I'm thinking one serial and one cassette. The 8251 for the cassette.
I can't make out all the chips at the pins? The board was hand laid out. Is
there nothing on the bottom but traces?
Dwight
From: cctalk on behalf of Ethan via cctalk
Sent: Tuesday, July 10,
I've had the goo from the adhesive of 5.25 inch 360k disk come through the nice
liner and make gobs on the disk. I tried several thing but found that
isopropanol worked without removing any of the magnetic material ( maybe s tiny
amount that was likely loose already ). I'm not saying it would be
I don't recall the concentration I used. I would recommend not using it for
most conditions. I recall that I'd tried various other cleaning methods. I
recall using water, water/detergent and may have even tried windex(?). None of
the other things would touch it. The stuff on the surfaces was the
I forgot one
Butter. Also needs detergent cleaning afterwards.
Dwight
From: cctalk on behalf of dwight via cctalk
Sent: Wednesday, July 11, 2018 10:29:41 AM
To: Al Kossow; General Discussion: On-Topic and Off-Topic Posts
Subject: Re: 8 inch floppies
Hi Al
I have a line on a CD and may be find some documents to go with it. A friend
has this and I hope to get a copy next week on Tues or Wed. Are you going to be
at the Museum next week. I don't know where you office is on the East bay side.
It might be closer.
Dwight
__
d, 11 Jul 2018, dwight via cctalk wrote:
> Next is the smooth orange oil hand cleaner. ( not the stuff with pumas
> ). Really cleans things great and good for killing ants. Again, rinse
> maybe it might need a little detergent and then rinse.
Don't use pumice to clean off the pumas.
I may be that the 300 required some special init sequence to the processor. It
seems like I recall that it needed to do a scan to initialize a couple of
values. This may make it not work on a Sparcstation 5. I don't recall if we
shipped units with this problem or if they made a rev of the silico
Hi Al
So, do you still need the CD?
Also, my friend may have some manuals. I don't know if it is just Solaris stuff
or HaL specific.
Dwight
From: cctalk on behalf of Al Kossow via cctalk
Sent: Thursday, July 12, 2018 3:32:12 PM
To: General Discussion: On-To
I understand that HxC has a hard sectored working on the Gotek for H89/H8. They
are having issues with the timing restrictions for N* hard sectored.
I've thought some about modifying a Gotek to use on my Nicolet but after some
thought, realized it would be much easier to use something like an ar
2.88 might be pushing the ability of a 72MHz processor. Also things like buffer
size become an issue. For the Gotek, it is somewhat limited. One of the newer
processors like the STM32F407, it might be possible. The Gotek uses an older
generation processor that has limited resources. Also, the wa
I still don't know for sure which way to do 8 inch compared to 5.25. I usually
try to write both ways but soon forget which is which.
It won't do any good to tell me as I'll still forget. I just remember the 8
inch drives were different.
Another good quiz question is where the index hole was on
HaL compiler, no
license required ).
Dwight
From: cctalk on behalf of dwight via cctalk
Sent: Thursday, July 12, 2018 12:06:59 PM
To: Al Kossow; General Discussion: On-Topic and Off-Topic Posts
Subject: Re: Anyone have a HALstation 300 install CD?
I may be
One thing that bothers me is the continued emphasis on arithmetic and not on
mathematics. The kids growing up today will rarely be more than a few feet from
a calculator. The first thing on the math test was the "No calculator allowed".
I'm not saying that they shouldn't be taught arithmetic but
Hi
I'm trying to assist Jeff with HxC to create a Gotek that can work with the
North* hard sectored disk. It has been problematic because of timing
constraints. Jeff has been working with several in the US but it is difficult
to see what factors are important, working remotely.
Jeff is in Par
It might be worth saving the bases and buying "grain of wheat" lamps to rebuild
the lights. I see ~70ma 6v lamps available. That sounds similar to the original
specification.
Dwight
From: cctalk on behalf of Brent Hilpert via
cctalk
Sent: Wednesday, July 25,
See 946 fairchild for pinout.
Dwight
From: cctech on behalf of Chuck Guzis via
cctech
Sent: Wednesday, September 12, 2018 12:39:44 PM
To: Peter Van Peborgh via cctech
Subject: Re: Unknown US manufacturer - try again
I suspect that it's from a trainer of some
I had a problem with brick power supplies a number of years back. I found an
issue that caused them to fail. I had about ten of them on the same power
switch. You'd think this would not be an issue but it is.
