I beg to bring to the Attention of the Collectors herein (and the Lurkers
also) that another very good URL for used and rare tech books is:
www.abebooks.com
However I specifcally disclaim and inure myself against anyone
exhausting their rent and/or retirement money while using that site.
Cheerz
John
I picked this up a few weeks back.
Apple II clone.
Microcom logo on case. Microcom tags on Eproms.Boots with "Microcom" on screen.
Fine shape, can send photos.
Even got a Microcom "branded" floppy that goes with it. Floppy has paper tag with Microcom written on it and serial no.
All working.
Because of space limitations I have to limit myself to what I collect. I have decided to not collect Apple II clones (just collecting those clones would take up quite a bit of space)
Up for trade/giveaway ASAP. Would like it to go to a good home where it will be appreciated... don't want $.I collect 197x-198x micros 8-16 bits.
Something to add to my collection in exchange would be appreciated. See what I have and my wish list at : http://computer_collector.tripod.com
Looking for early Z80-CP/M systems, early trs80 models, Apple III, Next, Lisa (arent we all), Sinclairs other then 1000s... I have lots more to trade...I dont sell - just trade with other collectors.
email me if interested.
Claude
Canuk Computer Collector
Is it a definite that AMIX would be on tape? I seem to remember seeing it at
a local Commodore/Amiga place, thought it was foppies though.. If anyone
cares, I can go look.. I'm sure it would still be there, as the guy who runs
it actually appreciates history and won't sell anything he has only one
of... But he does make copies hehe
Will J
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Well I also went over to the warehouse here and got 2 Control Data 110
microcomputers with lots of software (8" disk) and manuals. The guy
could not find the drive for them or keyboards. The other guys here got
there first so it was not much left that I needed. Also got a large
number of different manuals, HP probe parts, handheld terminals, a Mac
180c for parts, Omnibook parts, Sega game gear items, 5 Tandon 8" drives
(4 in the box), Mac 6214CD for parts, and other small items. The guy's
prices are very low. He has to clean out a 7000 sq ft warehouse full of
stuff. I will be going back one more time this week before closes it
down and hauls everything to the yards.
John Keys
Sorry, I haven't heard anything about that. But as far as I can guess, they
probably got rid of it a long time ago. My guess is that we now use
something similar to that, only it's all digital now. I can say this because
the Navy likes to be as state of the art as humanly possible.
>David,
>
>Someone once told me about a huge, gymnasium-sized analog battle >simulator
>somewhere in Groton. It apparently used small replicas of >ships that were
>attached to wires or something and moved around the >"ocean". The display
>was a periscope that came up through the floor and >you practiced firing
>away at the ships.
>
>Might you know if this is still in operation?
____________________________________________________________
David Vohs, Digital Archaeologist & Computer Historian.
Home page: http://www.geocities.com/netsurfer_x1/
Computer Collection:
"Triumph": Commodore 64C, 1802, 1541, FSD-1, GeoRAM 512, MPS-801.
"Leela": Macintosh 128 (Plus upgrade), Nova SCSI HDD, Imagewriter II.
"Delorean": TI-99/4A, TI Speech Synthesizer.
"Monolith": Apple Macintosh Portable.
"Spectrum": Tandy Color Computer 3, Disto 512K RAM board.
"Boombox": Sharp PC-7000.
"Butterfly": Tandy Model 200, PDD, CCR-82
____________________________________________________________
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A friend, Milton Blackstone - milton(a)sciti.com - has a major pile of
docs and disks (perhaps 500) for the subject machines. Please contact
him directly if interested.
- don
From: Clint Wolff (VAX collector) <vaxman(a)qwest.net>
>Heh... I was pondering this morn (whilst making lasagne) about building
>a RD52 replacement out of flash memory... I have previously looked at
>emulation with a modern IDE hard drive, but gave it up as infeasible...
If that was too hard, emulating the RD52 itself is worse.
>Each track occupies 2^n bytes from a 128MB (or larger flash rom).
>
>The step-in (step-out) signal increments (decrements) a counter
>that drives the upper address bits.
