On Wed, Oct 25, 2023 at 12:53 AM Doug Jackson wrote:
>
> I see that there are component changes around the Telephone Modem interface.
>
> Here in Australia, we used CCITT for our modem standards, so I modified my
> M100 to use CCITT V.21 tones (1750/1850Hz) instead of Bell 103 tones
> (1270/107
On Sun, Feb 26, 2023 at 6:00 PM Mike Stein wrote:
>
> Most VoiP systems don't play very well with old tone-encoded protocols like
> modems or FAX machines, but if you have a POTS line or can get it to work
> with VoiP then most modems will let you dial out with either TT or pulse and
> also ans
Hi,
I'm not familiar with the 102, but on the EU Olivetti M10, the
internal modem was disabled by removing a few parts (including the
line transformer) and shorting out the RX operational amplifiers on
the solder side of PCB. I've tried to restore the functionality of the
internal modem of my Olive
On Fri, Sep 25, 2020 at 11:45 PM Bert Put wrote:
>
> As an owner of a M-100 while in Australia, I remember that we were
> forbidden to connect the built-in modem to the Australian telephone
> network. We had to use an external modem. I do not know if that is the
> same in the UK, but it's quite
On Thu, Aug 20, 2020 at 12:11 PM Terry Stewart wrote:
>
> >So for example a 40H175 is replaceable with a 74HC175 which is surely
> >easier to find.
> >However, if one wants to absolutely have the old "exact" replacement,
> >then one must look for those Toshiba old chips.
>
> Hi Frank,
>
> Thanks f
Hi Terry!
On Thu, Aug 20, 2020 at 11:16 AM Terry Stewart wrote:
>
> Hi Guys,
>
> Philip Avery and I had fun fixing my NEC PC-8201a recently. I always write
> these things up as I'll invariably forget what I did when I want to revisit
> these things later.
>
> Anyway, if you are interested here
Sorry for the OT,
On Thu, May 7, 2020 at 2:22 PM Jeffrey Birt wrote:
>
> I saw the video was out but have not watched it yet. It makes me happy to see
> folks around the world being able to fix their C64 and Amiga cases.
>
> I have to admit to being indifferent about the C64 clone PCBs. Hans (bw
On Thu, Aug 22, 2019 at 4:26 PM Stephen Adolph wrote:
>
> I tried JLCPCB for a new PCB, which would have cost me 40$ US at oshpark. I
> got 5 boards for 2$ CDN shipped to me in 2 weeks total from submission to
> boards in hand.
>
> Wow!
>
> Think I know where I am getting boards made from here o
On Wed, Jan 30, 2019 at 1:16 AM Stephen Adolph wrote:
>
> A big deal in some cases is a wide voltage tolerance. For ram circuits you
> may need 2v to 5v.,
of course that's an issue too: HC/AHC works fine down to 2V, HCT does
not by design.
Frank
C/AHC logic and suitable RAM chip usually end up
in the 0.1 to 3 uA standby current @3.3V.
My setup lower current limit is 0.1uA, so many modules I've checked
may have been better than that.
On Tue, Jan 29, 2019 at 4:53 PM Mike Stein wrote:
>
>
> - Original Message -
> Fro
On Tue, Jan 29, 2019 at 6:38 AM Eric LK wrote:
>
> So yesterday I bought the collection from Scotty, which was I must say
> in even better condition that the pictures show :o)
>
> Not only I'm now the proud owner of a mint condition fully functional
> M100 with its TPDD2, but I should have enough
Hi Mauro,
On Wed, Dec 5, 2018 at 10:52 AM wrote:
>
> Long story short:
>
> SUCCESS!! My M10 is working fine.
> Thank you everyone for the huge help and usefull advise provided in the past
> and recently.
> A BIG THANK YOU to Francesco Messineo I think you neiled the i
On Mon, Dec 3, 2018 at 11:00 PM Mauro Pintus wrote:
>
>
> Checking some signals with the oscilloscope it looks like it is looping after
> a fix time without completing the boot.
>
> Francesco Messineo (another user of this list) wrote me in this days to offer
> some
On Sat, Dec 1, 2018 at 3:10 AM Chris Fezzler wrote:
>
> My friend and I want to show some of our kids how journalists filed stories
> with the old MT.
> We have two MT100 and two sets of "cups."
