29 Apr
2008
29 Apr
'08
8:04 p.m.
I am the 'proud' owner of a VAX 4000/200.
I have not tried to do much with it yet, first I'll indicate it's
config, then my questions
(as I'm 'new' to VAX (I admin'd one for a bit 14 years ago... but I
deferred to several
folk on campus as I was new to admin'ing VMS and I didn't stay in the
role long enough
to really pick much up)).
M9715-AA VAX 4000 internal card (terminates DSSI and SCSI busses)
M7626-AA KA660 CPU
M7622-AT 16M Memory
M7622-BF 8M Memory
M3108-PA DSV11-S 2 Line Sync Comm
SI-SC 1000 System Industries SCSI card
M3118-YA CXA16-M 16 Async Line
M3118-YA CXA16-M 16 Async Line
M3119-YA CXA08-M 8 Async Line
M3118-YA CXA16-M 16 Async Line
M7559-00 TQK70 Tape controller
are the cards present (from slot 0? (rightmost slot))
And it has 3 DSSI drives, 2 5.25" RF31 (381M) and 1 3.5" RF36 (in one of
the 'rail' sets
that will support 2 3.5" drives) (1.6G).
the 2 RF31s are ID 0 and 1
the RF36 is ID 2
It also has a TK70.
Now onto the questions:
1. How is 24M of RAM ? Should I be on the lookout for more ?
2. What releases of VMS, Vax Ultrix, etc should I limit myself to based
on 24M and KA660 ?
3. Was there a DSSI version of TK70 ?
4. 4000/200 does not have SCSI, correct ? (other than someone added an
SI SC-1000)
5. any idea if a SCSI CD can be booted via the SI SC-1000 ? (boot cmds
would be ?)
6. This is supposed to have some version of VMS on it... I have no PW...
pointers to 'break in'
procedure and password reset ? What is the default sysadmin
account as well ?
7. There is what looks like a 50 pin scsi terminator (small size like
Sun 411 case) that I've
identified as DSSI terminator., What is the 50 pin centronics style
connector above that ?
8. What is a DSV11-S good for ?
9. Not that I plan to, but how do you make use of the async cards (they
have 50 pin centronics
style connectors)
10. Anyone got any more of the 2 3.5" drive mounting assemblies ?
11. Anyone got any RF36 or higher density DSSI drives available ?
12. Can the DSSI drive 'bus' be converted to SCSI ?
13. What is the largest drive/partitions supported on 4000/200 (DSSI or
otherwise) ?
14. Have I asked enough questions ? (What have I forgotten to ask :-) ? )
How are the 4000/200 machines ? (Other VAXen I have is VAXStation 2000 and
VAXStation 3100, neither of which is running (driveless))... I find the
enclosure
design pretty cool... and for a large box, has nice design (visually)...
(I know it is no
SGI... and that it is DEC beige.... but I like the design (doors, badge,
etc)).
Any drop in cpu/memory upgrades that are worthwhile (in the free to
cheap territory
of course :-) ).
Thanks in advance for any cool info/pointers/etc...
-- Curt
1 May
1 May
1:37 a.m.
On Tue, 29 Apr 2008 23:04:23 -0400
"Curtis H. Wilbar Jr." <rescue at hawkmountain.net> wrote:
1. How is 24M of RAM ? Should I be on the lookout for
more ?
24 MB is OK, but a few more bits would be better.
2. What releases of VMS, Vax Ultrix, etc should I
limit myself to
based on 24M and KA660 ?
Ultrix doesn't support the MicroVAX 4000 line of
machines. If you want
*ix you have to go to NetBSD or OpenBSD. NetBSD sould run fine on it. I
run NetBSD on my 4k2 a few weeks back to fix a few things.
3. Was there a DSSI version of TK70 ?
I
don't know about the TK70, but the first generation of DLT drives
(successors to the TK70) was availale with DSSI intrface.
4. 4000/200 does not have SCSI, correct ? (other than
someone added
an SI SC-1000)
Yes. No SCSI. It is all DSSI.
5. any idea if a SCSI CD can be booted via the SI
SC-1000 ? (boot
cmds would be ?)
I connected a CDROM to a Dilog MSCP SCSI adapter and it showed up
as a
read only disk. So the usual disk boot commands worked.
