So happens while moving some boards I found a Teltek FDC-1
S100 card.
It's apparently an Z80cpu + FDC(765) + PIO + SIO with some rom
and ram. I think it's a precursor to the S100 system on a
board save for this is doesn't do the ram.
Looking for schematic or manual. Mine may be missing a few chips.
Allison
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> From Jules Richardson, 25. April 2005 16:25
>
> One thing that'd be useful would be a patched version of dd that could
> also retry reading bad blocks n times up to some command-line supplied
> maximum; quite often I find for marginal data (such as flakey floppies
> and hard disks) an initial read might work but one or more subsequent
> reads work find. Far as I know standard dd won't retry reading data at
> all.
I think sdd does all this.
See ftp://ftp.berlios.de/pub/sdd
regards,
chris
Hello.
>Supposedly this is coming from the Department of
>Homeland Security and has something to do with 9/11. (Have you noticed that
>every new, rediculous requirement is in response to 9/11?)
One of my hobbies is the history, and the world politics tracking and analisis.
There are some patterns repeated from time to time in all the world. This
is one of it. The drama itself stays there, and everybody remembers the victims
periodically; but the shock is used like a way where the water can flood.
And what is the reason to justify the use of this way ?
The Security, of course :-) And, please, don't try to say nothing about it
or you will be arrested.
The Security reason, joined with the thinking of the majority of the people
about "I don't wnat problems" works very well. And this gives to the industry
something that goes directly to the recycle plant of HP that someone did
mention in other message. Sincerely, is the better excuse that I see in my
life. And is almost sure that it will work.
The good part (for someone), I suppose, is about the progressive growing
of the cotization of the old computer equipment "of collection".
The economy is incredible.
Cheers
Sergio
>
>Subject: Re: my Data General Nova 4/X, disk woes continue
> From: John Lawson <jpl15 at panix.com>
> Date: Sun, 24 Apr 2005 20:19:22 -0400 (EDT)
> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
> Cc: "General Discussion: On-Topic Posts Only" <cctech at classiccmp.org>
>
>
>
>On Sun, 24 Apr 2005, Tom Jennings wrote:
>
>>
>> After warm-up, it's worse. Signals all through the path look
>> OK, hot and cold. I can see no difference, but this is 10 MHz
>> NRZ data, in a two-state amp with AGC. I think I'm screwed.
>>
>
>
> Um, scrub the heads real good again? Murphy may have been a lot of
>things, but subtle wasn't one of them....
>
>
>Cheers
>
>John
I'd forgotten that little bugger. It thats the case use a different
pack for testing afterwards. sometimes the curd on the head damages
the pack.
Allison
I was going through all my manuals tonight and found a
beautiful condition Hardware Reference Manual for a
CDC Cyber 170 dated 1979. I collect DEC so I have no
use for it.
Not sure how desirable it is but I'll trade for some
VAX 6000 stuff. Boards, manuals, software, etc.
Or if not, I can send it out to anyone who really
needs it for their collection.
Thanks,
Brian.
>
>Subject: Re: small valves and RE: OT
> From: ard at p850ug1.demon.co.uk (Tony Duell)
> Date: Sun, 24 Apr 2005 22:02:54 +0100 (BST)
> To: cctalk at classiccmp.org
>1R5 = DK91 == Pentagrid changer
>1U5 = DAF92 == Detector and 1st audio
>1T4 = DF91 == IF amplifier
>3V5 isn't in the equivalents book, but 3V4 = DL94 == audio output
>
>And of course the 117Z4 is a rectifier with a 117V filament.
I have the RCA small tube handbook. I started as a bag carrying
radio tech in the 70s and still fix stuff. I started with tubes
and recently built some tube radios for fun. I have a pair of
4CX250s itching for a 1kw input amp for 6M. I haven't succumed
yet as I like to do radio stuff at QRP levels for the challenge.
>I am sure I don't need to warn you about this, but it's almost certainly
>a live chassis set when run off the mains.
I bought and keep a isolation transformer for just such repairs when
needed back in 1969. However that radio has a phenolic case thats
in good shape and is therefor insulated.
>
>> If it breaks I will. Believe it or not I use it to listen to local station
>> for ball games.
>
>No why on eart hwould oyu want to do that???
The local station for RED SOX baseball is WEEI 850khz! It's the best
AM radio I have. I have spares for the tubes.
>Oddly we can get Nuts and Volts and more usefully Circuit Cellar in shops
>in the UK... IMHO Circuit Cellar has really gone down over the last year
>or so, it seems to be just yet-another-microcontroller-circuit now, and
>quite often the microcontroller picked doesn't seem to be the most
>appropriate device .Oh well...
