The missing horizontal stripes could be ab LCD driver issue, LCD glass
issue, zebra strip issue or issue with corrosion on the LCD PCB.
Jeff Birt
From: M100 On Behalf Of Russell Pitman
Sent: Friday, December 31, 2021 7:28 PM
To: m...@bitchin100.com
Subject: Re: [M100] M100 Information
That is interesting, I did not know there was a 3rd version of the M100 PCB.
Let us know when you are able to upload the manual.
Jeff
From: M100 On Behalf Of Stephen Adolph
Sent: Friday, December 31, 2021 10:02 AM
To: m...@bitchin100.com
Subject: Re: [M100] M100 Information
Russell,
rect circuit diagram. I have continuity checked the switch SW3
and that is good. 6v is seen at the battery terminals.
I have noticed that Brad does a VR1 kit which might be worth sourcing, if
still available.
Thanks
Russ
Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=
>> I have been looking at the circuit diagrams and manuals for it but none
seem to match the motherboard
that is inside this model. Cap and resistor numbers are different.
That would be a very odd PCB. Kyocera even carried the same component
designations through to the Olivetti M-10. The
Have you measured the -5V supply to see what voltage it actually is? A low -5V
(closer to 0V) will make for a dim display.
Jeff Birt
-Original Message-
From: M100 On Behalf Of Scott Lawrence
Sent: Friday, December 24, 2021 6:50 PM
To: Model 100 Discussion
Subject: [M100] Tandy 200 lcd
Jamie,
Just wanted to check and see if you were successful in getting some new zebra
strips made.
Jeff Birt
From: M100 On Behalf Of Jamie Nichol
Sent: Tuesday, July 6, 2021 6:34 PM
To: m...@bitchin100.com
Subject: [M100] New zebra strips for M100 display — any interest?
Hey All,
A bit off topic but still vintage computer related...
Are there any TPDD Backpack owners who are also Fluke 9010A owners? We have
an experimental firmware option that will provide support for the 9010A.
This was created by request to be able to save/load test scripts to/from the
Fluke.
It
It may take a while to charge the memory battery. On the T102 the position of
the battery compartment allows any leakage to fall directly on the PCB. The
memory backup battery leakage tends to cause much more damage on the T102 as
well.
Jeff Birt
-Original Message-
From: M100 On
I suggest replacing the battery if you are going to be using the machine or at
least removing it at this time is you will not be using the machine. When (not
if) they leak the damage can be catastrophic. They are 30+ years old now and on
borrowed time.
I have the batteries in stock as does
The easiest way to pull these pots is to use a large soldering iron tip and a
big blob of solder to heat all 3-4 terminals at once. It is easy to pull out
when all leads are hot at once. They you can use solder braid or a solder
sucker to clean out the holes.
Most often you can take the knob
>> Not sure it is worth the effort to do that much surgery on the M100 ROM.
>> For software compatibility, I think it is more important to represent the
>> ascii codes in the same way as the M100 would use them.
So, my plan is to just map them as best is possible, and live with it.
I
Good work Steve. This would make it possible then to modify the M100->M10 ROM
to read the jumpers and choose correct table IF there is enough room in the
M100-M10 ROM. Or, I guess probably easier to is have 4 ROM versions, one for
each table and the user would need to burn the correct one for
Happy to hear it worked out for you.
Jeff
-Original Message-
From: M100 On Behalf Of Jamil Alioui
Sent: Saturday, October 23, 2021 9:38 AM
To: m100@lists.bitchin100.com
Subject: Re: [M100] Bleaching of yellowed plastic
Hi,
Thanks to Justin and Jeff for their valuable advice and
Disconnect the power input to the computer, i.e. external supply plug and/or AA
batteries. Wait 1 minute. Measure voltage across memory backup battery.
Jeff Birt
-Original Message-
From: M100 On Behalf Of ExPLIT | Pawel
Radomychelski
Sent: Friday, October 22, 2021 12:40 PM
To:
Say you are a new owner of an M100 and you try to load ‘file.ba’ which shows up
in the menu as ‘file.do’, what will you guess the problem is. You might try it
again and get the same result and get pretty frustrated.
