Hi, Phil.
On Dec 5, 19:46, Philip Pemberton wrote:
> Peter Turnbull wrote:
> > I have a spare D780C with a 1983 date code. Mail me off-list if you
> > want it.
> That would be great - how much would postage be?
Not much, it would go in a jiffy bag with sime AS foam.
> I don't suppose you've got any spare 2114 RAMs as well, have you? I think
> the RAMs in my Ace may have died when I slipped with the PSU cable
(oops).
I have a spare pair, maybe more. How many do you need?
But if you've killed it with low-voltage-that's-more-than-five volts,
chances are you've fried some TTL. The NMOS will survive moderate
overvoltage better than the TTL will, so you might have a bit of work on
your hands.
This might cost you a trip to the O2 shop ;-)
--
Pete Peter Turnbull
Network Manager
University of York
to all, anyone interested in a set of three chips for the pdp11 visit this
link...
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2078019983
The chips are the 11/23 CPU ( 57-00000-01A1 ), the KEF11AA floating point
( 57-00001-01A1 ) and the Memory Management Unit ( 21-15542-01 ). These
chips are assumed good and are guaranteed not DOA. Replacements available
for any chip proven to be non-functional.
regards,
thom
At 04:16 PM 12/5/02 +0000, you wrote:
>I know we've been through this before but does anyone
>have a handle on the going rate for scrap PCBs in the
>UK?
Depends on the boards and whats on them. The old 486 I think type chips are
worth something like $35/lb (just chips, not boards), so boards get
complicated with socketed vs soldered, and gold vs plain chips.
I tried a google and HP website search for documentation on the 800/G30
G-Class server and could not find any. Does anyone else know were a PDF is?
I would like to learn more the server I got yesterday and get it up and
running. Thanks in advance for any help.
I know we've been through this before but does anyone
have a handle on the going rate for scrap PCBs in the
UK?
The reason - I've been made aware of a quantity of now
obsolete microprocessor equipment but I'm bidding against
the scrap man. Who knows, he may be charging for the
removal but I'd hate to lose this to him.
Cheers,
Lee.
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Hi,
well, I've seen some discussions back and forth around here about what things
cost "back in the day", with some wildly differing figures at times.
In St. Louis, we used to have a distributor named Ultra-Comp, who
was in the Earth City area in Maryland Heights (by the I-70/I-270
interchange).
So here's an Ultra-Comp price list of 1988 vintage:
http://dbz.icequake.net/share/doc/comphist/ultracomp_prices.pdf
Enjoy!
(BTW, my dad bought the "Ultra Turbo-10 640 system" from them.
Upgraded from a Leading Edge 256K 4.77mhz system, 1986 vintage.
In 1991, I tasted a 386-40 clone for the first time, and was forever
weaned from the 8086. Hehe.)
--
Ryan Underwood, <nemesis at icequake.net>, icq=10317253
I found two SGI "granite" monitors for $5 in a surplus place this morning. Does anyone know if these will work with the SGI Indigo? (XS-24 video card.) I tried them but I'm not getting any video and I'm not sure if these are both bad or if they're even supposed work with the Indigo. I checked the SGI and Indigo FAQs and can't find anything about exactly what systems the monitors are compatible with.
Joe
I just received a collection of 5 1/4" floppies from a retired
computer science teacher.
It consists of about three hundred C-64 software, and about five hundred PC
titles. It also included a copy of Windows 1.04, box, disks and manual.
Cheers
Charlie Fox
Charles E. Fox Video Production
793 Argyle Rd.
Windsor Ontario Canada N8Y 3J8
519-254-4991 foxvideo(a)wincom.net
Check out the "Camcorder Kindergarten"
at http://chasfoxvideo.com
> Does anyone have any documentation on the data structures of
> TRSDOS 1.3? Specifically, I'd like to know the catalog structure,
> as well as the scheme for storing files across multiple sectors.
I used to have that in my head, but it's fuzzed a bit over the years.
When I was working for the LDOS folks in 1981, I wrote a program to read
TRSDOS 1.3 diskettes and copy the files to LDOS diskettes. I don't know
of a place where the TRSDOS 1.3 on-disk structures are written down,
though you could try Wade Fincher's manual scans at
http://www2.asub.arknet.edu/wade/operate.htm and David Keil's at
http://discover-net.net/~dmkeil/trspdf.htm.
The general idea is similar to other TRS-80 operating systems. The
other systems are well documented (especially LDOS; see my web site),
but Model III TRSDOS is different in several ways. Here's a summary of
what I remember.
Tracks are numbered from 0. The disks are single-sided. Sectors are
numbered from 1 to 18. There are 256 bytes/sector. Tracks are divided
into allocation units called granules; there are 3 sectors/granule (6
granules/track).
You should find the directory on track 17 (decimal). All sectors on
tracks *other* than 17 are written with a deleted data address mark
(this is opposite from other TRS-80 operating systems, by the way).
On track 17, sector 1 has a bitmap to show which granules are allocated.
There is one byte per track. There might be a second bitmap to show
which granules are locked out as defective. Towards the end of the
sector is the disk name and date and the AUTO command (executed if you
boot the disk).
Sector 2 has a hash table that was used to help search the directory
without reading all of it. You can ignore it if you're just reading the
disk.
The remaining sectors are full of 48-byte directory entries, with the
last 16 bytes of each sector unused. The fields are similar to what's
described in the LDOS documentation
(http://www.tim-mann.org/trs80/doc/prgguide.pdf), but there are some
differences in pesky details, like a possible off-by-1 error in the
count of the number of sectors in the file. The other main difference
is that the Model III TRSDOS directory entries are 16 bytes longer, so
that you can have more extent pointers in the entry.
Hope this helps.
--
Tim Mann tim(a)tim-mann.org http://www.tim-mann.org/
>I don't suppose you have a copy of the Jupiter Ace schematics, do you?
Isn't there a set of schematics on the web? I was given a Jupiter Ace
pcb a while back and it came with a set of schematics. What I'm not certain
is whether this was a "real" Ace pcb (real in the sense of being a copy of
the original) or whether this was the result of a build-a-lookalike-from-scratch
project. Whichever the PCB is, the schematics match.
Antonio
