port and the
emulation software is a plain Linux application.
So all emulator binaries and all PDP-11 disk images or other data can
reside anwhere in the world and are not bound to the UniBone SDcard.
Joerg