If I copy ‘file.ba’ to my SD card and then it does not show up as being on the
You could use DOSBOX or some other virtual machine. They all take time to
figure out, but it is an option.
Jeff Birt
From: M100 On Behalf Of AvantGuard Systems
Sent: Thursday, October 21, 2021 4:11 PM
To: m...@bitchin100.com
Subject: Re: [M100] Recompile multiple BA files
In response
These are all interesting ideas but still require the user to know ahead of
time that the problem of mismatched extensions exists and how to work around
it. The LOAD"0:PROG.DO” might be the easiest thing to recommend once someone
realizes they have this problem, but then that also requires they
t a better user experience. Your thoughts?
Jeff Birt
From: Jeffrey Birt
Sent: Thursday, October 21, 2021 7:58 AM
To: 'm...@bitchin100.com'
Subject: RE: [M100] Recompile multiple BA files
Hi,
While 'Retr0Brite', i.e. using hydrogen peroxide to whiten plastic is a
bleaching process other types of bleach do not work the same. Bleaching agents,
hydrogen peroxide, chlorine bleach, etc. do not work exactly the same so can't
be interchanged for this use case.
If you want to learn
This would not solve the underlying problem(s).
A. New users of the M100 always get bitten in the butt by this BA/DO file
issue.
B. Once you learn it is a problem you still have the manual process of
making sure the sure the extension of the file is correct. Loading a .DO as a
Renaming the files is not the issue. The issue is that many text files are
incorrectly named as .BA. As you know if you try to load a text file labeled as
.BA the M100 will try to tokenize it on the fly, and it is not fast enough to
keep up.
Jeff Birt
From: M100 On Behalf Of John R.
That might work. I have also tried mixing a little glycerin with the acid to
make it more viscous. This slows down the reaction but does help keep it in
place.
Jeff
From: M100 On Behalf Of Francois Gurin
Sent: Monday, October 18, 2021 7:04 PM
To: m...@bitchin100.com
Subject: Re: [M100]
Soak in a mild acid such as vinegar or citric acid. Afterword rinse the coat
with WD-40.
It is possible to buy some nice new battery contacts now too. I did a video
recently about this after a friend gave me a tip about the new contacts being
available from Aliexpress.
Great work Brian!
Jeff Birt
-Original Message-
From: M100 On Behalf Of Brian K. White
Sent: Thursday, September 16, 2021 5:44 PM
To: M100 List
Subject: [M100] pdd.sh
Finally got TPDD2 support working in pdd.sh, including sector access, including
write, including the metadata parts
The disks were imaged using a SuperCard Pro which is a flux level disk imager.
It is a small board that connects to a PC type floppy drive and controls the
drive directly. It steps through the entire drive surface making a map of the
flux transitions so it can image/copy any disk. You could
If you have the equipment to make a disk from an image I have images of the
TPPD1 and TPPD2 disks at: https://github.com/Jeff-Birt/TRS-80-TPDD-Images .
I think Brian might have come up with a way to make a boot disk by attaching
the drive to a computer via serial as well. (Some sort of Python
Sounds great Jamie.
Jeff Birt
From: M100 On Behalf Of Jamie Nichol
Sent: Tuesday, August 10, 2021 7:46 PM
To: m...@bitchin100.com; m...@bitchin100.com
Subject: Re: [M100] New zebra strips for M100 display — any interest?
Hey guys,
Quick update. I have four displays on hand (thanks
It is fascinating how we are all discovering new things about these machines
30+ years after they were made.
Jeff Birt
From: M100 On Behalf Of Brian White
Sent: Wednesday, July 28, 2021 1:14 AM
To: m...@bitchin100.com
Subject: Re: [M100] Cassette woes
The 40mv was legit. Olivetti M10
>>But what about the white? Any suggestions on how to clean and improve its
>>look? Mine looks a bit yellowed
The yellow is the typically result of natural oxidation of the plastic. It can
also be from tobacco smoke, but the stench will give that away. I usually start
with a good washing with
From: M100 On Behalf Of Jerry Davis
Sent: Monday, July 26, 2021 7:55 PM
To: m...@bitchin100.com
Subject: Re: [M100] How to clean plastic?
Hey, Jeff
What do you use to apply the polish?
