In July 2014 I mentioned that I did some reverse-engineering of a Quay
900 computer system, based on the Quay 90F/MPS single-board Z80
computer and two CDC/MPI 9406 double-sided 8-inch floppy drives. Back
then I wrote a simple monitor ROM and a floppy disk formatter program,
but at the time I
On 2015-08-16 02:52, Noel Chiappa wrote:
Hi, does anyone know anything about the configuration of these boards?
(The document on BitSavers only covers the Q4B; the jumper configuration
on the Q4E is totally different.) They are 4MB quad QBUS memory cards;
PMI capable, I'm pretty sure.
I have
On 08/15/2015 11:18 AM, Douglas Taylor wrote:
I have a number of laboratory instruments that are from the 1990 time
frame. They produce digital data that is the digitized signal from a
detector, the data can be from 512 to 65K samples long. The ADC used
in these instruments is a 16bit
Most of these older module use successive approximation
converters. If you read them too fast, you'll only get a partial
conversion.
A number of manufactures made these modules. Analog Devices,
Harris, Beckman and several others.
Dwight
From: a...@p850ug1.demon.co.uk
To: cct...@classiccmp.org
I have a number of laboratory instruments that are from the 1990 time
frame. They produce digital data that is the digitized signal from a
detector, the data can be from 512 to 65K samples long. The ADC used in
these instruments is a 16bit 100ksample/sec design. The ADC is in a 3
by 4
I just realized that the toggling of pin 14 is thanks to the feature
of the uPD765/8272 that automatically polls all four drives. I mostly
have worked with WD controllers which don't do that.
So I still don't know why the TWOSIDED/ signal isn't being reflected
in ST3. I'll have to trace out how
At 12:56 AM 8/16/2015, Dwight wrote:
Most of these older module use successive approximation converters. If you
read them too fast, you'll only get a partial conversion.
I'll second that. The ones I have seen most often (in another industry) were
Harris.
For those who would like who would
On 08/16/2015 08:24 AM, dwight wrote:
I left a note there about using CRCs to do data correction. It is a
simpler method for software than normally use.
I posted a link on VCF about using GNU CRC RevEng--a great little
utility to aid in determining polynomials and initial conditions for
On 08/16/2015 08:46 AM, dwight wrote:
I'd always wondered why that was so.It has been handy to see which
were 360K as I don't think HD everhad the donut ( maybe rare ).Dwight
Where I saw the problem was with the Micropolis 77-track (single sided)
100 tpi drives.
--Chuck
I'd always wondered why that was so.It has been handy to see which
were 360K as I don't think HD everhad the donut ( maybe rare ).Dwight
On Sun, 16 Aug 2015, Chuck Guzis wrote:
Where I saw the problem was with the Micropolis 77-track (single sided) 100
tpi drives.
Their 35 track 48tpi ss
I was thinking that around this time, dual slop detectors were
becoming popular but it is unlikely this is your problem. If reading
a dual slope before conversion is complete, the value read would
be low in value, not just missing LSBs.
They were generally slower as well but often in the 16 or
I left a note there about using CRCs to do data correction. It is
a simpler method for software than normally use.
Dwight
Date: Sat, 15 Aug 2015 07:24:24 -0700
From: a...@bitsavers.org
To: gene...@classiccmp.org; classiccmp.org:On-Topic and Off-Topic Posts
cctalk@classiccmp.org
Subject:
On 8/16/2015 11:19 AM, Chuck Guzis wrote:
On 08/16/2015 08:24 AM, dwight wrote:
I left a note there about using CRCs to do data correction. It is a
simpler method for software than normally use.
I posted a link on VCF about using GNU CRC RevEng--a great little
utility to aid in
From: ccl...@sydex.com
snip
I believe that the earlier Micropolis 5.25 floppy drives worked the
same way. I recall that when they first came out, they'd mangle the hub
area of a floppy because the spindle motor often had been turned off by
the host. Eventually, the design was modified
- Original Message -
From: Ali cct...@fahimi.net
To: CCTalk Mailing List cctalk@classiccmp.org
Sent: Sunday, August 16, 2015 6:26 PM
Subject: No XT-IDE users?
Wow, I know it's not a DEC PDP but I was hoping
at least a few people used the darn thing. Would
it be better if I post in
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA512
Hi,
I have used it yes, and I'm actually quite happy with it - it wasn't
that hard for me to get the PCBs; I just uploaded them to one of the
PCB prototyping services out there (forgot which one, it has been a
while already, and brain cells get
On 08/16/2015 03:20 PM, Jay Jaeger wrote:
One issue with the capstan idea, though, would be direction.
Capstans really want to pull. Not very good a pushing. ;) So if
you did that, and you wanted to direction operation (required if you
can't stream the entire tape), then you'd need two sets
I found several of these while digging. Any interest?
Please contact me off list.
Paul
As the proud owner of an NtM Osborne 1 computer, courtesy of our own Jules
Richardson (and another list member), I made no delay in opening the case
to install a missing CPU. Jules was kind enough to let me know about the
missing part prior to handing the old girl over to me.
I'm sure you've
Be fun to have identified controller for first ibm pc to demo it
Sent from my Verizon Wireless 4G LTE smartphone
Original message
From: william degnan billdeg...@gmail.com
Date: 08/16/2015 4:31 PM (GMT-07:00)
To: General Discussion: On-Topic and Off-Topic Posts
Wow, I know it's not a DEC PDP but I was hoping at least a few people used the
darn thing. Would it be better if I post in VCF? Thanks for any input.
