16 Jun
2002
16 Jun
'02
noon
Last year, I acquired an RK05 drive along with a number of
very old RK05 packs with RT-11 files. Since these distribution
are all older than V5.03, they are covered under the Mentec
license which allows usage under the SIMH emulator.
Last week, I was able to borrow an RKV11D Qbus controller
and copy most of the 17 packs (there were a few packs with bad
blocks) with the RT-11 files to a CD. Within a few months, it
should be possible to make these distributions available under
the emulator license, just as V5.03 and V4.00 or RT-11 are now.
In addition, while I still have the loan of the RKV11D, if there
are any users with RK05 media that wish to rescue the files, I
will be able to do so providing the media are still in readable
condition. If the RK05 media are in satisfactory condition and
I only need to read the files once for the COPY and a second
time for the verification (there are no bad blocks), then there
will only be a nominal charge for the destination CD or other
DEC media that I am able to use such as RL02 or TK50 or TK70.
If there are some "difficult" blocks that I am asked to try and
recover, then I will also charge for my time.
Sincerely yours,
Jerome Fine
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16 Jun
16 Jun
12:16 p.m.
Last week, I was able to borrow an RKV11D Qbus
controller
and copy most of the 17 packs (there were a few packs with bad
blocks) with the RT-11 files to a CD. Within a few months, it
should be possible to make these distributions available under
the emulator license, just as V5.03 and V4.00 or RT-11 are now.
Not to complain, but why "within a few months"?
When I picked up the computer that those packs went with, I was
very discouraged to find out that the packs were already gone,
since I spent about $4000 making the trip and didn't wind up with
anything I could boot on it. Sigh.
Anyhow, thanks for reading the packs and I look forward to the
images being available.
Eric
12:51 p.m.
Eric Smith wrote:
Last week, I
was able to borrow an RKV11D Qbus controller
and copy most of the 17 packs (there were a few packs with bad
blocks) with the RT-11 files to a CD. Within a few months, it
should be possible to make these distributions available under
the emulator license, just as V5.03 and V4.00 or RT-11 are now.
Not to complain,
but why "within a few months"? When I picked up the computer that those packs went
with, I was
very discouraged to find out that the packs were already gone,
since I spent about $4000 making the trip and didn't wind up with
anything I could boot on it. Sigh.
I was not sure when I arranged the trip if the RT-11 files would be
carefully preserved!! Now that they are on the way to a CD, I
am confident.
Anyhow, thanks for reading the packs and I look
forward to the
images being available.
You are welcome, how can I help?
Sincerely yours,
Jerome Fine
--
If you attempted to send a reply and the original e-mail
address has been discontinued due a high volume of junk
e-mail, then the semi-permanent e-mail address can be
obtained by replacing the four characters preceding the
'at' with the four digits of the current year.
6:25 p.m.
Eric Smith wrote:
Last week, I
was able to borrow an RKV11D Qbus controller
and copy most of the 17 packs (there were a few packs with bad
blocks) with the RT-11 files to a CD. Within a few months, it
should be possible to make these distributions available under
the emulator license, just as V5.03 and V4.00 or RT-11 are now.
Not to complain,
but why "within a few months"? When I picked up the computer that those packs went
with, I was
very discouraged to find out that the packs were already gone,
since I spent about $4000 making the trip and didn't wind up with
anything I could boot on it. Sigh.
I was not sure when I arranged the trip if the RT-11 files would be
carefully preserved!! Now that they are on the way to a CD, I
am confident.
Anyhow, thanks for reading the packs and I look
forward to the
images being available.
You are welcome, how can I help?
Sincerely yours,
Jerome Fine
--
If you attempted to send a reply and the original e-mail
address has been discontinued due a high volume of junk
e-mail, then the semi-permanent e-mail address can be
obtained by replacing the four characters preceding the
'at' with the four digits of the current year.
17 Jun
17 Jun
2:59 p.m.
Jerome wrote:
Last week, I was able to borrow an RKV11D Qbus
controller
and copy most of the 17 packs (there were a few packs with bad
blocks) with the RT-11 files to a CD. Within a few months, it
should be possible to make these distributions available under the
emulator license, just as V5.03 and V4.00 or RT-11 are now.
I wrote:
Not to complain, but why "within a few
months"?
Jerome Fine replies:
Not to exaggerate the problems, but have you ever used
RT-11? Have you
ever tried to recover files when some of the blocks are bad? The
process is extremely time consuming and requires great patience.
That's fine, wish I could help out. I just misunderstood because I
thought from your original message that you had *already* dumped images
of the packs, so I wasn't clear on the nature of the delay.
Anyhow, having this material available at all will be wonderful, so I
certainly don't intend to criticize. Thanks for going to the trouble
of doing this!
Eric
4:56 p.m.
New subject: DEC QBUS buffers/control chips
Hi list,
Does anyone know of a web resource describing the functionality of the DEC
QBUS interface chips, like the DC003(A), DC004, DC005, DC010, DC021(C) and
others?
I used to have a book on them when I was doing 8031 firmware for a QBUS card
for one company I worked at, but that was 15 years or more ago...
thanks,
greg
18 Jun
18 Jun
9:56 a.m.
New subject: DEC QBUS buffers/control chips
Does anyone know of a web resource describing the
functionality of the
DEC QBUS interface chips, like the DC003(A), DC004, DC005, DC010,
DC021(C) and others?
eventually found a description of the DC003, 004, 005, 006 & 010 in "The
Chipkit Users Guide" on the QBUS IDE project page at
http://www.chd.dyndns.org/qbus_ide/
greg
12:19 p.m.
New subject: DEC QBUS buffers/control chips
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19 Jun
19 Jun
8:29 a.m.
New subject: DEC QBUS buffers/control chips
--- Tony Duell <ard(a)p850ug1.demon.co.uk> wrote:
BTW, the 'example Unibus Interrupt' schematic
in the PDP11 Bus Handbook
that I have is _very_ close to the internal logic of the DC013 chip. The
giveaway is the fact that said example schematic has all external
connections numbered, and those turn out to be the pin numbers of the
DC013.
When Software Results made COMBOARDs, we chose to go with DEC's chips
for that reason - they were debugged and understood and worked. We
used the DC013s for Unibus designs, and the Qbus chipkit for Qbus
designs (VAXBI designs *mandated* the BIIC, so it wasn't optional).
I know we did our own DMA design so I have a pad of DC006 chips, but
we did use the DC010 and DC005 and DC004s (probably the DC003s, too).
I know we also used the 8641 where we didn't use a DEC chip. I _wish_
we'd used some of the older stuff (8881, 384, etc.) even though they
are deprecated, I would have had spares for OMNIBUS machines, etc.
The one disadvantage of DEC's chips was that they were expensive - ISTR
$125/set for Qbus chips at one point. OTOH, for a board that retailed
for $2,000 as a spare (no software license), it's a small percentage,
but it was still one of the most expensive line items after the board
itself.
I know other vendors used things like the 74LS240 for BDAL buffers
on the Qbus. Probably not spec, but it would work for most applications.
We've had this thread before - what reasonable substitutions are. I
was re-reading the Q22 IDE page mentioned earlier this week - he uses
8838 chips to buffer the dual 50-pin cables off of a Q22 extender. I
was thinking of rolling one of these for myself. The problem is, of
course, no VMS driver. Have to roll that, too. :-(
-ethan
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1:06 p.m.
New subject: DEC QBUS buffers/control chips
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