19 Sep
2010
19 Sep
'10
5:25 a.m.
I recently acquired a couple of MicroVAX 2000s. One of them has this board
in it:
http://cid-fc758a5a91b91301.office.live.com/self.aspx/Public/MV2000Board-1.j
pg
I don't know what this board is but it connects by two ribbon cables to
connectors on the main board. Can anyone tell me what it is?
Also one of the machines has faulty memory. I have removed the memory option
and I am trying to identify it, but the marking says "2/4 MB MEMORY OPTION".
Anyone know how to tell which one it is?
Thanks
Rob
19 Sep
19 Sep
6:51 a.m.
Rob Jarratt wrote:
Also one of the machines has faulty memory. I have
removed the memory option
and I am trying to identify it, but the marking says "2/4 MB MEMORY OPTION".
Anyone know how to tell which one it is?
Add up the sizes of the memory chips on the board.
Peace... Sridhar
7:11 a.m.
On Sun, Sep 19, 2010 at 6:51 AM, Sridhar Ayengar <ploopster at gmail.com>wrote:
Rob Jarratt wrote:
that 48pin Dip , AMD AM7990 is an Ethernet controller
=Dan
--http://www.vintagecomputer.net/ragooman/
Also one of the machines has faulty memory. I
have removed the memory
option
and I am trying to identify it, but the marking says "2/4 MB MEMORY
OPTION".
Anyone know how to tell which one it is?
Add up the sizes of the memory chips on the board.
Peace... Sridhar
3:08 p.m.
Dan Roganti wrote:
that 48pin Dip , AMD AM7990 is an Ethernet controller
The OP was talking about two different boards, an unknown board, which
is the ethernet controller, as well as a memory board, which is what I
was talking about.
Peace... Sridhar
Also one of the machines has faulty memory. I have
removed the memory
option
and I am trying to identify it, but the marking says "2/4 MB MEMORY
OPTION".
Anyone know how to tell which one it is?
Add up the sizes of the memory chips on the board. 
7:08 a.m.
Rob Jarratt wrote:
I recently acquired a couple of MicroVAX 2000s. One of
them has this
board
in it [...] I don't know what this board is but it
connects by two
ribbon cables to
connectors on the main board. Can anyone tell me what
it is?
Since it has the AMD Am7990 (DEC 21-21672-07) "LANCE" Ethernet MAC and
what appears to be an AMD Am7992 Ethernet transceiver (obscured by
rework), it seems likely that it is the optional DESVA Ethernet
interface module (installed as standard on VAXstation 2000). Note that
the presence of an Ethernet connector on the KA410 main logic board
doesn't mean that the machine has Ethernet; they just put the connector
there but the necessary electronics is all on the separate module.
Eric
8:12 a.m.
On 09/19/2010 07:08 AM, Eric Smith wrote:
Rob Jarratt wrote:
It is the Ethernet board and yes the electronics were off the main
board. It was not an option
as MicroVAX2000s were all built with it. It was for repair purposes.
The only variation common
was memory. mostly because memory at the start of production was expensive.
Allison
I recently acquired a couple of MicroVAX 2000s.
One of them has this
board
in it [...] I don't know what this board is
but it connects by two
ribbon cables to
connectors on the main board. Can anyone tell me
what it is?
Since it has the AMD Am7990 (DEC 21-21672-07) "LANCE" Ethernet MAC and
what appears to be an AMD Am7992 Ethernet transceiver (obscured by
rework), it seems likely that it is the optional DESVA Ethernet
interface module (installed as standard on VAXstation 2000). Note
that the presence of an Ethernet connector on the KA410 main logic
board doesn't mean that the machine has Ethernet; they just put the
connector there but the necessary electronics is all on the separate
module.
Eric
9:05 a.m.
It is the Ethernet board and yes the electronics were
off the main board.
It
was not an option as MicroVAX2000s were all built with
it. It was for
repair
purposes.
The only variation common
was memory. mostly because memory at the start of production was
expensive.
Allison
So I have one with a DESVA and one without, I think they were both used for
spares at some point , so perhaps one of the machines had to give up its
DESVA as a replacement.
Thanks to everyone for the information.
Now I also know that I have a faulty 4MB memory option too. Unfortunately I
don't really have the expertise or the equipment to diagnose and fix it.
Regards
Rob
3:54 p.m.
On 09/19/2010 02:52 PM, Eric Smith wrote:
allison wrote:
I know but the number built says most people were smart enough to know it
was much less usefull without networking.
These days if you find one without it's because it was robbed and the
chassis
was used for a disk formatter (diags do that well!).
Allison
It is the Ethernet board and yes the electronics
were off the main
board. It was not an option
as MicroVAX2000s were all built with it.
Could be, though some of the manuals say that it was optional on the
MicroVAX 2000 and standard on the VAXstation 2000.
Eric
5054
days inactive
5054
days old
8 comments
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participants (5)
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ajp166＠verizon.net -
eric＠brouhaha.com -
ploopster＠gmail.com -
ragooman＠gmail.com -
robert.jarratt＠ntlworld.com