On Thu, 25 Feb 2021 at 21:32, Rich Alderson via cctalk
wrote:
> As for operating system support, the only DEC operating system which could put
> tapes and disks on the same Massbus was TOPS-20. Tops-10 explicitly tells you
> in the SYSGEN process that disks and tapes must reside on different
On 2021-02-26 9:40 a.m., Lars Brinkhoff wrote:
> Toby Thain wrote:
>> Rich Alderson wrote:
>>> You could ask our friends Keith Perez (Massbus Disk Emulator v1) and
>>> Bruce Sherry (MDE v2) about it, or even ask me. ... produced, and
>>> we had to do something. My brilliant friend Keith sat
On 2/26/2021 8:40 AM, Lars Brinkhoff via cctalk wrote:
Toby Thain wrote:
Rich Alderson wrote:
You could ask our friends Keith Perez (Massbus Disk Emulator v1) and
Bruce Sherry (MDE v2) about it, or even ask me. ... produced, and
we had to do something. My brilliant friend Keith sat down
Toby Thain wrote:
> Rich Alderson wrote:
>> You could ask our friends Keith Perez (Massbus Disk Emulator v1) and
>> Bruce Sherry (MDE v2) about it, or even ask me. ... produced, and
>> we had to do something. My brilliant friend Keith sat down with a
>> logic analyzer and an RP06 attached to a
On 2021-02-25 8:55 p.m., Rich Alderson via cctalk wrote:
> ...
> Hey, Josh! You could ask our friends Keith Perez (Massbus Disk Emulator v1)
> and Bruce Sherry (MDE v2) about it, or even ask me.
> ...
> produced, and we had to do something. My brilliant friend Keith sat down with
> a logic
Rich Alderson wrote:
> As for operating system support, the only DEC operating system which
> could put tapes and disks on the same Massbus was TOPS-20. Tops-10
> explicitly tells you in the SYSGEN process that disks and tapes must
> reside on different channels; I believe that ITS follows that
> Date: Thu, 25 Feb 2021 12:37:25 -0800
> From: Josh Dersch via cctalk
> On Thu, Feb 25, 2021 at 12:27 PM Al Kossow via cctalk
> wrote:
>> On 2/25/21 10:43 AM, Chris Zach via cctalk wrote:
>>> Oh this is fun stuff. Is there a specification write-up anywhere on the
>>> MASSBUS overall?
>>
On 2/25/2021 1:37 PM, Josh Dersch via cctalk wrote:
On Thu, Feb 25, 2021 at 12:27 PM Al Kossow via cctalk
wrote:
On 2/25/21 10:43 AM, Chris Zach via cctalk wrote:
Oh this is fun stuff. Is there a specification write-up anywhere on the
MASSBUS overall?
there is some documentation on
> On Feb 25, 2021, at 4:15 PM, Al Kossow via cctalk
> wrote:
>
> On 2/25/21 12:37 PM, Josh Dersch wrote:
>
>> Interesting... Is this obfuscation documented anywhere (beyond looking at
>> SIMH code?)
> Not that I know of. Thinking about it some more I think that it was the
> massbus device
On 2/25/21 12:37 PM, Josh Dersch wrote:
Interesting... Is this obfuscation documented anywhere (beyond looking at SIMH
code?)
Not that I know of. Thinking about it some more I think that it was the massbus
device addresses
behind the controllers that weren't documented
On Thu, Feb 25, 2021 at 12:27 PM Al Kossow via cctalk
wrote:
> On 2/25/21 10:43 AM, Chris Zach via cctalk wrote:
> > Oh this is fun stuff. Is there a specification write-up anywhere on the
> MASSBUS overall?
>
> there is some documentation on bitsavers
>
> the register descriptions were
On 2/25/21 10:43 AM, Chris Zach via cctalk wrote:
Oh this is fun stuff. Is there a specification write-up anywhere on the MASSBUS
overall?
there is some documentation on bitsavers
the register descriptions were intentionally obfuscated to prevent cloning
that was figured out to make SIMH
In answer to my own question: No it does not based on a bit of review.
Looks like unique cards to the 11/70.
C
On 2/25/2021 1:43 PM, Chris Zach via cctalk wrote:
Oh this is fun stuff. Is there a specification write-up anywhere on the
MASSBUS overall?
For example I wonder if the RH70 could
That is at least one RH11-AB in there, minus the knucklebusters of course.
On 2/25/2021 1:49 PM, Bill Degnan wrote:
On Thu, Feb 25, 2021 at 1:43 PM Chris Zach via cctalk
mailto:cctalk@classiccmp.org>> wrote:
Oh this is fun stuff. Is there a specification write-up anywhere on the
The PDP-10 KL10 at the RCS/RI was used to control a real-time flight
simulator at Sikorski. It had one of the RH20 Massbus controllers connected
to a DTR01 cabinet holding a DR01 chassis. The DR01 was, I think, connected
to a DR11 chassis that had A/D and D/A converters boards inside. You could
> On Feb 25, 2021, at 1:43 PM, Chris Zach via cctalk
> wrote:
>
> Oh this is fun stuff. Is there a specification write-up anywhere on the
> MASSBUS overall?