>
> Can we somehow rig two old phone receivers to make it simulate a landline
> call over the modem c
On Sat, Dec 1, 2018 at 3:10 AM Chris Fezzler wrote:
>
> My friend and I want to show some of our kids how journalists filed stories
> with the old MT.
> We have two MT100 and two sets of "cups."
>
> Can we somehow rig two old phone receivers to make it simulate a landline
> call over the modem c
Hi!
Can you share your modified T102 image that works in the M10?
I'd like to try it too.
Frank
On Thu, Nov 29, 2018 at 2:49 AM Stephen Adolph wrote:
>
> update-
> I installed a T102 Main ROM in my M10.
> after some time figuring out the keyboard mapping, I was able to enter BASIC
> and type CALL
FWIW, I offer repair service for most 8 bit architectures and other
vintage electronic devices. However, I'm located in Italy, the second
most expensive country for shipping costs that I'm aware of.
Frank
On Sun, Oct 28, 2018 at 8:04 PM Josh Malone wrote:
>
> I'm very close to starting to offer g
be found
new at this time. I have used batoches of several other SRAMs when
I've found a good deal on ebay for example.
I do all glue logic with a single 74HC86.
>
> On Mon, May 7, 2018 at 2:45 AM, Francesco Messineo
> wrote:
>>
>> On Mon, May 7, 2018 at 9:08 AM, Dig
On Mon, May 7, 2018 at 9:08 AM, Diggy Dude wrote:
> Thanks, Fugu!
>
> So the modern solution is a single SRAM and capacitor on a SOIC-to-DIP
> breakout? What's the RAM chip they're using?
and a logic chip (there're a few different approaches here) to combine
the separate chip selects to a couple
On Wed, May 2, 2018 at 4:25 AM, Jeffrey Birt wrote:
>
> Thanks for the response concerning the 40H parts.
>
>
>
> I took some time this evening to very carefully look at all the signals on
> the 80C55. I thought I saw some odd waveforms and after setting the scope to
> single shot mode I did ind
On Sun, Apr 29, 2018 at 4:19 PM, Jeffrey Birt wrote:
> Hello,
>
>
>
> I got a Model 100 a while ago and just got it out to do some serious
> troubleshooting. After reading what I could find online I removed the NiCad
> battery (bad) and replaced C82, C85, C49-50-54-55 as they had all started to
>
just to show my email address, it seems someone mentioned my name here :)
On Wed, Apr 18, 2018 at 12:59 PM, Fugu ME100 wrote:
> Apologies. Wrong link for the DIP version, corrected version
>
> In terms of memory upgrades you will need a specific M100 RAM module. I
> believe France
On Sat, Mar 17, 2018 at 8:44 PM, Chris Kmiec wrote:
> I'm definitely down for a couple if you are adding up the requests.
ok, let's maybe take out the requests off the list? I'll make a list
and see how many modules would be and then calculate a price.
F
e I assumed you weren't particularly
> interested in building and selling these, but if you do, then by all means
> let us know what the cost would be.
>
> However, having just sent something to Italy which, as you know, hasn't even
> arrived yet, I suspect postage
On Fri, Mar 16, 2018 at 4:02 PM, Mike Stein wrote:
> - Original Message -
> From: "Francesco Messineo"
> To:
> Sent: Friday, March 16, 2018 5:19 AM
> Subject: Re: [M100] 8K RAM Chip
>
>
>
>>Well, I don't know, my 700 mils modules work w
t can be done, but you anyway need logic to reconstruct the
addresses, so why bother with diodes? I use only one logic chip for
all the work.
>
> Also, at least one of the commercial modules used diodes, so perhaps it
> depends on the RAM chip; some experimentation might be in order.
>
>
made more than 70 8K modules so far, all have been tested for < 4
>>uA current draw in standby conditions (most of the times, they end
>>under 0.1uA which is my test setup measure limit).
>>
>>
>>>
>>> On 15/3/18, 10:27 AM, "M100 on behalf of Fr
10:27 AM, "M100 on behalf of Francesco Messineo"
> francesco.messi...@gmail.com> wrote:
>
>>On Thu, Mar 15, 2018 at 6:08 PM, Mike Stein wrote:
>>> Yeah, there are a number of ways to deal with the non-standard RAM
>>>modules
>>> in an M100; the p
On Thu, Mar 15, 2018 at 6:08 PM, Mike Stein wrote:
> Yeah, there are a number of ways to deal with the non-standard RAM modules
> in an M100; the pin spacing of the modules is .75 instead of the standard
> .60, so you will probably have to make a little adapter board in any case.
