8 Oct
2007
8 Oct
'07
5:28 p.m.
Subject: MFM or ESDI QBUS controller for one PDP-11/23 PLUS
From: "Sergio Pedraja" <spedraja at gmail.com>
Date: Mon, 08 Oct 2007 18:56:57 +0200
To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at
classiccmp.org>
Hello.
As the subject say, I'm searching for one working MFM (not RQDx, better
something like the Andromeda UDC) or ESDI QBUS controller plus cables to use
with one PDP-11/23 PLUS. The ESDI would be a better choice because I have
one 300 Mb HD and one 700 Mb HD, both of full-height (in the terms used with
old PeeCee's).
I'm perplexed. The RQDXn controllers are MFM and Floppy. Best shot
is late firmware RQDX3 as it does RX33 and most all MFM drives. Its
also easier to find.
Allison
I have too a couple of RX33 floppies but no controller for them. I would
appreciate to obtain one.
Finally, I am thinking in use one old PC enclosure for disks and floppies.
Someone has did it ? Results ?
Can contact privately with offers.
Thanks and Greetings
Sergio
9 Oct
9 Oct
2:57 a.m.
Hi, Allison.
I'm perplexed. The RQDXn controllers are MFM and Floppy. Best shot
is late firmware RQDX3 as it does RX33 and most all
MFM drives. Its
also easier to find.
At least as I can remember, the RQDx3 needs an internal distribution panel.
I'm searching for ONE single board.
Thanks and Greetings
Sergio
8:51 a.m.
Sergio Pedraja wrote:
Hi, Allison.
I'm perplexed. The RQDXn controllers are MFM and Floppy. Best shot
Jerome Fine replies:
Then perhaps you can describe your other hardware - backplane
with power supply. Do you have a BA23 or a BA11 box? Or
something else? What about the serial ports, etc.?
I agree that the RQDX1, RQDX2 and RQDX3 require a distribution
panel of some sort to change from the 50 pin cable to the
34 pin / 20 pin cable required by MFM hard drives and floppy
drives. That panel is usually part of a BA23 box. A BA123 box
uses a distribution board which can handle 4 drives, but the
hard drives also require an additional READY / WRITE PROTECT
(very small) panel.
As far as I can remember, the only controller that I have
ever used with an RX33 was a DEC "late firmware RQDX3" as
Allison has noted.
Probably a 3rd party controller like the Dilog DM01 is what
you are looking for. But I suspect that these days, an RQDX3
is probably more easily found - except for that internal
distribution panel which is also required if you are using
a BA11 box.
Let us know about your other hardware so that we can help a
bit more.
Sincerely yours,
Jerome Fine
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is late firmware RQDX3 as it does RX33 and most
all MFM drives. Its
also easier to find.
At least as I can remember, the RQDx3 needs an internal distribution panel.
I'm searching for ONE single board.
9:37 a.m.
Hi, Jerome:
Then perhaps you can describe your other hardware - backplane
with power supply. Do you have a BA23 or a BA11 box?
Or
something else? What about the serial ports, etc.?
The PDP-11/23-PLUS comes in one BA11. I have another BA11 plus the boards to
connect both, but this is not important for this matter, I think.
I have too one PDP-11/53 ( not sure at all) who uses one BA23. It's state is
not good in excess, but I don't want to dismantle it... by now.
I agree that the RQDX1, RQDX2 and RQDX3 require a distribution
panel of some sort to change from the 50 pin cable to
the
34 pin / 20 pin cable required by MFM hard drives and floppy
drives. That panel is usually part of a BA23 box. A BA123 box
uses a distribution board which can handle 4 drives, but the
hard drives also require an additional READY / WRITE PROTECT
(very small) panel.
Probably a 3rd party controller like the Dilog DM01 is what
you are looking for. But I suspect that these days, an RQDX3
is probably more easily found - except for that internal
distribution panel which is also required if you are using
a BA11 box.
Well, this is something :-) I didn't hear about the DM01 previously. This is
helpful, but I accept pleasantly other suggestions and, of course, any offer
about items like this one (for example). Don't forget the ESDI option that
I've mentioned previously.
And, of course, we ever have the option of one SCSI board, but I am not sure
about what was the better option for one QBUS PDP. QMD Perhaps ? I have too
one SCSI Hard Disk but not sure even if it works :-)
Thanks and Greetings
Sergio
1:20 p.m.
I'm perplexed. The RQDXn controllers are MFM and
Floppy. Best shot
is late firmware RQDX3 as it does RX33 and most
all MFM drives. Its
> also easier to find. At least as I can remember, the RQDx3 needs an
internal distribution panel.
I'm searching for ONE single board.
It doesn't exactly _require_ a distribution panel ,
it's a simple matter to make a cable to go from an
RQDX3 to the drives without using the distribution
bulkhead inside a DEC enclosure.
See this site for pinouts and details:
http://home.alltel.net/engdahl/rqdx3.htm
-Ian
1:38 p.m.
Hi, Ian:
2007/10/9, Mr Ian Primus <ian_primus at yahoo.com>:
See this site for pinouts and details:
http://home.alltel.net/engdahl/rqdx3.htm
-Ian
Mmm... I see. I should need to construct this elemental circuit, but I must
confess my null experience with it... Fortunately I got help :-) But I must
translate to spanish this page for the helper... And perhaps clear some
points of the text, now that I'm reading it more in deep.
With independence of this, my request for one board if available continues.
Thanks and Greetings
Sergio Pedraja
11 Oct
11 Oct
2:53 p.m.
On Tue, 9 Oct 2007 10:20:37 -0700 (PDT)
Mr Ian Primus <ian_primus at yahoo.com> wrote:
See this site for pinouts and details:
RQDX3
Dist Panel from BA23:
J1: Fixed Disk 1 Control (34 pin)
J2: Fixed Disk 0 Data (20 pin)
J3: RQDX3 (50 pin)
J4: Control Panel (10 pin)
J5: Fixed Disk 1 Data (20 pin)
J6: Removable Disk (34 pin)
J7: Fixed Disk 0 Control (34 pin)
RQDX3 J3 J1/J7 J6 J2 J4 J5
50 1 22 34
49 2 GND
48 3 14 32
47 4 GND
46 5 30
45 6 GND
44 7 1
43 8 8
42 9 10 26
41 10 GND
40 11 6 24
39 12 GND
38 13 22
37 14 GND
36 15 24 20
35 16 GND
34 17 34 18
33 18 GND
32 19 16
31 20 7
30 21 30 14
29 22 28 12
28 23 26 10
27 24 6
26 25 20 8
25 26 GND
24 27 32 6
23 28 2
22 29 2 2
21 30 GND
20 31 18
19 32 17
18 33 14
17 34 13
16 35 18
15 36 17
14 37 1
13 38 4
12 39 1
11 40 3
10 41 18
9 42 GND
8 43 12 28
7 44 5
6 45 8
5 46 GND
4 47 4
3 48 GND
2 49 14
1 50 13
J1/J6/J7 1,3,5,7,...,29,31,33 GND
J6 4 GND
J1/J7 16 NC
J4 9,10 NC
J2/J5 2,4,6,8,10,11,12,15,16,19,20 GND
J2/J5 3.5.7.9 NC
--
tsch??,
Jochen
Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/
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6 comments
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ajp166＠bellatlantic.net -
ian_primus＠yahoo.com -
jhfinedp3k＠compsys.to -
jkunz＠unixag-kl.fh-kl.de -
spedraja＠gmail.com