You see it works like this, each one had a transformer in it. When you
disconnect the
Its a shame it wasn't in the complete unit. Unless someone actually erases it,
core memory will hold data until the sun swells up, as a red giant, and toast
the earth.
One always wonders what one would find on these old cores.
Dwight
From: cctalk on behalf of
All the molten lava is done. You could still smash it with a lava rock.
Dwight
From: cctalk on behalf of Chuck Guzis via
cctalk
Sent: Friday, September 21, 2018 11:36:25 AM
To: Fred Cisin via cctalk
Subject: Re: Advice requested on proper disposal of Seagate S
I'd think a nice blast with a oxy-acetylene torch should do what is needed.
Even if it doesn't melt the disk, it will surely exceed the Currie point and
all data is gone.
Dwight
From: cctalk on behalf of Jerry Weiss via
cctalk
Sent: Friday, September 21, 20
Nicolet 1080 is 20 bit data but has 16 bit address space. No stack functions.
It has a register called link but that is only a single bit carry. Subroutines
use the first address to store the return, meaning they were not recursive
without something to save the returns ( I think dec did this too
CHM has these in their collection. Where are you located at? They don't look
really complicated. I'd think one could make one if they had a schematic.
Dwight
From: cctalk on behalf of Josh via cctalk
Sent: Monday, October 8, 2018 9:42:22 AM
To: General Discus
These machines used at least two different key switches, that I've seen. I've
been looking for a broken key switch and the one a friend had was different.
Mine has a broken post on one key.
Dwight
From: cctalk on behalf of drlegendre via cctalk
Sent: Sunday,
I had an Ultra Sparc machine that ran continuously for more than 5 years except
for maybe 2 power outages and a couple time to vacuum it out. The only failure
was one day the disk drive let out a stream of smoke. It was a tantalum
capacitor. It burned the board. IT was going to give me a new dri
My Nicolet did the same thing it would load 0 into the intended start location
( on my machine it was a jump to 0 ).
The front panel worked fine otherwise. It turned out to be some missing clocks
because of a bad 7474. Strange that a common problem on different machine
created by completely di
These sound really cool but I suspect the number of people with a Univac 422
are quite limited. Even those with Univac panel of any kind are quite limited.
I see the web page has a OCR of the text. A photo copy of the manual would be
great as well.
Dwight
From: c
I was curious. It would seem that it would be easy enough to make an emulator
or simulator for but the OCR is really bad.
There may be one out there. It would be a shame if yours was the last one.
Dwight
From: ED SHARPE
Sent: Sunday, November 4, 2018 9:00 AM
To:
This is great work, Rich. It is like looking at dinosaur bones and trying to
figure what it was eating.
Dwight
From: cctalk on behalf of Richard Cini via
cctalk
Sent: Sunday, September 27, 2020 7:07 AM
To: Discussion: On-Topic Posts Only
Subject: SCP/Microsoft
It is going to need a lot of contact cleaning.
The one thing I like is the carry design the Zuse used. Really fast for relays
but not of much use for solid state.
Dwight
From: cctech on behalf of osi.superboard via
cctech
Sent: Thursday, October 1, 2020 6:07 AM
I'm sorry Paul, I didn't know you were talking about the carry circuit or I'd
have replied. I don't recall where I saw the circuit described but with relay
contacts, the carry was basically as fast as the sum was created. It was kind
of a parallel operation. It didn't require different relay coi
Look at the Shugart 800 manual. It shows a similar adjustment for the pad. The
head may still touch the disk though when the pad is lifted on the 800. Maybe
not a good idea but how it was done. Do make sure the pad is clean and flat.
Dwight
From: cctalk on behal
I suspect much of the electronics is fine. It would be good for someone wanting
backup cards. The front panel is really sad.
I wonder where Dale found them?
Dwight
From: cctalk on behalf of jim stephens via
cctalk
Sent: Sunday, October 11, 2020 5:52 PM
To: Gene
Most components can stand soldering temperatures. It is clear that it was only
hot enough to melt plastics. That isn't even hot enough to damage boards. It is
wasn't powered at the same time, it is unlikely to have been harmed. I've seen
cases where there were flames in the board area and parts
I'm not too sure Hackers will have someone that is into Discrete Math. It is
way beyond what a typical engineer will go through to get a degree. It is not a
course someone would take without expecting to get into theoretical mathematics.