Jerry
On Mon, Jul 26, 2021 at 5:06 PM Jeffrey Birt mailto:bir...@soigeneris.com> >
Are you wanting to polish the clear plastic? If so, take a look at Novus
plastic polish. I have used it in the past, and it has worked well for me.
Jeff Birt
From: M100 On Behalf Of Earl Baugh
Sent: Monday, July 26, 2021 4:40 PM
To: M100@lists.bitchin100.com
Subject: [M100] How to clean
Steve,
The schematic looks just like the M100, down to the part names. The capacitors
leak just like the M100 whereas the T102 caps are not a problem.
The RS-232 drive section is like the M100, not the improved T102 version. The
option ROM socket is a ‘normal’ socket and the SysBus
On Monday, July 26, 2021, Jeffrey Birt mailto:bir...@soigeneris.com> > wrote:
Hi all,
I recently picked up an Olivetti M-10 which is just a bit different than the
M100. I have been looking for a version of TS-DOS for it but have not found
such a beast. Has anyone ever patched TS-DOS fo
Hi all,
I recently picked up an Olivetti M-10 which is just a bit different than the
M100. I have been looking for a version of TS-DOS for it but have not found
such a beast. Has anyone ever patched TS-DOS for the M-10?
Thanks,
Jeff Birt
I like to put a strip of painters tape over the buttons before taking the front
cover off. This will keep them in place for reassembling.
Jeff Birt
From: M100 On Behalf Of Jesse Lafleur
Sent: Thursday, July 22, 2021 11:16 PM
To: Model 100 Discussion
Subject: [M100] Tpdd reassemble
I have not torn my DVI apart yet, so I have not seen the drive up close.
Guessing it is a BLDC type, i.e. direct drive, not blet drive. I might try
to remove the spinning part of the motor (probably part you are giving a
push) and lubricate whatever bearings/bushings its shaft goes through. (Just
In the course of troubleshooting a perceived serial port problem on my M100
I found that when the DTR/DSR was looped back (and asserted) the voltage at
the DTR/DSR junction was 2.7V and the input voltage at M35 was only +1V.
There was 2V dropped across the 5.6K series resistor on the DTR output.
If anyone is curious about the PLA used it is from PrintedSolid.com, Jessie PLA
1.75mm X Beige 500. I like to call it ‘old computer beige’.
Jeff Birt (Hey Birt!)
From: M100 On Behalf Of Kevin Becker
Sent: Friday, July 16, 2021 10:05 AM
To: m...@bitchin100.com
Subject: Re: [M100] Sneak
-0500, Jeffrey Birt wrote:
Hi all,
A friend and fellow list member has developed a SD card storage solution for
the M100, T102, WP-2 NECs, etc. He sent me one a few months ago and I loved it
so much I encouraged him to offer them up for sale. It is a small device, about
25mmx40mmx75mm
he glitch in a RAM select
line and fixed it. The RAM pattern test ran clear. Then I ran this program
for a few days without a lockup and called it fixed.
Jerry
Original message ----
From: Jeffrey Birt mailto:bir...@soigeneris.com> >
Date: 7/9/21 7:59 PM (GMT
(so I could notice across
the house when it had died). But, in my case, I knew (or, STRONGLY suspected)
that the fault was in the power supply and that the rest of the machine was
likely fine.
On Fri, Jul 9, 2021 at 8:59 PM Jeffrey Birt wrote:
>
> Hi all,
>
>
>
> Burn i
Hi all,
Burn in test? I was just wondering what sort of program you guys like to run
as a burn in test of a computer you have just repaired. I modified the M100
test harness code so can run a continuous RAM test but that is not a really
useful test that everyone can use as it only works with
It's a ripple in the time/space continuum thing
Jeff Birt
-Original Message-
From: M100 On Behalf Of Josh Malone
Sent: Friday, July 9, 2021 8:04 AM
To: m...@bitchin100.com
Subject: Re: [M100] is the mailing list acting strangely?
Nope - not just you. I get replied often before I get
I use a TL866 which is a pretty good and lower cost unit.