-Ali
On 08/16/2015 03:26 PM, Ali wrote:
Wow, I know it's not a DEC PDP but I was hoping at least a few people
used the darn thing. Would it be better if I post in VCF? Thanks for
any input. -Ali
Probably. I have both the original and the one (can't remember the
name) with the CPLD on it. Both
On Sun, 16 Aug 2015, Chuck Guzis wrote:
On 08/16/2015 03:26 PM, Ali wrote:
Wow, I know it's not a DEC PDP but I was hoping at least a few people
used the darn thing. Would it be better if I post in VCF? Thanks for
any input. -Ali
Probably. I have both the original and the one (can't
Hi Mike,
Sorry I no longer have any HP3000 gear, but have did make several videos
about my 3000s when I did. You can see them here:
https://www.youtube.com/user/CLCourtney/videos
Good luck - the 3000 was a great minicomputer in its day!
Lee C.
On Fri, Aug 14, 2015 at 7:01 PM, Mike Loewen
On 8/15/15 6:41 PM, Jon Elson wrote:
DDC made a number of hybrid ADCs, but I've never seen one that was 3 x
4! That's really big.
Some of the Data Translation modules were that big. The normally had the
block diagram / part number / and Data Translation silk screened on the
top of them. ADAC
On 8/15/2015 3:18 PM, couryho...@aol.com wrote:
Mike - this would be a good complete system for you Mike and good
it has tapes.
that may have the little cartridge drive in it too but beware the
cartridge drives they seem to all have gummy capstans... I ruined a
fos
On Mon, Mar 3, 2014 at 8:11 PM, Lyle Bickley
lbick...@bickleywest.com wrote:
After stating that I expected TSX Plus to be available generally
to the collector community this week, I have had a number of folks
request access to TSX plus via private FTP.
Please be a bit
We did a lot more debugging on the TC12 LINCtape controller.
We saw a 500ns glitch in the LMU MOTION signal that corresponded to a short
slowdown in tape speed. We will investigate this next week.
We entered the LINC instruction to check a single block (0707) in the left
switches and a block
Yes.
Although I'm no longer welcome there I'd still
recommend VCF as the place to go for PC-related
questions (next to our Chuck (G) of course ;-)
m
Mike (and everyone else thanks) for the input. That is sort of my feeling as
well - this list is geared toward older/bigger systems vs.
[Replacement Z80 in an Osborne]
What I did learn is that Z-80 were made in CMOS versions, and the Z84C is
one.
So what did I most likely do, here? Hose the CPU for sure? Collateral
damage on the board? Both / Neither?
Most likely neither (unless you put the CPU in the wrong way round or
On 8/16/2015 6:29 PM, Chuck Guzis wrote:
On 08/16/2015 03:20 PM, Jay Jaeger wrote:
One issue with the capstan idea, though, would be direction.
Capstans really want to pull. Not very good a pushing. ;) So if
you did that, and you wanted to direction operation (required if you
can't
There is a clear possibility that there are other problems
in the unit than the CPU chip.
Look at the signals on the buss to see if they all look
proper. I'm suspecting something load on the buss.
Dwight
Ali,
Definitely post at VCF. Hargle (Jeff) is usually lurking around. Krille
has been active in the development of the newer BIOS versions and might be
able to lend some insight.
I have an ancient Rev-1 XT-IDE that I use regularly, but that BIOS is
ancient so I have no experience with the
The RICM PDP-12 thread made me realize that I (nor I think David
Gesswein) ever posted our PDP-8 notes here. (We did post a link to the
Youtube video of the ceremony at VCF East.)
Anyway, here are David's notes:
http://www.pdp8.net/shows/vcfe15/slides/PDP-8_Restoration.html and also
his
I believe that is true, it is a SAR type of ADC. That is an import
piece of information there concerning reading the ADC too fast.
Because I have one instrument that is working properly I can use that as
a baseline to look at how fast the ADC is being pinged on.
This gives me something to
On 8/15/2015 12:40 PM, tony duell wrote:
I have a number of laboratory instruments that are from the 1990 time
frame. They produce digital data that is the digitized signal from a
detector, the data can be from 512 to 65K samples long. The ADC used in
these instruments is a 16bit
On 8/16/2015 8:24 AM, Al Kossow wrote:
On 8/15/15 6:41 PM, Jon Elson wrote:
DDC made a number of hybrid ADCs, but I've never seen one that was 3 x
4! That's really big.
Some of the Data Translation modules were that big. The normally had the
block diagram / part number / and Data
On 08/16/2015 10:15 AM, Jay Jaeger wrote:
More likely, apply the technology used on some 9 Track drives: a little
tension arm and then use servos to drive the supply and takeup reels,
and an encoder (*not* driven) that measures speed (in place of the
capstan on older drives).
Maybe--I
Thanks Al, I downloaded the assembler just in case. And to Chuck's point, it
always felt like the MSDN distribution was a poorly documented, disorganized
mess. I was not impressed.
The old Turbo C and new Watcom C are available freely for DOS 16 bit and people
say very good things of both.
On 8/16/2015 9:00 AM, Michael Thompson wrote:
We did a lot more debugging on the TC12 LINCtape controller.
We saw a 500ns glitch in the LMU MOTION signal that corresponded to a short
slowdown in tape speed. We will investigate this next week.
We entered the LINC instruction to check a
Howdy Eric,
Always a pleasure to hear from you!
The Zilog P/N of the chip is Z84C0008PEC, and it's further marked Z80
CPU with a datecode of 8904 - April of 1989?
In the interim, I've pulled that chip from the Osborne and replaced it with
the 'proper' Z80 from a Timex / Sinclair 1000; I did not
On Sun, Aug 16, 2015 at 8:48 PM, drlegendre . drlegen...@gmail.com wrote:
The Zilog P/N of the chip is Z84C0008PEC, and it's further marked Z80
CPU with a datecode of 8904 - April of 1989?
Assuming that your Z84C00 is not damaged, I think there's one
difference that might make it not work in a
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