7. There is what looks like a 50 pin scsi terminator
(small size like
Sun 411 case) that I've
identified as DSSI terminator., What is the 50 pin centronics
style connector above that ?
Depending on the enclosure (BA440?) it may be SCSI.
The BA440 has some
slots with SCSI on the backplane in addition to DSSI. It was meant to
put a SCSI CDROM in there and interface it to the VAX using a KZQSA.
8. What is a DSV11-S good for ?
DECnet? ;-)
9. Not that I plan to, but how do you make use of the
async cards
(they have 50 pin centronics style connectors)
You need special break out cables.
You can build them yourself if you
know how to handle a soldering iron.
12. Can the DSSI drive 'bus' be converted to
SCSI ?
No. ? Ohh, you mean just the physical bus wiring on the backplane?
Hmmm. Maybe. If all 50 pins are routed straight through it shouldn't
matter if you connect them to a SCSI or DSSI adapter.
How are the 4000/200 machines ? (Other VAXen I have
is VAXStation
2000 and VAXStation 3100, neither of which is running (driveless))...
The 4k2 was
the last QBus CPU. Starting with the 4k3 the CPU had
special backplane connectors.
Any drop in cpu/memory upgrades that are worthwhile
(in the free to
cheap territory of course :-) ).
As I wrote: The later VAXen used an entirely
different backplane.
Special connectors for CPU and RAM, QBus only in the left potion of the
backplane. You would need a new backplane along with new CPU and RAM. Most likely you will
get that backplane only within a complete enclosure.
--
tsch__,
Jochen
Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/
6:21 a.m.
Jochen Kunz wrote:
I thought the 4000-200 was designed to work in the BA123 or something
similar. The BA440 has those processor-memory interconnect slots to the
right of the Qbus, right?
Peace... Sridhar
7. There is
what looks like a 50 pin scsi terminator (small size
like Sun 411 case) that I've identified as DSSI terminator., What
is the 50 pin centronics style connector above that ?
Depending on the enclosure
(BA440?) it may be SCSI. The BA440 has
some slots with SCSI on the backplane in addition to DSSI. It was
meant to put a SCSI CDROM in there and interface it to the VAX using
a KZQSA.
7:55 a.m.
On Thu, 01 May 2008 09:21:50 -0400
Sridhar Ayengar <ploopster at gmail.com> wrote:
I thought the 4000-200 was designed to work in the
BA123 or something
similar.
The 4k2 CPU doesn't fit into a BA123 or BA23 because a connector on
the
front of the CPU card is too high and the slots in the BA123 / BA23 are
to narrow. (Well, maybe it will fit if you mount it into the second
slot. But this leaves only one Q/CD slot for memory in case of the
BA23.) Usual for the 4k2 are the BA213 or BA215 "S-Box" style
enclosures. (BA215 is about half a BA213.) The slot with is larger in
the S-Boxes and there are special QBus cards with "S-Box handles".
But there are a few 4k2 in BA440 boxes. I suppose DEC switched from
BA213 to BA440 style boxes at the end of the 4k2 live time.
The BA440 has those processor-memory interconnect
slots to
the right of the Qbus, right?
Yes. IIRC this special CPU slot also brings one of
the two DSSI buses
to the backplane.
--
tsch__,
Jochen
Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/
8:13 a.m.
Jochen Kunz wrote:
BA213. That's the one I misremembered. I thought the 4200 came only in
the BA213 and didn't fit in the BA440. And I also thought the 4300 came
only in the BA440 and didn't fit in the BA213.
Peace... Sridhar
I thought the
4000-200 was designed to work in the BA123 or something
similar.
The 4k2 CPU doesn't fit into a BA123 or BA23 because a connector on
the
front of the CPU card is too high and the slots in the BA123 / BA23 are
to narrow. (Well, maybe it will fit if you mount it into the second
slot. But this leaves only one Q/CD slot for memory in case of the
BA23.) Usual for the 4k2 are the BA213 or BA215 "S-Box" style
enclosures. (BA215 is about half a BA213.) The slot with is larger in
the S-Boxes and there are special QBus cards with "S-Box handles".
But there are a few 4k2 in BA440 boxes. I suppose DEC switched from
BA213 to BA440 style boxes at the end of the 4k2 live time.