Jeff Brt
From: M100 On Behalf Of Jeff Gonzales
Sent: Thursday, July 8, 2021 8:24 AM
To: m...@bitchin100.com
Subject: Re: [M100] Must-have ROMs
What gear do you need to burn your own ROMs? I didn't even think the chips
would
Hi all,
Here is the promised Quick Start video for the Backpack drive. They have all
been spoken for at this point but if you are interested in one let me know
so we can get an idea of how many to have made up on the production line.
This video is intended as a 'quick start' of sorts, to
I will also pick some up to have on hand, just in case. If I can help test let
me know.
Jeff Birt
From: M100 On Behalf Of Jamie Nichol
Sent: Wednesday, July 7, 2021 4:39 PM
To: Model 100 Discussion ; m...@bitchin100.com
Subject: Re: [M100] New zebra strips for M100 display ? any
can live with it as is (at least for now).
Lloyd
From: M100 mailto:m100-boun...@lists.bitchin100.com> > On Behalf Of Jeffrey Birt
Sent: Wednesday, July 7, 2021 6:38 AM
To: m...@bitchin100.com <mailto:m...@bitchin100.com>
Subject: Re: [M100] M100 / 102 Wanted
The partial mi
s affected.
Lloyd
From: M100 mailto:m100-boun...@lists.bitchin100.com> > On Behalf Of Jeffrey Birt
Sent: Tuesday, July 6, 2021 6:00 PM
To: m...@bitchin100.com <mailto:m...@bitchin100.com>
Subject: Re: [M100] M100 / 102 Wanted
Bum LCDs are often the most difficult thing to fi
That is quite the initiative. I’m not sure how many LCD problems are related to
zebra strips. Of the ones I have had with problem with or helped diagnose
a. Corroded contact pad and bad LCD glass, one row was bad, you can turn
glass 180 to verify.
b. Bad driver chip
Not a big
Bum LCDs are often the most difficult thing to fix. If the problem is a
corroded connection to the LCD glass there is a 50/50 chance of fixing it
and getting the glass lined back up properly. I have also seen a missing
horizontal line be due to a bad LCD glass. The driver ICs can also fail and
Hi all,
A friend and fellow list member has developed a SD card storage solution for
the M100, T102, WP-2 NECs, etc. He sent me one a few months ago and I loved
it so much I encouraged him to offer them up for sale. It is a small device,
about 25mmx40mmx75mm with the case on. It runs from a
Just to be clear, I did not suggest a heat gun, most of them would produce too
much heat. Rather I suggest a hair dryer which will be hot enough to soften the
adhesive but will not get hot enough to damage the plastic. AS Peter says, if
you don’t need to remove it then that removes the risk of
I would try heating the area, from the rear with a hair dryer. This should
soften the glue enough to allow popping it out. For a bit more protection of
the plastic you could cover the exposed part of the window with painter’s tape.
The idea is to get it warm, maybe 30C~40C but not so hot as to
I would be interested in the TPDD2 but would need it shipped to Missouri.
Jeff Birt
From: M100 On Behalf Of Francois Gurin
Sent: Wednesday, May 19, 2021 7:14 PM
To: m...@bitchin100.com
Subject: [M100] TPDD2 & Cambridge z88
Some time back I replaced the belt and had my TPDD2 working
the option ROM pinout even after switching to the JEDEC standard in the
system ROM.
On Wed, May 19, 2021 at 9:46 AM Jeffrey Birt mailto:bir...@soigeneris.com> > wrote:
I really doubt MS had anything to do with the ROM pinout. There were several
different ROM pinouts back in the day,
ded pinout).
In later versions, they clearly got away from Microsoft 'shackles'.
In the end, I don't think Tandy 'chose' the pinout. I think it was pushed on
them by Bill.
On Wed, May 19, 2021 at 8:34 AM Jeffrey Birt mailto:bir...@soigeneris.com> > wrote:
You are absolutely correc
d was loaded with easy to change EPROM sockets.
Regards,
Peter
------
Message: 2
Date: Tue, 18 May 2021 07:36:25 -0500
From: "Jeffrey Birt" mailto:bir...@soigeneris.com> >
To: mailto:m...@bitchin100.com> >
Subject: Re: [M100] Other things that used the Molex
Interesting. I think if Kyocera/RadioShack had not chosen to go with the stupid
non-standard pinout it would have been a more popular way of distributing
custom applications for the machine. The socket itself was a good idea to make
putting a chip in more idiot proof.
