2 Jan
2002
2 Jan
'02
7:38 a.m.
Hey, all.
I've been offered a trade of a MV-III CPU, 8M memory board to match,
and a graphics board for the naked BA123 in the garage. I have some
spare RD53 disks, and a couple of TK50 drives. The gentleman is asking
how many disks the CPU boards are worth, and I haven't a clue.
Any opinions?
Doc
2 Jan
2 Jan
8:05 a.m.
I've been offered a trade of a MV-III CPU, 8M
memory board to match,
and a graphics board for the naked BA123 in the garage. I have some
spare RD53 disks, and a couple of TK50 drives. The gentleman is asking
how many disks the CPU boards are worth, and I haven't a clue.
Any opinions?
Doc
I've an opinion, but it's probably not what you want to hear. No amount of
RD53's is worth a KA650 CPU! I'd personally value a MicroVAX I CPU higher
than RD53 drives. Now an RQDX1 or RQDX2 for a RD53 might be more like i.
BTW, yes, I hate RD53's and consider them worthless!
Zane
8:35 a.m.
On Wed, 2 Jan 2002, Zane H. Healy wrote:
Actually a _working_ RD53 ought to be worth quite a bit since they are
so rare ;-)
Peter Wallace
I've been
offered a trade of a MV-III CPU, 8M memory board to match,
and a graphics board for the naked BA123 in the garage. I have some
spare RD53 disks, and a couple of TK50 drives. The gentleman is asking
how many disks the CPU boards are worth, and I haven't a clue.
Any opinions?
Doc
I've an opinion, but it's probably not what you want to hear. No amount of
RD53's is worth a KA650 CPU! I'd personally value a MicroVAX I CPU higher
than RD53 drives. Now an RQDX1 or RQDX2 for a RD53 might be more like i.
BTW, yes, I hate RD53's and consider them worthless!
Zane
10:45 a.m.
Actually a _working_ RD53 ought to be worth quite a
bit since they are
so rare ;-)
Peter Wallace
True, but unless you *MUST* use them, and there are reasons why some people
must use them, do you really want to trust *YOUR* data to one? I'm sure not
about to trust my data to one. Shoot, my free time is to valuable to use one
in a system where I'm just playing around with the OS!
Zane
11:16 a.m.
On Wed, 2 Jan 2002, Zane H. Healy wrote:
It was a joke...
I recently went through a box of about 6 RD53s, trying to find one to fix
one gone bad in a Xerox Daybreak, a few worked for a while and then went
bad as they all seem to. I ended up tossing all of them, and using Seagate
ST4096 instead -- still running (crosses fingers..)
Peter Wallace
Actually a
_working_ RD53 ought to be worth quite a bit since they are
so rare ;-)
Peter Wallace
True, but unless you *MUST* use them, and there are reasons why some people
must use them, do you really want to trust *YOUR* data to one? I'm sure not
about to trust my data to one. Shoot, my free time is to valuable to use one
in a system where I'm just playing around with the OS!
Zane
1:43 p.m.
On Wed, 2 Jan 2002, Zane H. Healy wrote:
It was a joke...
I recently went through a box of about 6 RD53s, trying to find one to fix
one gone bad in a Xerox Daybreak, a few worked for a while and then went
bad as they all seem to. I ended up tossing all of them, and using Seagate
ST4096 instead -- still running (crosses fingers..)
Peter Wallace
Actually it isn't a joke. They actually are quite valuable.
Zane
Actually
a _working_ RD53 ought to be worth quite a bit since they are
so rare ;-)
Peter Wallace
True, but unless you *MUST* use them, and there are reasons why some people
must use them, do you really want to trust *YOUR* data to one? I'm sure not
about to trust my data to one. Shoot, my free time is to valuable to use one
in a system where I'm just playing around with the OS!
Zane
2 p.m.
I recently went through a box of about 6 RD53s, trying
to find one
to fix one gone bad in a Xerox Daybreak, a few worked for a while
and then went bad as they all seem to. I ended up tossing all of
them, and using Seagate ST4096 instead
q1: is the ST4096 Hd/Cy/Sct compatible with the RD53?
q2: Do the RD52's, RD54's have this flaw too?
(I have 4 RDxx'es, no 53's)
Are these suckers all Quantums?
q3: What's the biggest flaw with these, non-autopark damage?
John A.
3:19 p.m.
On Wed, 2 Jan 2002, John Allain wrote:
Has one more head than RD53 (Micropolis 1325) whether its compatible other
than that (ignoring that last head) I dont know. Just happens to be one of
the MFM drives the Daybreak supports
I recently
went through a box of about 6 RD53s, trying to find one
to fix one gone bad in a Xerox Daybreak, a few worked for a while
and then went bad as they all seem to. I ended up tossing all of
them, and using Seagate ST4096 instead
q1: is the ST4096 Hd/Cy/Sct compatible with the RD53? q2: Do the RD52's, RD54's have this flaw too?
Dont think so, RD54's are Maxtor, Ive had much better luck with them. Dont
think Ive ever had a RD52
(I have 4 RDxx'es, no 53's)
Are these suckers all Quantums?
q3: What's the biggest flaw with these, non-autopark damage?