2 May
2 May
12:33 a.m.
On Thu, 01 May 2008 11:13:14 -0400
Sridhar Ayengar <ploopster at gmail.com> wrote:
I thought the 4200 came only in the BA213 and
didn't fit in the
BA440. And I also thought the 4300 came only in the BA440 and didn't
fit in the BA213.
As Glen remarked: I was wrong. I refered to the BA430 (all QBus)
vs.
BA440 (CPU / memory interconnect + QBus). 4k3 and onward need a BA440
due to the special CPU / memory interconnect. There is no way to get
a 4k3 in a BA213. I have seen 4k2 in BA430 boxes, but they are rare.
--
tsch__,
Jochen
Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/
7:37 a.m.
Jochen Kunz wrote:
I'm actually looking for a BA431 box. (And BA441 boxes.) I have one
now, I need a second. (If I could find them cheaply enough, I would
love to find six BA441 boxes.)
Peace... Sridhar
I thought the
4200 came only in the BA213 and didn't fit in the
BA440. And I also thought the 4300 came only in the BA440 and didn't
fit in the BA213.
As Glen remarked: I was wrong. I refered to the BA430 (all QBus)
vs.
BA440 (CPU / memory interconnect + QBus). 4k3 and onward need a BA440
due to the special CPU / memory interconnect. There is no way to get
a 4k3 in a BA213. I have seen 4k2 in BA430 boxes, but they are rare.
9:31 a.m.
On Fri, 02 May 2008 10:37:50 -0400
Sridhar Ayengar <ploopster at gmail.com> wrote:
I'm actually looking for a BA431 box. (And BA441
boxes.) I have one
now, I need a second. (If I could find them cheaply enough, I would
love to find six BA441 boxes.)
???
Clustermania?
Actually I striped a BA400x. This is a BA430 / BA440 style DSSI disk
enclosure. I ripped all the metal, disk frames, etc. out of it leaving
only the outer shell and plastic skins. Then I mounted some shelfes
inside. Makes a nice cabinet and it is now the left "leg" of my desk.
(The right "leg" is a Sun 2/260.)
--
tsch__,
Jochen
Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/
12:41 p.m.
Jochen Kunz wrote:
On Fri, 02 May 2008 10:37:50 -0400
Sridhar Ayengar <ploopster at gmail.com> wrote:
I suppose on some level, yes.
I have two 4700As in skinless BA440s, and four 4505As with no chassis.
I'd love to properly rackmount them.
Peace... Sridhar
I'm actually looking for a BA431 box. (And
BA441 boxes.) I have one
now, I need a second. (If I could find them cheaply enough, I would
love to find six BA441 boxes.)
???
Clustermania?
1:15 p.m.
On Fri, 02 May 2008 15:41:13 -0400
Sridhar Ayengar <ploopster at gmail.com> wrote:
I have two 4700As in skinless BA440s, and four 4505As
with no
chassis. I'd love to properly rackmount them.
Remove the plastic skins from a
BA213 or BA4*0 and you get a 19"
rackable box. I converted a BA213 MicroVAX 3500 to a 3600 that way...
--
tsch__,
Jochen
Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/
1:28 p.m.
Jochen Kunz wrote:
On Fri, 02 May 2008 15:41:13 -0400
Sridhar Ayengar <ploopster at gmail.com> wrote:
Hence "I have two 4700As in skinless BA440s" and "I'd love to properly
rackmount them".
Peace... Sridhar
I have two 4700As in skinless BA440s, and four
4505As with no
chassis. I'd love to properly rackmount them.
Remove the plastic skins from a
BA213 or BA4*0 and you get a 19"
rackable box. I converted a BA213 MicroVAX 3500 to a 3600 that way... 
2:32 p.m.
Sridhar Ayengar wrote:
Hence "I have two 4700As in skinless BA440s"
and "I'd love to properly
rackmount them".
Surely once you've deskinned a BA440, you bolt it to the rack
via the holes in the flanges at the front.
ISTR that when I did that to my two 4000's in the lab
I could get one in the front and one in the back of the rack.
Have I misunderstood or do you think there is some special
rack-mounting hardware available?
Antonio
No virus found in this outgoing message.
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4 May
4 May
12:33 p.m.