>
> For example I wonder if the RH70 could do a transfer >128kb at a time. ...
I don't know the answer to most of your questions,
On Thu, Feb 25, 2021 at 1:43 PM Chris Zach via cctalk
wrote:
> Oh this is fun stuff. Is there a specification write-up anywhere on the
> MASSBUS overall?
>
> For example I wonder if the RH70 could do a transfer >128kb at a time.
> Another is around the RH11: There were two models, the
Oh this is fun stuff. Is there a specification write-up anywhere on the
MASSBUS overall?
For example I wonder if the RH70 could do a transfer >128kb at a time.
Another is around the RH11: There were two models, the traditional RH11
(which could only do so many words on a DMA transfer) and the
> On Feb 25, 2021, at 1:30 PM, Noel Chiappa via cctalk
> wrote:
>
>> From: Paul Koning
>
>> There's a good reason why the big disks on many DEC machines were Massbus
>> devices until MSCP arrived. It's quite clear on Unibus PDP-11s, which
>> needed Massbus both for speed and for a cleaner
> From: Paul Koning
> There's a good reason why the big disks on many DEC machines were Massbus
> devices until MSCP arrived. It's quite clear on Unibus PDP-11s, which
> needed Massbus both for speed and for a cleaner answer to more-than-18
> bit addressing.
I follow the
> On Feb 25, 2021, at 2:40 AM, Eric Smith via cctalk
> wrote:
>
> On Wed, Feb 24, 2021 at 7:06 AM Chris Zach via cctalk
> wrote:
>
>> Yes, the TM02 and TM03 formatters allowed MASSBUS to connect to Pertec
>> drives, but I don't think you could run a tape drive and a disk drive on
>> the
On Wed, Feb 24, 2021 at 7:06 AM Chris Zach via cctalk
wrote:
> Yes, the TM02 and TM03 formatters allowed MASSBUS to connect to Pertec
> drives, but I don't think you could run a tape drive and a disk drive on
> the same MASSBUS channel anyway. Wonder why, technically the MASSBUS
> cable is just
> On Feb 24, 2021, at 7:06 PM, Noel Chiappa via cctalk
> wrote:
>
>> From: Chris Zach
>
>> technically the MASSBUS cable is just an extension of the Unibus
>
> No.
>
> For one thing, the MASSBUS has no lines for carrying memory addresses. So
> there is no way to even build a box that
> From: Chris Zach
> technically the MASSBUS cable is just an extension of the Unibus
No.
For one thing, the MASSBUS has no lines for carrying memory addresses. So
there is no way to even build a box that 'translates' MASSBUS to UNIBUS; the
semantics ('the things you can say',
Do you have 3-phase power? Will they even spin up?
I do, but I don't care enough about them to try.
I just want them gone. Bring your own fork lift, the battery in mine is dead
and they are 15 feet up.
> On Feb 24, 2021, at 9:06 AM, Chris Zach via cctalk
> wrote:
>
>> I happen to have a massbus adapter and the cabling with terminator for my
>> 11/750, but I never came across any massbus peripherals. Considering the
>> price back then and the size for these, they seem nowadays quite rare,
On 02/24/2021 12:26 PM, Al Kossow via cctalk wrote:
I have two RP07s sitting on the upper mezanine here that
were left behind by the former tennant of the
building my shop is in.
Do you have 3-phase power? Will they even spin up?
Jon
I have two RP07s sitting on the upper mezanine here that were left behind by
the former tennant of the
building my shop is in.
Well, I had a
program that could examine the home blocks, and I knew where to find the
backup home blocks. So, I hacked that program to copy the backup block
to the main one, and then change the checksums to agree.
That is one way to avoid a very long restore :-)
The other issue is the
Yep. I actually had one. The lid flew off the top of it while we were
driving it back from Eastern shore to Baltimore on Rt. 50 but the rest
of it was intact. Very different MBA controller from an RM02/03.
Unfortunately when Doug closed up the storage place someone swiped MC
from there before
On 2021-02-24 11:06 a.m., Jon Elson via cctalk wrote:
> On 02/24/2021 08:06 AM, Chris Zach via cctalk wrote:
>>
>> Sort of. MASSBUS was a very overpriced and to be honest weird system
>> that DEC developed in an attempt to be like IBM and charge very high
>> markups for generic peripherals.
On 02/24/2021 08:06 AM, Chris Zach via cctalk wrote:
Sort of. MASSBUS was a very overpriced and to be honest
weird system that DEC developed in an attempt to be like
IBM and charge very high markups for generic peripherals.
While it did support a variety of interface formats (I
don't think
I happen to have a massbus adapter and the cabling with terminator for my
11/750, but I never came across any massbus peripherals. Considering the price
back then and the size for these, they seem nowadays quite rare, which is a
real pity.
Sort of. MASSBUS was a very overpriced and to be
Am Mittwoch, 24. Februar 2021, 03:53:19 MEZ hat Chris Zach via cctalk
Folgendes geschrieben:
>Wow, I've always wanted an 11/750. Not sure why, the small box size is
>impressive and all that. However it doesn't look like that one has a
>MASSBUS adapter so I will have to pass...
>
>And I
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