According to some information I googled for
(www-2.cs.cmu.edu/People/jmcm/info/rd53fix3.txt), the problem with
RD53 -- Micropolis 1325 is that the head stop bumper (probably urethane
rubber) gets sticky so the head servo can't move the head from the rest
position once the drive gets up to speed. This causes the observed
symptoms: the drive spins up and then shuts down. Supposedly this can be
fixed by opening the drive and placing a piece of paper on the sticky
rubber stop. Ive actually tried this but had no success. One drive (with
the same symptoms) I managed to salvage (because the information was
important) by swapping the circuit card, so there may be more than one
failure mode...
John A.
Peter Wallace
8:37 a.m.
On Wed, 2 Jan 2002, Zane H. Healy wrote:
I've an opinion, but it's probably not what
you want to hear. No amount of
RD53's is worth a KA650 CPU! I'd personally value a MicroVAX I CPU higher
than RD53 drives. Now an RQDX1 or RQDX2 for a RD53 might be more like i.
Well, that's sort of my [untutored] view too, but hey. I guess it's
what you want & when. He's doing strictly PDP stuff, so the VAX boards
are gathering dust.
I also forgot to ask the other pertinent question. Assuming I can
replace the DEQNA ethernet adapter, do I *need* local disks? I'm
thinking a TK50, and a remote filesystem. MFM drives have never tripped
my trigger.
Doc
9:10 a.m.
Yes, you will need a local disk or more memory. 8MB isn't enough
to run without swapping, and swapping across the ethernet is
painful. Even running with only a local swap drive is pretty
painful....
I'd suggest you buy a SCSI controller (they typically go for
$150+ on ebay), and hang a 1.2GB SCSI drive off it. You get the
performance and reliability of modern drives to go with a
reasonably fast CPU :)
Clint
On Wed, 2 Jan 2002, Doc wrote:
On Wed, 2 Jan 2002, Zane H. Healy wrote:
I've an opinion, but it's probably not
what you want to hear. No amount of
RD53's is worth a KA650 CPU! I'd personally value a MicroVAX I CPU higher
than RD53 drives. Now an RQDX1 or RQDX2 for a RD53 might be more like i.
Well, that's sort of my [untutored] view too, but hey. I guess it's
what you want & when. He's doing strictly PDP stuff, so the VAX boards
are gathering dust.
I also forgot to ask the other pertinent question. Assuming I can
replace the DEQNA ethernet adapter, do I *need* local disks? I'm
thinking a TK50, and a remote filesystem. MFM drives have never tripped
my trigger.
Doc
10:47 a.m.
Well, that's sort of my [untutored] view too, but
hey. I guess it's
what you want & when. He's doing strictly PDP stuff, so the VAX boards
are gathering dust.
I also forgot to ask the other pertinent question. Assuming I can
replace the DEQNA ethernet adapter, do I *need* local disks? I'm
thinking a TK50, and a remote filesystem. MFM drives have never tripped
my trigger.
Doc
Have you got a VAX with SCSI disks such as a VAXstation 3100 or 4000? I
seem to recall you do. If so you can simply boot off of it's system disk.
If not, try and get an ESDI or SCSI controller (warning, Q-Bus SCSI
controllers are expensive).
Zane
11:05 a.m.
Have you got a VAX with SCSI disks such as a VAXstation
3100 or 4000? I
seem to recall you do. If so you can simply boot off of it's system disk.
If not, try and get an ESDI or SCSI controller (warning, Q-Bus SCSI
controllers are expensive).
I've got a Dilog ESDI system in my MVII. It originally had
two 380MB Maxtor FH drives installed but I pulled one out to keep
around as a backup. It seems to be a pretty nice setup. I wouldn't
mind finding an ethernet board for it though.
Jeff
--
Home of the TRS-80 Model 2000 FAQ File
http://www.cchaven.com
http://www.geocities.com/siliconvalley/lakes/6757
9:06 a.m.
A KA650 + memory is worth about $50 bucks on ebay... A graphics board
(M7168?) is worth between $1 and $10, and the graphics memory boards
(M7169?) are about the same.
A BA123 is worth next to nothing because of the expense involved in
shipping it. Used RD53s are worth about $5, new ones between $20
and $100 depending on how bad the buyer needs one... A dead RD53 is
worth abouth 10 cents a pound. A TK50 is worth $10.
So, If I was making the trade from your perspective, give him the
BA123 and all the RD53s he can haul away, and be happy. Maybe a
TK50 also, but only if he begs...
If I was making the trade from his perspective, I'd hope someone
would stop me from doing something so foolish... To each his own...
Clint
PS These prices are based on what I would pay given the opportunity.
Your mileage may vary...
On Wed, 2 Jan 2002, Doc Shipley wrote:
Hey, all.
I've been offered a trade of a MV-III CPU, 8M memory board to match,
and a graphics board for the naked BA123 in the garage. I have some
spare RD53 disks, and a couple of TK50 drives. The gentleman is asking
how many disks the CPU boards are worth, and I haven't a clue.
Any opinions?
Doc
8390
days inactive
8390
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12 comments
6 participants
participants (6)
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allain＠panix.com -
doc＠mdrconsult.com -
healyzh＠aracnet.com -
jhellige＠earthlink.net -
pcw＠mesanet.com -
vaxman＠earthlink.net