Dwight
From: cctalk on b
From: cctalk on behalf of Bill Gunshannon via
cctalk
Sent: Monday, October 12, 2020 1:54 PM
To: cctalk@classiccmp.org
Subject: Re: Tutor needed for college student
On 10/12/20 4:29 PM, dwight via cctalk wrote:
> I'm not too sure Hackers will have someone that is into Discrete Mat
That is way smaller than the AGS.
Dwight
From: cctalk on behalf of Gavin Scott via
cctalk
Sent: Friday, October 16, 2020 6:04 AM
To: rice43 ; General Discussion: On-Topic and Off-Topic
Posts
Subject: Re: Control Data 449 Special Miniature Computer from 1967?
I have one of the NC4016 boards ( I forget which one ). I added a XT floppy
controller and a XT MFM disk controller. I made some other hardware for doing
byte stuff faster. Using address -1, I could access it faster as a short
literal. I had a 8 bit barrel shifter there. It came in handy for the
I've not had issues just soldering the wires on. I'll admit I do use leaded
solder.
Dwight
From: cctalk on behalf of Fred Cisin via cctalk
Sent: Wednesday, November 11, 2020 1:02 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: Soldering DB
Is there a terminator on both ends. If not it is a static 15 ma.
Dwight
From: cctalk on behalf of Eric Smith via cctalk
Sent: Monday, November 30, 2020 2:52 AM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Radio Shack 8MB hard disk for Model II
There was a little known 68K machine. It was the Canon Cat. Although, it was
generally not intended as a development machine, in its short life, several
applications were developed.
It was primarily sold as a word processor ( quite powerful one at that ). It
had Forth running under the word proc
there is a sing rail that guide the head. At the back of the rail is a small
nylon tab that holds it in place. The way they mad it, it is over stressed and
will have failed. This means the rail is not held down securely. Eventually the
rail will pop up, not being held down securely any more. You
Sunday, January 24, 2021 3:13 PM
To: dwight ; General Discussion: On-Topic and Off-Topic
Posts
Cc: Fred Cisin
Subject: Re: personal history of personal computers
On Jan 4, 2021, at 1:31 PM, dwight via cctalk wrote:
>
> There was a little known 68K machine. It was the Canon Cat. Although
I believe Jack Rubin has taken pictures of his repair. He frequents this
message board.
Dwight
From: cctalk on behalf of dwight via cctalk
Sent: Sunday, January 24, 2021 5:16 PM
To: Chris Hanson ; General Discussion: On-Topic and
Off-Topic Posts
Subject: Re
My problem with words such as DAA is that I constantly have to look them up to
see exactly what they actually do. Finding alternate uses it all about knowing
what they actually do. I know what they were put there for ( to keep banker
happy ).
I constantly see people claiming how much better deci
If we'd thought about it we could count to 1023 on our fingers.
Dwight
From: cctalk on behalf of Chuck Guzis via
cctalk
Sent: Friday, January 29, 2021 6:19 PM
To: dwight via cctalk
Subject: Re: APL\360
On 1/29/21 5:55 PM, dwight via cctalk wrote:
, February 1, 2021 7:59 AM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: APL\360
On Sat, 30 Jan 2021 at 02:56, dwight via cctalk wrote:
> I constantly see people claiming how much better decimal is than the English
> system of meassurment.
Um. I am a native English speaker, a
I'm curious as to how the sampling code looks. Do you use the timers?
Dwight
From: cctalk on behalf of Mattis Lind via
cctalk
Sent: Wednesday, February 3, 2021 5:01 AM
To: Al Kossow ; General Discussion: On-Topic and Off-Topic
Posts
Subject: Re: Greaseweazle
I think it really depends on what reader he is putting it on. If it is a
standard newer 8 bit reader, the ASR33 punched tape is fine.
Dwight
From: cctalk on behalf of Steve Malikoff via
cctalk
Sent: Friday, March 26, 2021 2:15 PM
To: General Discussion: On-Top
Be careful with the cassette tapes. Many of the pressure pads have gone bad.
