19 Nov
2013
19 Nov
'13
4:21 p.m.
Came across this today, patent 6606589
which describes a SMD accellerator that has a SCSI disk connected to
circuitry to simulate an SMD interface through a DRAM buffer, with
schematics.
Pretty late patent, given the technology it was built out of.
21 Nov
21 Nov
7:44 a.m.
On 11/19/13 4:53 PM, Al Kossow wrote:
On 11/19/13 4:21 PM, Al Kossow wrote:
found the brochure at
http://www.thecomputerarchive.com/archive/Storage/Solid%20State/Imperial%20…
and got through the whole patent.
It is actually battery-backed DRAM storage, with the SCSI disk as fallback.
The most interesting thing was the optimization that if read or write gate isn't
asserted after the address header, it asserts the sector
pulse again, skipping the data field rotational latency.
Pretty late patent, given the technology it was
built out of.
ah, now I see.. It's a rehash of
5070474 filed in 1988
I love our patent system.
20 Nov
20 Nov
9:44 a.m.
New subject: modern pdp-11 q-bus storage solution
Hi ALL,
I see many peoples these days want to build own pdp-11 (this is kinda obsession). This
trend results in rise of prices on qbus hardware. The cpu, slu and memory boards are still
affordable, BUT storage adapters/drives prices gone mad (probably forever). I know, there
are some relatively cheap DSSI adapters for the QBUS-vax
machines, they emulate MSCP. So, once being configured on vax processor,
they hypothetically could be used on pdp-11. Also, there are some DSSI->SCSI
converters.
Is it possible to create and configure QBUS DSSI->SCSI (50pin) HDD solution for use
with pdp-11 processor? (What type of QBUS backplane needed? PMI (CD-interconnect) capable
KDJ11 processor? or dual height KDF11 card with simple Q22 would work also?)
I wonder what OTHER options are really exist?
p.s. I know about floppy and tu58 emulators, but those can not replace usual pdp-11 disk
storage in terms of speed/capacity (in case of hacked drivers for high volumes you are
losing compatibility).
11:26 p.m.
New subject: modern pdp-11 q-bus storage solution
I knew someone that ran 11/40s with PR02s and 3s. I found a few quniverters
for him and he put the RP drives on an 11/23. pretty funny if you think
about it.
The inverters are still out there.
On Wed, Nov 20, 2013 at 11:44 AM, Andriy Romanenko <bigral at hotmail.com>wrote:
Hi ALL,
I see many peoples these days want to build own pdp-11 (this is kinda
obsession). This trend results in rise of prices on qbus hardware. The cpu,
slu and memory boards are still affordable, BUT storage adapters/drives
prices gone mad (probably forever). I know, there are some relatively cheap
DSSI adapters for the QBUS-vax
machines, they emulate MSCP. So, once being configured on vax processor,
they hypothetically could be used on pdp-11. Also, there are some
DSSI->SCSI converters.
Is it possible to create and configure QBUS DSSI->SCSI (50pin) HDD
solution for use with pdp-11 processor? (What type of QBUS backplane
needed? PMI (CD-interconnect) capable KDJ11 processor? or dual height KDF11
card with simple Q22 would work also?)
I wonder what OTHER options are really exist?
p.s. I know about floppy and tu58 emulators, but those can not replace
usual pdp-11 disk storage in terms of speed/capacity (in case of hacked
drivers for high volumes you are losing compatibility).
21 Nov
21 Nov
8:25 a.m.
New subject: modern pdp-11 q-bus storage solution
On Wed, Nov 20, 2013 at 9:44 AM, Andriy Romanenko <bigral at hotmail.com> wrote:
Is it possible to create and configure QBUS DSSI->SCSI (50pin) HDD solution for use
with pdp-11 processor? (What type of QBUS backplane needed? PMI (CD-interconnect) capable
KDJ11 processor? or dual height KDF11 card with simple Q22 would work also?)
Sure you could do it starting with one of these for $50 or less, for example:
M7769 KFQSA http://www.ebay.com/itm/160927479769
But then all of the other pieces can add up quickly if you don't
already have them. You need internal DSSI wiring harnesses, or
bulkhead connector kits and external DSSI cables and terminators, plus
DSSI drives or DSSI-SCSI converters.
For fun in the past I have set up a PDP-11 processor (M7554-SD
KDJ11-SD or M8190 KDJ11-B) with an M7769 KFQSA in a BA213 box. Using
a BA213 can make it a lot easier since they often already come with
the internal DSSI wiring harnesses and DSSI drives (example RF31,
RF71, RF72).
You can also use an HSD05 or HSD10 DSSI-SCSI converter instead of a
DSSI drive and I have experimented with that configuration too. But
you'll likely pay more for an HSD05 or HSD10 than the M7769 KFQSA
itself.
If you don't already have the other DSSI pieces you need in addition
to the DSSI controller itself you're probably a lot better in terms of
total expenses just going with a straight Q-Bus SCSI controller. They
aren't that difficult to find nor always outrageously expensive.
-Glen
2:18 p.m.
New subject: modern pdp-11 q-bus storage solution
-----Original Message-----
From: cctalk-bounces at classiccmp.org [mailto:cctalk-
bounces at classiccmp.org] On Behalf Of Glen Slick
Sent: 21 November 2013 16:26
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: modern pdp-11 q-bus storage solution
On Wed, Nov 20, 2013 at 9:44 AM, Andriy Romanenko <bigral at hotmail.com>
wrote:
example:
Is it possible to create and configure QBUS DSSI->SCSI (50pin) HDD
solution for use with pdp-11 processor? (What type of QBUS backplane
needed? PMI (CD-interconnect) capable KDJ11 processor? or dual height
KDF11 card with simple Q22 would work also?)
Sure you could do it starting with one of these for $50 or less, for M7769 KFQSA http://www.ebay.com/itm/160927479769
I have been trying to find one of these in the UK for a long time, I still
haven't found a reasonably priced one.
Regards
Rob
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participants (5)
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aek＠bitsavers.org -
bigral＠hotmail.com -
glen.slick＠gmail.com -
robert.jarratt＠ntlworld.com -
useddec＠gmail.com