Antonio Carlini wrote:
Sridhar Ayengar wrote:
The BA441 chassis is a proper rackmount box for those machines which
sits on slides.
Similarly, a BA431 is a rackmount box with a 12-slot Qbus backplane.
Hence "I have two 4700As in skinless
BA440s" and "I'd love to properly
rackmount them".
Surely once you've deskinned a BA440, you bolt it to the rack
via the holes in the flanges at the front. Have I misunderstood or do you think there is some
special
rack-mounting hardware available?
There is. It's called a "BA441 Chassis".
Peace... Sridhar
12:57 p.m.
New subject: Minimal CP/M SBC design?
Hi, all,
I was staring at an SBC I have here with a 6MHz Z-80, some ROM, some RAM,
and a 26-pin off-board bus for some Z80-PIO boards (this thing was built
as a multi-parallel-printer switcher). I've been musing about what it
would take to boot CP/M up on this.
For user I/O, I was planning on a console serial port and a terminal/terminal
emulator. I have IM6402s on hand, but I'd be interested in hearing if
certain other chips are preferred, based on what BIOS code is floating
around out there. I also have a 16550, but I don't think I have any
Z80-SIO chips handy.
For mass storage, I was planning on either Compact Flash or an SD card.
I think I've seen both as I googled around for modern SBCs. Any of the
media I have lying around is plenty large enough (I even have some 4MB
CFs and a 2.5MB full-sized PCMCIA flash card on hand).
I am a little unclear, though, about how traditional CP/M systems
were set up for ROM and RAM. Was it common to use a "shadow ROM"
in low mem at reset, then have the BIOS live at the top of memory?
How did 64K RAM CP/M machines handle the BIOS? Did they temporarily
ghost the ROM on top of RAM until some bit of code could read ROM
and write RAM then bank out the ROM? Since I think I "need" at
least 48K of RAM, I was planning on a pair of 62256s. I could easily
do 56K of RAM low and 8K of ROM high, I think, unless there's some
other arrangement that's obvious to try for a simple design.
I've never tried writing a BIOS for a CP/M machine, but my understanding
is that things are modular enough that once you know what I/O chips
you have and at what I/O addresses, for a straightforward, non-clever
design, the coding is equally straightforward and non-clever (but please
feel free to enlighten me if otherwise).
Thanks for any tips, especially from anyone on the list who has ever
rolled their own CP/M machine.
-ethan
--
Ethan Dicks, A-333-S Current South Pole Weather at 4-May-2008 at 19:40 Z
South Pole Station
PSC 468 Box 400 Temp -74.2 F (-59.0 C) Windchill -105.4 F (-76.4 C)
APO AP 96598 Wind 7.4 kts Grid 77 Barometer 691.6 mb (10194 ft)
Ethan.Dicks at usap.gov http://penguincentral.com/penguincentral.html
1:08 p.m.
New subject: Minimal CP/M SBC design?
On 5/4/08 3:57 PM, "Ethan Dicks" <ethan.dicks at usap.gov> wrote:
Hi, all,
I was staring at an SBC I have here with a 6MHz Z-80, some ROM, some RAM,
and a 26-pin off-board bus for some Z80-PIO boards (this thing was built
as a multi-parallel-printer switcher). I've been musing about what it
would take to boot CP/M up on this.
{snippage}
-ethan
I know and appreciate the DIY nature of this, having worked on a few 6502
SBC designs even though there were a few out there already, but maybe take a
look at the P112 (http://frotz.homeunix.org/p112/) for some inspiration.
IIRC, it's the size of a 3.5" floppy drive. I actually built one of the
original versions but I never got down to using it much. I might have to
pull it out and play with it now that I know more about bringing up a CP/M
system than when I did back then.
Rich
--
Rich Cini
Collector of Classic Computers
Build Master and lead engineer, Altair32 Emulator
http://www.altair32.com
http://www.classiccmp.org/cini
1:22 p.m.
New subject: Minimal CP/M SBC design?
On Sunday 04 May 2008 15:57, Ethan Dicks wrote:
I am a little unclear, though, about how traditional
CP/M systems
were set up for ROM and RAM. Was it common to use a "shadow ROM"
in low mem at reset, then have the BIOS live at the top of memory?