On rare occasions I see Elector, nice mag. I tend to delve into fairly
serious stuff like DSP and UHF radio so the ARRL pub QEX is a favorite
alone with Trade rags like Electronics Design. Around here there's about
30 linear feet of shelf allocated to linear and RF as well. So I have
oddities like Electronics Engineers casebook (ca1960) that has ED article
compilations about things like MIT/Lincoln TX2 and non computer stuff
as well.
Allison
I've been using a Textronix Color terminal for several years but never
been able to find a manual for it. Last week I found brand new sealed
manuals for it. "4205/4207 Color Display Terminals" Operators manual and
Opertors Supplement "VT200, 3179G and Tek Enhancements for 4200 Series
Computer Display Terminals". Does anyone want to scan them and post them
anywhere? The only catch is that >> I DO WANT THEM BACK <<<. And I need
them back in a reasonable amount of time.
Joe
I've been working on my car project
(http://wps.com/AMC/1970-AMC-Hornet/index.html) because car season
is coming up soon enough, but I peeled time out for the Nova here
and there.
I originally repaired a popped +5V logic bypass cap on the
Read/Write Board, (some monolithic ceramic job), and changed all
the funky old caps for new ceramic disks. That worked for 20 - 40
hours of operation without a single error. Disk had formatted with
zero media defects. Then the disk started throwing read errors
that moved around (bad blocks later good; more and more bad
blocks...). Diagnostics never indicated any error other than read
errors; seek, format, diags all run 100% perfect except read
errors.
I suspect the Read/Write Board. So I ordered modern monolithic
replacements for the remaining old mono chips from Digikey, and
shotgunned all the old electrolytics etc for good measure, in two
places electrolytics replaced with tantalums (didn't have
.82uF's).
Install board with all new chips and alcohol wash, format -- hard
100% read failure! D'OH! Long story short, I found internal +6V
was not; turns out I installed a tant backwards. doh. New tant,
+6V fine.
Formats, reads OK, then errors again! Sheesh! System has been on
for two hours (I'm getting paranoid, so temp stabilize the whole
thing); halted diags, loaded disk heads, installed drive cover,
pushed into the rack, left for an hour for the drive temp to
stabilize (this is a religious rite, might as well kill a chicken)
then format and test again.
After warm-up, it's worse. Signals all through the path look
OK, hot and cold. I can see no difference, but this is 10 MHz
NRZ data, in a two-state amp with AGC. I think I'm screwed.
The R/W board is a piece of work too. I suspect it's an early
revision, as the board is a hack job, covered in cut traces,
components and jumpers on the bottom, and there's a !#$%!! trimpot
crammed in somewhere as well as kludgey RC (lopass) networks in
some digital logic. Plus, the PC board was milled out for access
to a middle layer. Not Good. Plus, it doesn't match the schematic
(though it's close enough to poke around in with a scope).
Photos of the nasty board here,
http://wps.com/NOVA4/pitchas.html
About halfway down.
Anyone got a spare board?!
Hi Sellam
I wrote some code to talk to a standard disk controller
that runs on a AT. I wrote it because I needed to get
the MFM information from disk that had the first track
set to FM while the others were MFM. I tried 22disk
without success being that my controller doesn't do
FM. In my case, the first sector being FM wasn't an issues
since I could format on my M20 but I needed to read the
other tracks.
The code is written in Forth ( sorry about that ). If
you'd like to look at it, I can dig it out. It does
the standard DMA transfers on an AT. I don't recall
but I suspect it has little error checking.
Dwight
>From: "Vintage Computer Festival" <vcf at siconic.com>
>
>On 25 Apr 2005, Christian Groessler wrote:
>
>> > From Jules Richardson, 25. April 2005 16:25
>> >
>> > One thing that'd be useful would be a patched version of dd that could
>> > also retry reading bad blocks n times up to some command-line supplied
>> > maximum; quite often I find for marginal data (such as flakey floppies
>> > and hard disks) an initial read might work but one or more subsequent
>> > reads work find. Far as I know standard dd won't retry reading data at
>> > all.
>>
>> I think sdd does all this.
>> See ftp://ftp.berlios.de/pub/sdd
>
>Thanks for all the feedback, everyone!
>
>I checked out sdd and it does not mention anything about errors.
>Nonetheless, I'll take everyone's input and get a Linux system running
>(something I've been meaning to do anyway). If need be, I'll hack dd to
>make it work in a sane manner with errors, and will let everyone know
>about it at that time.
>
>In the meantime I've written a file extractor that handles the sector
>headers embedded in the Anadisk images and it seems to work pretty well.
>It was just more complicated than it needed to be.
>
>--
>
>Sellam Ismail Vintage Computer Festival
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