Jeff Birt
-Original
You can take the knob off, one tiny phillips screw, and dribble some Deoxit
where the shaft meets the top case (some will work its way inside). Then set
knob on and rotate lock-to-lock 3-4 times and repeat. Give the Deoxit time to
dry out and see if that fixed it.
They are a odd pot and
I carry them as does Arcadeshopper
https://www.soigeneris.com/memory-backup-battery-mbat1
Jeff Birt
From: M100 On Behalf Of Douglas Quagliana
Sent: Wednesday, May 12, 2021 9:40 AM
To: m...@bitchin100.com
Subject: [M100] Ordering a replacement NiCd for Model 100 - from where?
I
Hi Jerry! For me I think the image size limitation has been the biggest
tripping point, just from me forgetting. It is understandable though. I set up
a separate folder on my Onedrive for such things though so I can just provide a
link to the image without dealing with on the image/spam sharing
The VEE level should be fine about 4.65V. As long as it does not change when
you see the screen DIM. Since the LCD is fine in another computer that saves
checking things on it.
You can try checking the voltage at pin 4 of the LCD connector. This is the
contrast setting voltage after it does
If it is not beeping, then it is not booting. The first thing I would check for
is that both +5V and -5V are present.
Jeff Birt
From: M100 On Behalf Of Charles Hudson
Sent: Monday, May 3, 2021 5:57 AM
To: m100@lists.bitchin100.com
Subject: [M100] Bricked again
Nada.
-CH-
-
From: Jeffrey Birt mailto:jeffrey%20birt%20%3cbir...@soigeneris.com%3e> >
Reply-To: m...@bitchin100.com <mailto:m...@bitchin100.com>
To: m...@bitchin100.com <mailto:m...@bitchin100.com>
Subject: Re: [M100] NEC PC-8201(A) Display issues
Date: Sun, 2 May 2021 11:
oesnt work at all. Contrast is always locked to one position.
Kind regards
Pawel
On Sunday, 2 May 2021, Jeffrey Birt wrote:
> The unit does have an auto power off if you have not used it for 5 minutes or
> so. Is this what you are experiencing?
>
>
>
> Jeff Birt
>
>
&g
The unit does have an auto power off if you have not used it for 5 minutes or
so. Is this what you are experiencing?
Jeff Birt
From: M100 On Behalf Of ExPLIT | Pawel
Radomychelski
Sent: Sunday, May 2, 2021 9:20 AM
To: m...@bitchin100.com
Subject: [M100] NEC PC-8201(A) Display issues
>>Another objective is to develop a reliable method for tape duplication before
>>I damage or wear out the OEM distributions. I am thinking it might be
>>possible to make a digital copy of the OEM tape on my Win10 machine, using a
>>hi-fi tape deck as the playback source and Audacity as the
The only way I can see the memory battery making any real difference in the AA
battery life is if you use the machine so infrequently that the battery is
allowed to go flat. Then when you put a new set of AA batteries in they will
have to charge the memory battery up completely.
Jeff Birt
you can fix that M102 board, would be shame to throw it away.
However I did overheat that socket...
-Original Message-
From: M100 [mailto:m100-boun...@lists.bitchin100.com] On Behalf Of Jeffrey Birt
Sent: Monday, April 26, 2021 6:09 PM
To: m...@bitchin100.com
Subject: Re: [M100] Happy Earth
>>And that M102 board I donated, do you think you will be able fix it? Just
>>curious I also have the empty case and keyboard but no LCD if you or anyone
>>wants it.
I have a 102 with a bad LCD glass and other unknown problems. I was recently
able to get a few M100 LCDs, and the glass is the
Give it a rest, please...
Jeff Birt
-Original Message-
From: M100 On Behalf Of Robert J. Hutchins
Sent: Monday, April 26, 2021 6:56 PM
To: m...@bitchin100.com
Subject: Re: [M100] Happy Earth Day from my M100
"It is the left who have promoted the nonsense that the Earth is in danger"
>> There are plenty of places on the Internet where you can discuss your
>> ignorant beliefs.
