Hi Evan and others who might have been wondering, I managed to find
out what happened to the Burroughs B7800 that was "under the stairs"
at Monash university.
The good news is that the interesting parts, namely the indicator
panels, have been saved by the Monash Museum of Computing History.
They a
> 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
Thanks for the input, gents..
Sigh.. and here I sit, yet again, with neither a logic analyzer nor a
decent digital scope. Unless something comes up, looks like I'll have to do
it the hard way, as usual - heh.
At least the machine doesn't have a totally scrambled brain, with the
correct CPU - so i
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 exhib
[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
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 error
On Sun, Aug 16, 2015 at 8:48 PM, drlegendre . 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 circuit that
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
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
>>
> 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
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 di
On Sun, Aug 16, 2015 at 6:20 PM, drlegendre . wrote:
> 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?
Actually it's surprising that the CMOS Z80 didn'
On 08/16/2015 06:18 PM, Steven Hirsch wrote:
What is the "Chuck mod"?
I'll try to make this brief (ha!). One of the problems with the
original XTIDE is that the data bus on a regular ATA drive is 16 bits.
(There used to be a mode that could be set to allow an ATA drive to
support 8-bit t
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 remember
- Original Message -
From: "Ali"
To: "CCTalk Mailing List"
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 VCF? Thanks for any
input.
-Ali
-
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
Date: 08/16/2015 4:31 PM (GMT-07:00)
To: "General Discussion: On-Topic and Off-Topic Posts"
Subject: Re: No XT-IDE
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 alrea
I found several of these while digging. Any interest?
Please contact me off list.
Paul
I don't have a need for it, yet anyway
Bill Degnan
twitter: billdeg
vintagecomputer.net
On Aug 16, 2015 7:26 PM, "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 po
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 o
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 wor
-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 rust
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 8/16/2015 3:22 PM, Chuck Guzis wrote:
> 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 p
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
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.
Marc
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 know
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 Translatio
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 100ksample/sec
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 go
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 ta
>
> > > On Mon, Mar 3, 2014 at 8:11 PM, Lyle Bickley
> > > 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 numb
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
wrote
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 det
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 drive
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
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
CRCs.
> 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 mod
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
> Subjec
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 more
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 li
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 two
I've just added to yesterday's list of vintage computer items that need
to find a good home.
Details, part numbers, and descriptions can be found here:
http://www.hpfriedrichs.com/hpfparts/hpfparts.htm
Thank you to several classiccmp members who corrected my earlier post.
Some of the parts I
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 100ksa
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.or
> 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 it
My references to pin 14 should have been to pin 10 for the TWOSIDED/
signal. Pin 14 is the SIDESELECT/ signal which was working fine.
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