I am getting my PDP-11/34 and my RK05 disk drives and packs tommorrow, and I have a few questions.They have have been in storage for years, and, although they have been kept dry, they are probably dusty. Can anyone tell me how to clean the drives and the disk packs before I use them?
> From: Ward D. Griffiths III <gram(a)cnct.com>
> To: Discussion re-collecting of classic computers
> Subject: Re: Museums
> Date: Thursday, March 25, 1999 1:14
> (The FCC stepped in because of complaints
> from the close neighbors of folks running TRS-80 Model Ones (or Apple IIs
> or Commodore Pets or S-100 boxen) on the other side of an unshielded wall
> from a television with rabbit ear antenna in apartment buildings).
Our Spectrum Management Agency (or whatever it's called this week) has a
less enduser friendly attitude towards dipsticks in fringe areas that think
they should be able to watch marginal signals on "rabbit ears" inside a
It amounts to "Get an outdoor antenna." No outdoor antenna, no valid
grounds for complaint. There are no specific regs regarding emf emission
>from computers, they have put the onus on the RECEIVER manufacturer to
ensure adequate filtering & shielding from unwanted signals. The CB fad of
the 70's was a direct cause of this, after it was discovered that perfectly
functional CB's would drive certain televisions berserk because of stupid
choices of IF frequencies (Amongst other "They did WHAT!" type design, um,
If you have a properly installed external antenna (Yagi of some kind - cut
for the channels you are trying to receive) and proper coax feed into the
set, and you are STILL getting interference, only then will they look into
This attitude has cured enormous numbers of problems.
Computer Systems Manager
Saint Marks College
Port Pirie, South Australia
>Now the first quesiton is this. I've got a bunch of RL01's and RL02's with
>software on them, and when I got them I backed them up onto my Linux box so
>I could play with them in the Emulator without having RL01/02 drives in the
>house. Using the network I should be able to transfer those Disk Images
>over to the PDP-11. However, can I mount those disk images under RSX-11M
>4.2 like I can RT-11 disk images under RT-11? If so what do I need to do
If you wanted access to the RT-11 files on the RL02, you'd use FLX. Type
HELP FLX at the MCR prompt.
I suspect that you want to access the "raw" image, though. If you were
using 11M+, you'd do a MOU /FOR, then you'd be able to block-address
the drive as the file "DL0:", etc. Under 11M you don't even have to do
the /FOR (though you may have to do an ALLocate.)
>Second question. As I understand it, using DECnet it is possible to use
>the tape drive on VAX from another VAX.
Depending on the version and the tape interface and what software you have,
yes it can be accessed over the network. The best way to do this is to
have the machine with the drive do TMSCP serving to the rest of the cluster,
though there do exist DECUS freeware tools for non-cluster serving across
> Well, the VAX in the house doesn't
>have a tapedrive, and I've not run the network out to the garage. So is it
>possible to have the VAX access the TK-50 on the PDP-11/73 via DECnet?
FAL on RSX won't let you do so. But you could upgrade to 11M+ 4.5, and
use VCP to make a tape image. But even this isn't very smooth.
My favorite solution would be sneakernet - pull the drive and controller
and move it !
Tim Shoppa Email: shoppa(a)trailing-edge.com
Trailing Edge Technology WWW: http://www.trailing-edge.com/
7328 Bradley Blvd Voice: 301-767-5917
Bethesda, MD, USA 20817 Fax: 301-767-5927
I've been looking in my old Tek catalogues and the disk drives for the 4050
series are model number 4907, not 4097. This is from my 84 catalogue. Option
31 is three disk drives, option 30 is two disk drives and option 40 is 4052
and 4054 compatibility.
> No not yet. I'm going to try and get the parts and make a terminal
You have to be REAL careful which way the pins go on that. I had to
make two of 'em because the FAQ (where I found the pin assignments)
wasn't really clear which way you should be looking at it. (They ended up
>>If the root password is changed, your going to be screwed without system
> I'm afraid you're right. That's the nature of Unix.
I was lucky on mine. All of them came from the factory with a preset password
which was *something* like "MPC" or something like that. Anyway, it should be
in the 3B2 FAQ.
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were executed. We had 32K of 2114 1Kx4 SRAMs. Our board performed oddly,
<but it still worked. AFAIK, all MC68000 chips work to spec.
There were many mask revisions early on to correct microcode bugs.
Apparently the microcode was either difficult or very complex contributing
to many errors.
<Anyone want to buy a vintage 1982, gold and ceramic Motorola MC68000? Mak
<offer. Not available in stores. Not found on eBay.
I have two. ;)
<Slower clock speeds. This means that you literally can have a plug in
<upgrade. You could also make one with a larger micron process and more
<vertical and not worry about heating, but that gets to be bone headed. A
<better idea would be to learn from competitors, and start making a more
<economical way of producing chips.
Your way off. First off intel is the process leader. But when you require
everything to be 16bits wide like memory, address latches, byte/word logic
and other nifty things to get to 16bit wide the cost goes up for the system.
the cost to produce the 8088 and the 8086 was nearly the same save for the
8088 was cheaper due to volumes and not technology.
<But I see your point... but remember, before being used on the IBM PC the
<8088 had been on the market for 3 years, and probably in OEM's hands a yea
very true. I was running a 8086/8mhz Multibus based system with 512k of
ram and a 5mb hard disk and 1mb 8" floppies when the IBM PC was introduced.
Needless to say I was appalled at it's terminally poor performance.
<Lower clock speeds... kind of a all-solving solution.
<The 486 was just plain dumb. You didn't really need a 486SX at all. You
<could keep on making a 386, but Intel was afraid of AMD catching up to the
<(with their 40MHz 386's and all). You could have also made a 386 to go in
<a 486 socket.
nope. The 486 executed instruction in fewer cycles and had several
features that made it faster internally for the same clock speed as a 386.
<>The Pentium II?
<The Celeron was actually a pretty good idea, too good. They should have
<made the 128K cache at half clock speed like in the PII. A Celeron 333
<will perform better than a PII 300 in the same system, and you can
<overclock the Celeron to compete with almost all Intel processors.
the celeron is a pentium! it's more integrated with the onboard cache
but it's also a fixed configuration so expanding it is harder.
<Well, they did have a lot of proffessionals a lot smarter than I am workin
<on the problem, and I'm willing to bet they had good ideas, but may have
<been shot down somewhere between 'cost' and 'competion'.
Also they were trying to get the x86 into the other non PC markets.
<I'll say that I don't really like it, and that we could have done much
<better. MIPS, SPARC, Alpha, all better than x86, and if they had
<competition like the x86 market does, then it'd be a good assumption to
<guess that the cost might even be halfed and performance considerably faste
The dynamics of the microprocessor market is more complex than you think.
If MIPS was so good it would ahve pushed out x86. Alpha is a 64bit cpu
targetted at high end systems and the MicroVAX (32bit) was already well
established and faster than 386/486.
<Well, I'm glad that Merced means the end to this lousy architecture. It
<wasn't until this year that we began seriouly getting rid of ISA, which,
<aside from going from 8 to 16 bit, hasn't changed all that much since the
<days of the XT. Note this is good for the collector side of me, but very
<bad for the 'innovative, creative, etc.' side of me.
Yep! Now all your boards don't work in the new machine and most of the
older PCI ones don't behave either.
What will merced run... pentium emulator so there is software for it.