You also need track 0000 indication so you can home to a
known point.
>After a suitable delay (can anyone say 555 timer) the seek complete
>bit is set, and the bits are transmitted in serial fashion from a
>fixed clock running at 5MHz (i think).
It's serial but there are embedded clock and little bits of data like
address marks, sync marks and data marks. The format looks
a little like Sync HDLC with MFM or FM encoding added.
If your recording it like a wav or image then expect to waste a
few bits per "bit" stored. I'd shoot for 8:1.
then there are things like INDEX and aligning data with it.
>If write gate is asserted, the bits are latched, at written to the
>flash 16 bits at a time, thus giving a write cycle time of 3.2 uS
bytes are sent serial and the default is 8bits.
>which should be fast enough. An improvement would be to cache the
>write data in a small RAM (32Kx8 is smallest I know of), then write
>the whole thing at once during a seek. The tricky part here is
>maintaining synchronization with the controller, probably requiring
>a PLL of some sort...
Yep you need that too plus a lot more. Keep in mind the FDC (9224
on the RQDX3 is not fully compatable with RQDX1 ) runs at it's
internal clock for writing and you keep up or loose data. Also data
is sent at the physical sector level of single or groups of multiple
sector transfers.
>Alternately, the data could be de-MFM-ed, and stored just as data,
>but this requires re-MFM-ing, and adding address/data marks as well.
>It also breaks any diagnostic that wants to write long to force an
>ECC error.
Yep your starting to see how complex it is. Believe it or not running
two FDCs back to back will work but the CPU intelligence needed
on the emulator side will not be trivial.
Really the simplest way out is an IDE or DRAM and a bus interface
of some sort. Sure this means a new driver is needed and that has
it's headaches. However from a hardware perspective the IDE is point
blank
simple with a Ramdisk being harder. What complicates the issue is
when someone wants to run V7 or Rt11 and wants a standard driver to work.
MSCP is common enough but requires a cpu to manage the protocal and
the sticky problem of copyright/patents.
I'd think the effort should start at the nuts and bolts level. IE: what
widely used
PDP-11 software driver do we have the most docs for and can modify
easily.
then build an IDE to match that. FYI: there is one that come to
mind...TU58!
The answer is yes it can be done but if you can't conceive of the
difficulties
you not likely to be able to make it work. For it to be useful for most
everyone
it would have to be simple enough to use (PCB and assembled) and
reliable
(means tested under all OSs and diags) or it would be a very expensive
science fair project.
Allison
On February 2, Jerome Fine wrote:
> course if the Pentium had been around 10 years sooner, maybe DEC
> would have made a better PDP-11.
Oh good lord. That's a troll for flamage if I've ever read one. A
good one though; I almost cut loose on you for it with about ten pages
about why this is full of doodoo. ;)
-Dave McGuire
Does anyone have the technical manual on the CXA16, 16 port async
multiplexor? I've got one that I would like to update the NetBSD driver so
that it can talk to it, VMS talks to it just fine but NetBSD recognizes
that it is there but can't seem to get either its baud rate set or get
interrupts. Also NetBSD only works in DHV mode not DHU mode which would be
preferable.
--Chuck
>Were these three-ring binders, or 8.5"x11" paperbacks? If there the
newer
>paperbacks they'd probably be of use to a lot of people on this list.
I've
>got a V6.1 Wall, it's nice :^)
I have the V5 wall, I dumped the binders for smaller packaging so I
could keep them. Even then it's over four feet of paper!
>> boxed copy of Borland DBASE IV VAX/VMS 1.1 with TK50 & 9-Track media,
and a
>
>Drool!
Oh! and I even use that!
>> workstations, one with just about every SCSI adapter I could identify,
and a
>> bunch of Pathworks misc. stuff, for OS/2, Windoze, Mac...
I have pathworks V4.1 and V5 stuff.
>Hmmm, do they have the Pathworks Mac doc's? I could use those! I use a
>combo of it, a Ethertalk-to-localtalk converter and Samba to turn my VMS
>server into a Printserver for my HP5MP.
Cool.
Allison