This is not the place.
Nor is this a place for personal insults...
Jeff Birt
-Original Message-
From: M100 On Behalf Of Robert J. Hutchins
Sent: Monday, April 26, 2021 4:49 PM
To:
Yes, TASM is still available. The shareware version is included in the GitHub
repo I posted. I was also recently able to contact the author and register to
get the source.
With the source I was able to create a new assembly argument rule to more
easily support the Sharp lh5801 processor’s odd
A popular assembler from back in the day is TASM. It supports many different
processors including the 8085. I did a VS Code extension for it a few months
ago. The link to the GitHub repo and the video I did about it is below. There
is also a PDF in the repo to help get you started.
GitHub
Does the RTC drive an interrupt to service the KB? Interesting I did not
realize that.
Jeff Birt
From: M100 On Behalf Of Stephen Adolph
Sent: Friday, April 23, 2021 4:56 PM
To: m...@bitchin100.com
Subject: Re: [M100] Dead Keyboard
I suspect that there is a problem with the internal
I would also guess there is not one single correct color but a small range.
Typically, the raw plastic used will be produced by different companies at
different times to a specification. There will be variations even lot to lot
from the same manufacturer.
Jeff Birt
From: M100 On
It is odd that you only seem to get a response form the CTRL and BRK keys.
Although looking at the schematic just now I realize that the keys Brake,
caps, num, code, grph, ctrl and shift are all strobed by PBO all other keys
are strobed by PA0-7. Ports PA and PB both come from the 8155. Both ports
If you don’t find a local buyer I would be interested. If you can pack it up
safe I can provide the shipping label.
Jeff Birt
From: M100 On Behalf Of John R. Burns
Sent: Monday, April 19, 2021 5:47 PM
To: m...@bitchin100.com
Subject: [M100] anyone in San Francisco Bay Area?
I have a
I have them and Arcadeshopper does too:
https://www.soigeneris.com/memory-backup-battery-mbat1
Jeff Birt
From: M100 On Behalf Of ExPLIT | Pawel
Radomychelski
Sent: Saturday, April 17, 2021 5:33 PM
To: m...@bitchin100.com
Subject: Re: [M100] NEC PC-8201A 3,6V Barrel Battery Replacement
Measure the -5V supply rail. It could be low because the RS232 level shifter
chip has faults. Also check the +5V and -5V at the LCD itself to rule out a
connection issue (bad joint at connector or leading to connector).
Jeff Birt
-Original Message-
From: M100 On Behalf Of ExPLIT |
Message-
From: M100 On Behalf Of Eric LK
Sent: Wednesday, April 14, 2021 8:36 AM
To: m100@lists.bitchin100.com
Subject: Re: [M100] Need help fixing VEE on M100
"Jeffrey Birt" wrote:
> Welcome to the fun world of leaking electrolytic capacitors. Trace
> damage like thi
>>Good question. The STL file is somehow scaled wrong or drawn in units of feet
>>or even yards or something. Even when I load it in FreeCAD with the units set
>>to inches, the part comes out with dimensions like 0.1205 inches on the
>>longest side, which is ridiculous.
There are some
Welcome to the fun world of leaking electrolytic capacitors. Trace damage like
this is very common and if someone replaces the capacitors without properly
mitigating the damage the corrosion will continue to spread and get worse.
'Half-way' repairs cause as many problems as the original
Most ‘real’ alignment disks are written on special drives that are not only
very, very precisely calibrated but they can also vary the angle of the head.
This angled write somehow enhances the ability to detect alignment issues with
the use of an oscilloscope monitoring the head output (don’t
for the tutorial videos, Birt. They've been helpful! If I had a C=64
kicking around here I would definitely give DurexForth a try.
On Mon, Mar 29, 2021, 08:37 Jeffrey Birt mailto:bir...@soigeneris.com> > wrote:
This is the default behavior for most all vintage 8-bit Forth implementations.
To do a
| Modifying .S to indicate a stack underflow error would be reasonable. It's a
debugging tool, and not used by programs so it doesn't impact performance.
I’m not sure how that would work since .S has no idea what you think should be
on the stack at any given time. It can only show you what is
This is the default behavior for most all vintage 8-bit Forth implementations.