How did 64K RAM CP/M machines handle the BIOS? Did they temporarily
ghost the ROM on top of RAM until some bit of code could read ROM
and write RAM then bank out the ROM? Since I think I "need" at
least 48K of RAM, I was planning on a pair of 62256s. I could easily
do 56K of RAM low and 8K of ROM high, I think, unless there's some
other arrangement that's obvious to try for a simple design.
I have some amount of docs on that stuff scattered here and there, and am not
real clear at the moment just where it's all located. I do recall some
stuff, though. One that comes to mind had the ROM (or EPROM?) mapped in at
reset, and one of the coldstart initialization routines copied some small
portion of that up into high RAM. I know that the Osborne Executive had
3 "banks" one of which had the eprom and video RAM mapped into it. I think
that some of the TRS-80 machines needed a special version of CP/M because
they had ROM in low memory and no way to map it out. There were probably
other variations I'm not thinking of besides.
I've never tried writing a BIOS for a CP/M
machine, but my understanding
is that things are modular enough that once you know what I/O chips
you have and at what I/O addresses, for a straightforward, non-clever
design, the coding is equally straightforward and non-clever (but please
feel free to enlighten me if otherwise).
That's my understanding of it too, though the mechanics of actually putting
together a bootable CP/M system are something I'm still a bit fuzzy on. I
probably oughta do that with my BBII one of these days.
I have a fair pile of downloaded files pertaining to this and other
CP/M-related stuff, what used to be that portion of the files section on my
old BBS on hand here, I can send you a list of what's there off-list if you
like.
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
7:43 p.m.
New subject: Minimal CP/M SBC design?
At 7:57 PM +0000 5/4/08, Ethan Dicks wrote:
Thanks for any tips, especially from anyone on the list
who has ever
rolled their own CP/M machine.
You might want to talk to Allison, this sounds like her sort of project.
Zane
--
| Zane H. Healy | UNIX Systems Administrator |
| healyzh at aracnet.com (primary) | OpenVMS Enthusiast |
| MONK::HEALYZH (DECnet) | Classic Computer Collector |
+----------------------------------+----------------------------+
| Empire of the Petal Throne and Traveller Role Playing, |
| PDP-10 Emulation and Zane's Computer Museum. |
| http://www.aracnet.com/~healyzh/ |
8:54 p.m.
New subject: Minimal CP/M SBC design?
From: ethan.dicks at usap.gov
I am a little unclear, though, about how
traditional CP/M systems
were set up for ROM and RAM. Was it common to use a "shadow ROM"
in low mem at reset, then have the BIOS live at the top of memory?
Hi
Most ROM based machines do some kind of shadow method to boot,
unless one has a front panel to select the boot address.
Other than that, there is no particular reason to shadow the high
memory ROM.
My CP/M system is completely RAM. The disk is DMA and has
a built in boot strap boot from disk. No ROM at all in my machine.
Dwight
_________________________________________________________________
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5 May
5 May
6:26 a.m.
New subject: Minimal CP/M SBC design?
On Sunday 04 May 2008 23:54, dwight elvey wrote:
How does that bootstrap work, then, with no ROM?
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
From:
ethan.dicks at usap.gov
I am a little unclear, though, about how traditional CP/M systems
were set up for ROM and RAM. Was it common to use a "shadow ROM"
in low mem at reset, then have the BIOS live at the top of memory?
Hi
Most ROM based machines do some kind of shadow method to boot,
unless one has a front panel to select the boot address.
Other than that, there is no particular reason to shadow the high
memory ROM.
My CP/M system is completely RAM. The disk is DMA and has
a built in boot strap boot from disk. No ROM at all in my machine.
Dwight
6:55 a.m.
New subject: Minimal CP/M SBC design?
From: rtellason at verizon.net
On Sunday 04 May 2008 23:54, dwight elvey
wrote:
>> From: ethan.dicks at usap.gov
> >> I am a little unclear, though,
about how traditional CP/M systems
>> were set up for ROM and RAM. Was it common to use a "shadow ROM"
>> in low mem at reset, then have the BIOS live at the top of memory?
> Hi
> Most ROM based machines do some kind of shadow method to boot,
> unless one has a front panel to select the boot address.
> Other than that, there is no particular reason to shadow the high
> memory ROM.