Playing them can cause the tapes to get folds that will make the tape data
difficult to extract. Most tapes can be opened up and the pressure pads
repaired.
Dwight
From: cctalk on beh
I recall we had a motor generator and fluid cooling for the 3033 we had. We
also had 2 smaller ones as well ( forget the numbers ). They all ran 360 code..
It is astounding how far things have come from that time.
Dwight
From: cctalk on behalf of Brent Hilpert v
The rivets are likely more of a safety thing than an issue warrantee repair
thing. The inside of a Apple II is intended to have user access. The switching
supply has 300 to 400V DC inside. Definitely a potential lethal hazard.
I hate those filter caps. I had one go at the last Maker Faire ( no mo
We used to use DC #4.
As an example, I had a ZX81. I added a RAM pack and had to be real careful
about wiggling or moving the AX81. I put DC #4 on the pins. One could drop the
computer with the RAM attached and it wouldn't lose a bit.
I don't like deox as it has chemical actions that continue ove
Hi Chris
I had a Brother daisy wheel that would do a single step of the stepper and a
second strike, for bold. You need to have the right esc sequence. Just about
every printer is different until HP had a standard( pscl5 as I recall ).
Dwight
From: cctalk on b
How you'd do such in Forth depends on the threading method. You have Indirect
threaded, direct threaded and call threaded. As you move to the right, they are
faster and easier to add optimization but harder to deal with some of the
higher level operations like Create Does> ( older Forth would be
Recompiling Forth was always such a trivial process, there was no reason to not
recompile itself using itself. It was also a good check of the output. One
could compare the output and check any differences to ensure that they were
intended. One could run it twice again as a check as well.
It wou
It will be at the CHM. The museum is still closed but VCF will be happening. To
be consistent with current Santa Clara covid conditions, bring your mask.
see: https://vcfed.org/wp/festivals/vintage-computer-festival-west/
I hope to see you all there.
Dwight
Vintage Computer Festival West 2021 –
I wonder what would be needed to connect a C64 module. I have an 800 but no
C64. I have a Forth module for the C64 that I'd like to fiddle with.
Dwight
From: cctalk on behalf of Kevin Lee via cctalk
Sent: Wednesday, August 11, 2021 12:51 PM
To: General Discuss
DSP processors, like the 2100 series of Analog Devices, one single instruction
that would take value from one array and multiply it by a value from another
array and then add it to another array, while incrementing the indexes.
I'd say that was CISC like.
Dwight
Of course, Busicom was the first programed microprocessor driven calculator, it
wasn't the first calculator using calculator ICs. That is what Busicom was
trying to compete with, when going to Intel in the first place.
Dwight
From: cctalk on behalf of Fred Cisi
Most of these older fused PROMs are of comparable speed in newer EPROMs or
E2PROMs. Open collector is a hassle but not too much. One can create the needed
circuits using surface mount parts for size reduction.
A hassle but not out of the question. You usually have to go to a larger ROM
size so i
If you only need a single drive and it is single density floppies, you don't
need a MSD-800 and a MSD-720 to run the ICE-85. You can use what we call a
Series II. It came with a small number of multibus slot. As I recall, we used
to run ICE-80s and ICE-85 on a Series II. We may have had the driv
Oops, I didn't see Dave's post yet.
Dwight
From: cctalk on behalf of dwight via cctalk
Sent: Wednesday, October 13, 2021 4:30 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: WTB/WTT: Intel MDS-800
If you only need a single dr
I also agree, it looks like the MP7-03 with some I/O buffering. My guess is
that the connector on the back is similar to the interface to the SIM4-01.
There would be address, data and a strobe to do the programming.
The way it works on the SIN4 setup is that the programmer supplies the timing
fo
specified.
Dwight
From: cctalk on behalf of dwight via cctalk
Sent: Sunday, October 31, 2021 6:53 AM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: Mystery 1702A(?) EPROM Programmer
I also agree, it looks like the MP7-03 with some I/O
The trickiest protection I've seen is where there is a hole punched through the
disk on one track. The idea is that the protected program writes to that track
and expects to see a failure to read that track.
Dwight
I have had an interest in the 4004 for a number of years. I've acquired a
SIM4-01 that I've used over the years to read and program 1702A EPROMs. I've
recently also located a copy of Tom Pittman's resident 4004 assembler. Quite
remarkable when you realize that that it was a complete two pass ass
The rarest 4004s are the grey trace with a black dot, instead of the gold dot
for pin one.