To do a bounds check might take 6-10 machine cycles for every word. This does
not seem like a lot, but it would have a noticeable impact on performance.
When I ventured Forth a few years ago I found that Forth
: Thursday, March 25, 2021 8:39 PM
To: m...@bitchin100.com
Subject: Re: [M100] In over my head? Or a Challenge!!
On 24/3/21 11:49 pm, Jeffrey Birt wrote:
> I suspect it would work by itself, but it will take a lot of it. I
> have used alcohol followed by a typical flux/PCB cleaner product
The black screen is an indication that the LCD is getting power but not
getting initialized properly. This is most likely because the system is not
booting properly. The RAM modules can fail causing a no boot situation, or
it might be stuck in rest, etc.
If you want, I'll have a crack at
...@bitchin100.com
Subject: Re: [M100] In over my head? Or a Challenge!!
wrt cleaning the PCB, would a standard flux remover also work?
On Wed, Mar 24, 2021 at 8:52 AM Jeffrey Birt mailto:bir...@soigeneris.com> > wrote:
I was also reminded this morning, by another email, of the
.
--Brad
On Tue, Mar 23, 2021 at 8:00 AM Jeffrey Birt mailto:bir...@soigeneris.com> > wrote:
I did a video a while back about the first steps in troubleshooting a vintage
computer. In a nutshell think ‘PCR’ Power, Clock, Reset. Make sure that all
power supply rails are functional, then
I did a video a while back about the first steps in troubleshooting a vintage
computer. In a nutshell think ‘PCR’ Power, Clock, Reset. Make sure that all
power supply rails are functional, then check that you have a good clock signal
and finally check for a properly working reset. Without these
On the M100s I have found most of the caps tend to leak (and cause PCB damage).
While I am NOT a proponent of 'recapping' every piece of vintage gear out there
on the M100 I do a full recap on every one of them.
The -5V also goes to the RS-232 circuitry so if something is amiss there it can
the media making a
distorted signal?
Is it actually the opposite, that the way they achieved higher density is by
using less sensitive media driven by a stonger head?
On Sat, Mar 20, 2021, 8:35 AM Jeffrey Birt mailto:bir...@soigeneris.com> > wrote:
Oh, sorry I misread what you
microcontroller that speaks TPDD protocol and has integrated FDC
function could interface with a modern FDD.
..steve
On Sat, Mar 20, 2021 at 8:20 AM Jeffrey Birt mailto:bir...@soigeneris.com> > wrote:
High density disks, both 3.5 and 5.25, require a much higher flux level to
write. A
High density disks, both 3.5 and 5.25, require a much higher flux level to
write. A system designed for DD disks will not be able to write to them
reliably. Some folks have tried HD 3.5” disks in an Amiga or Mac for example
only to find that it reads for a while but after a few weeks or months
Awesome, thanks for sharing.
Jeff Birt
From: M100 On Behalf Of Stephen Adolph
Sent: Thursday, March 18, 2021 7:14 PM
To: m...@bitchin100.com
Subject: Re: [M100] TPDD service manual
John, couldn't make that work..login prevented.
so I did it brute-force.
If they won’t ship directly to you, I would be happy to forward them to you.
I’m in the USA.
Jeff
From: M100 On Behalf Of Stephen Adolph
Sent: Thursday, March 18, 2021 6:21 AM
To: m...@bitchin100.com
Subject: Re: [M100] molex ic socket
Too ad for me this seller wont ship to Canada.
I was wrong about the comment. Gadget was saying he had inherited some when a
friend passed and did not know what they were for until seeing the video.
Jeff Birt
From: M100 On Behalf Of Jeffrey Birt
Sent: Tuesday, March 16, 2021 6:16 PM
To: m...@bitchin100.com
Subject: Re: [M100] PC-8201
Hi,
If you are in the USA I would be interested. The PC-8300 is one that still
eludes me.
Jeff Birt
From: M100 On Behalf Of Montana Quiring
Sent: Tuesday, March 16, 2021 9:41 PM
To: m...@bitchin100.com
Subject: [M100] nec pc-8300
Hello everyone,
I'm a long time lurker. I used
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