> My CP/M system is completely RAM. The disk is DMA and has
> a built in boot strap boot from disk. No ROM at all in my machine.
> Dwight
How does that bootstrap work, then, with no ROM?
Hi
There is ROM in the DMA controller ( not part of system Memory ).
It runs a state machine that causes the first sector of the disk
to be loaded at address 0 on a reset signal.
I have code on that first sector that loads the image of CP/M into
high memory.
To boot all I do is reset, wait for the disk to stop and then run.
There is no system ROM used, just the state machine that
is the disk DMA controller.
If you curious about this controller see:
http://retrotechnology.net/dri/torode_designs.html
Dwight
_________________________________________________________________
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4 May
4 May
3:22 p.m.
Sridhar Ayengar wrote:
OK, now that I've found a piccie, I see the difference. It seems to
be half the vertical height of a BA440.
But if you deskin a BA440, the holes in the flanges are clearly
there to allow rackmounting - what else could they be for?
It looks like on the BA441 you need to slide out the chassis to
get at the Q-Bus devices and the console connections. The cable
wiring looks to be "fun". Do you _really_ need one of those?
Back-to-back BA440s works (or worked for me) and gives you the
same VUP-density in a rack.
Antonio
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03/05/2008 11:22
Antonio Carlini wrote:
Surely once
you've deskinned a BA440, you bolt it to the rack
via the holes in the flanges at the front.
The BA441 chassis is a proper rackmount box for those machines which
sits on slides. 
4:26 p.m.
On Sunday 04 May 2008, Antonio Carlini wrote:
But if you deskin a BA440, the holes in the flanges
are clearly
there to allow rackmounting - what else could they be for?
It looks like on the BA441 you need to slide out the chassis to
get at the Q-Bus devices and the console connections. The cable
wiring looks to be "fun". Do you _really_ need one of those?
Back-to-back BA440s works (or worked for me) and gives you the
same VUP-density in a rack.
The BA4[34]0/BA213 out of the skins is intended to be mounted in a
short-depth or telcom rack (eg, a DECserver 500 or CMR53). The
BA441/431 version is designed to be mounted in a deep (normal) rack.
Also, mounting BA213-style chassis back-to-back screws up the normal
front-to-back cooling that you want in a rack.
Also, I haven't measured mine, but I'm pretty sure that the deep rack
versions (6U maybe?) are less than half the height of the "vertical"
versions. They're pretty much a BA213 set on its back, and with the
drives coming out of where the top of the BA213 chassis used to be.
Pat
--
Purdue University Research Computing --- http://www.rcac.purdue.edu/
The Computer Refuge --- http://computer-refuge.org
1 May
1 May
8:36 a.m.
On Thu, May 1, 2008 at 7:55 AM, Jochen Kunz <jkunz at unixag-kl.fh-kl.de> wrote:
But there are a few 4k2 in BA440 boxes. I suppose DEC
switched from
BA213 to BA440 style boxes at the end of the 4k2 live time.
That's actually a BA430 for the 4000-200 (seach for the
EK?436AB?IN?002 manual on the net), while the BA440 is used for
4000-300 and beyond.
You can put a KA660 in a BA213, but then you need to cable up the DSSI
bus, while the DSSI bus is routed directly to the CPU slot for the
KA660 in the BA430.
The BA440 has those processor-memory interconnect
slots to
the right of the Qbus, right?
Yes. IIRC this special CPU slot also brings one of
the two DSSI buses
to the backplane.
12:33 p.m.
Glen Slick wrote:
On Thu, May 1, 2008 at 7:55 AM, Jochen Kunz <jkunz
at unixag-kl.fh-kl.de> wrote:
I have a pair of BA430s. They contain DECsystem 5500s.
Peace... Sridhar
But there are a few 4k2 in BA440 boxes. I suppose
DEC switched from
BA213 to BA440 style boxes at the end of the 4k2 live time.
That's actually a BA430 for the 4000-200 (seach for the
EK?436AB?IN?002 manual on the net), while the BA440 is used for
4000-300 and beyond. The BA440 has those processor-memory interconnect
slots to
the right of the Qbus, right?
Yes. IIRC this special CPU slot also brings one of
the two DSSI buses
to the backplane.
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