I have two grey trace but with gold dot. I believe these are older than the
grey trace with black dot.
Although, as originally sold, the 4004 was a Harvard architecture, it could be
made to be, easily, ma
Wasn't it Jim that had the house overlooking the Pacific ocean that was off
Skyline Blvd?
Dwight
From: cctalk on behalf of Chuck Guzis via
cctalk
Sent: Thursday, November 25, 2021 12:42 PM
To: Fred Cisin via cctalk
Subject: Re: Jim Warren has passed away
On
If it was fully functional, maybe about 48000/20.
Dwight
From: cctalk on behalf of Chris Zach via cctalk
Sent: Sunday, November 28, 2021 11:31 AM
To: Stan Sieler ; General Discussion: On-Topic and
Off-Topic Posts ; Stan Sieler via cctalk
Subject: Re: Datapoi
Do note that Fred last line can be important.
If you take a disk that is a 96 tpi and write something on a clean disk, you
should be able to take it to a 360k drive and read it. If the disk was use ona
360k machine and you over write anything that was previously on it, it will
unlikely read on a
I/O addresses for the 8080 come to mind.
Dwight
From: Chuck Guzis via cctalk
Sent: Sunday, November 3, 2024 3:36 PM
To: Mike Katz via cctalk
Cc: Chuck Guzis
Subject: [cctalk] Re: Self modifying code was HCF
On 11/3/24 14:48, Mike Katz via cctalk wrote:
> Though
Thanks Tony,
So no special curcuit needed, just drop the voltage with capacitor or resistors
and a bridge.
Dwight
From: Tony Duell via cctalk
Sent: Friday, November 8, 2024 8:53 AM
To: General Discussion: On-Topic and Off-Topic Posts
Cc: Tony Duell
Subject: [c
I agree, it isn't a copy type operation. It is a creation type operation.
The cats eye is created by two tones written such that it is one cycle
different per revolution. Each tone it offset by one half of the track width.
Cats eye don't tend to work well with digital sampling scopes unless they h
A small laser interferomenter and a screw driver could be used, once one
determined the center of the track by magnetic material and a microscope. Some
what special equipment but not all that special, now days.
Years ago, I went to a Seagate building to help a friend with a servo writer
problem.
I'd think a diode, white LED and a resistor would make a good enough strobe.
Maybe 2 resistors to isolate the AC lines enough a little better.
Dwight
From: Tony Duell via cctalk
Sent: Wednesday, November 6, 2024 8:39 AM
To: General Discussion: On-Topic and Off-Top
stors.
From: Chuck Guzis via cctalk
Sent: Wednesday, November 6, 2024 10:22 AM
To: dwight via cctalk
Cc: Chuck Guzis
Subject: [cctalk] Re: Running DOS executables on other versions of DOSRe:
Looking for Sharp PC-5000 disk drive (CE-510F or possibly MZ-80B)
On 11
What I see now has several issues. One I fear is a thing called fidelity. Like
humans passing some massage on through a chain people only worse. No machine
will recognize that the message got lost, along the way. Right now, we have no
way to determine how many AI levels the information has gone
> A simple home experiment:
>
> Find two points, such a hill/mountain-tops that are visible from each
> other, but 10 or 20 miles, at least apart east/west..
>
This is not sufficient to prove the earth is spherical. This method was used to
calculate the diameter of the earth, already knowing tha
Once you have the lock off you can take it to a locksmith and have a new made.
That is what I did for my computer.
Dwight
From: Tony Duell via cctalk
Sent: Wednesday, April 9, 2025 8:26 PM
To: General Discussion: On-Topic and Off-Topic Posts
Cc: Tony Duell
Subj
It all depends on what one means by a computer that one could do useful things
on. A fellow named Tom Pittman wrote a 4004 assembler that ran on the SIM4-01
board, using a teletype's tape reader as the source code and the intermediate
output for the 2 pass assembler. This assembler was released
There was little he didn't know about data storage methods. As far as I can
recall he always treated others with respect. He recovered some 8 inch floppy
data for me once that I didn't have the right setup for. I considered him as
one of those I'd really have like to meet in person.
Rest in peac
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