>
spacing is actu
On Thu, Dec 28, 2017 at 4:41 PM, Jan Vanden Bossche wrote:
> What amps does a Model 100/102/200 need ?
I'm not sure about these, but my Olivetti M10 (roughly similar to the
M100) works fine with an old telephone charger rated at 300 mA (5V).
Frank
I don't have an original M100, however, I've made in the past some
ROMs adapters for other old computers, they are actually smaller than
the original (EP)ROM, I usually use SMD EEPROMs on a PCB board and
Batten & Allen side pins (or straight ones when I feel like spending
more time soldering them.
6402 (pin 1 of M22) ?
>
> m
>
> - Original Message -
> From: "Francesco Messineo"
> To:
> Sent: Thursday, August 03, 2017 3:49 AM
> Subject: Re: [M100] Model 100 serial port
>
>
>> On Thu, Aug 3, 2017 at 12:01 AM, Kurt McCullum wrote:
>>>
On Thu, Aug 3, 2017 at 12:01 AM, Kurt McCullum wrote:
> Testing thus far reveals that pin 25 of the UART doesn't fluctuate at all. It
> sits a 6.7 volts even when I'm not sending data. I wrote a BASIC program that
> sends a character, waits a half a second then sends another.
6.7V doesn't sound
On Wed, Aug 2, 2017 at 6:47 PM, Mike Stein wrote:
> Good advice; the most likely culprit (because it's indirectly connected to
> the outside world with its static, lightning, ground loops etc.) is M35, a
> (1)4584.
>
> The only other IC would be M24, a 40H032 (which could probably be replaced
>
unavailable).
how many parts and nets?
> Ken
>
Frank
> On 7/31/17 10:02 AM, Francesco Messineo wrote:
>>
>> Hi all,
>> just a little suggestion here. If anyone is going to redo this
>> project, why not doing it with Kicad which is free and available in
>>
Hi all,
just a little suggestion here. If anyone is going to redo this
project, why not doing it with Kicad which is free and available in
many platforms?
I'm working with kicad since years and I think it's well suited to
even large designs (I didn't check about this particular one though).
HTH
Fra
On Mon, Jul 31, 2017 at 10:07 AM, Willard Goosey wrote:
> lda load register A with pointed to by address
> ldax b load register A with value pointed to by register pair BC
> ldax d load register A with value pointed to by register pair DE
> mov a,m load register A with value pointed to by
On Tue, Jul 25, 2017 at 7:18 AM, Jim Toth wrote:
> Can an M100's backup battery read 4 volts and still be too bad to work
> right? I've seen car batteries act that way.
you have to measure it during standby. With the power off and the
standby power on, measure the battery voltage (and double che
x
residues have enough conductivity when damp to add a few uA of leakage.
Best regards
Frank IZ8DWF
> - Original Message -
> From: "Francesco Messineo"
> To:
> Sent: Thursday, July 06, 2017 3:13 AM
> Subject: Re: [M100] NEC 8201A Ram
>
>
>> Hello,
>> I
wrote:
>>> > Wow those sure look perfect. Especially that last one because it uses
>>> > easy
>>> > to source pin headers for legs.
>>>
>>> not at all. All the modules use the Batten & Allen "IC pin
>>> replacements". The
On Thu, Jul 6, 2017 at 9:25 PM, Lee Olivares wrote:
>> not at all. All the modules use the Batten & Allen "IC pin replacements"
>
> Hey I'd never seen these "pin replacements", probably not what you're
> referring to, but in a similar vein:
>
> http://www.dasarodesigns.com/product/batten-and-allen
the Olivetti M10) to use
standard pin strips, the vertical clearance isn't enough.
Frank
>
> --
> bkw
>
> On Jul 6, 2017 3:13 AM, "Francesco Messineo"
> wrote:
>>
>> Hello,
>> I'm new to this list, I've been just reading for a while.
>
Hello,
I'm new to this list, I've been just reading for a while.
On Thu, Jul 6, 2017 at 6:14 AM, Brian White wrote:
> 102 is easy. 100 is not so easy.
>
> There was a guy in Romania selling NEC branded modules dirt cheap last year
> but those are gone now. Or at least they're not on ebay any more
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