Re: [M100] Possible M100 prototype.

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 >

Re: [M100] Possible BBS launch

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

Re: [M100] Tandy Model 100/102 modem pickup line

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

Re: [M100] Our experiences repairing a faulty RS-232 circuit in a NEC PC-8201a

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

Re: [M100] Our experiences repairing a faulty RS-232 circuit in a NEC PC-8201a

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

Re: [M100] C64 restoration and fresh mobos

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

Re: [M100] JLCPCB

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

Re: [M100] Installing 8K modules in M100

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

Re: [M100] Installing 8K modules in M100

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 - > From: "F

Re: [M100] Installing 8K modules in M100

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

Re: [M100] Olivetti M-10's for a new home

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

Re: [M100] Olivetti M-10's for a new home

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

Re: [M100] Connecting two MT with cups

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

Re: [M100] Connecting two MT with cups

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

Re: [M100] Olivetti M10 and REX

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

Re: [M100] repair services

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

Re: [M100] 8K RAM module

s the only part that can 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 > <francesco.messi...@gmail.com> wrote: >

Re: [M100] 8K RAM module

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

Re: [M100] SPAM-LOW: Re: New member - question on 'half' alive Model 100

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 >

Re: [M100] New member - question on 'half' alive Model 100

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

Re: [M100] Rex

RAM module. I > believe Francesco Messineo, who is also on this group, builds and sells > modules for the M100. I could not find his email contact address at the > moment. > > If you feel like building your own I have two different styles of an M100 > memory module PCB on OSH Park that

Re: [M100] 8K RAM Chip

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

Re: [M100] 8K RAM Chip

an issue). > > m > > - Original Message - > From: "Francesco Messineo" <francesco.messi...@gmail.com> > To: <m...@bitchin100.com> > Sent: Saturday, March 17, 2018 5:36 AM > Subject: Re: [M100] 8K RAM Chip > > >> Hi Mike, >> >> On

Re: [M100] 8K RAM Chip

On Fri, Mar 16, 2018 at 4:02 PM, Mike Stein <mhs.st...@gmail.com> wrote: > - Original Message - > From: "Francesco Messineo" <francesco.messi...@gmail.com> > To: <m...@bitchin100.com> > Sent: Friday, March 16, 2018 5:19 AM > Subject: Re: [M100]

Re: [M100] 8K RAM Chip

n 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 ord

Re: [M100] 8K RAM Chip

t; On 15/3/18, 12:23 PM, "M100 on behalf of Francesco Messineo" > <m100-boun...@lists.bitchin100.com on behalf of > francesco.messi...@gmail.com> wrote: > >>On Thu, Mar 15, 2018 at 8:13 PM, Fugu ME100 <b4me...@hotmail.com> wrote: >>> Hi Frank >>

Re: [M100] 8K RAM Chip

gt; On 15/3/18, 10:27 AM, "M100 on behalf of Francesco Messineo" > <m100-boun...@lists.bitchin100.com on behalf of > francesco.messi...@gmail.com> wrote: > >>On Thu, Mar 15, 2018 at 6:08 PM, Mike Stein <mhs.st...@gmail.com> wrote: >>> Yeah, t

Re: [M100] 8K RAM Chip

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

Re: [M100] Figtronix Main ROM adapter

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.

Re: [M100] Model 100 serial port

of the 6402 (pin 1 of M22) ? > > m > > - Original Message ----- > From: "Francesco Messineo" <francesco.messi...@gmail.com> > To: <m...@bitchin100.com> > Sent: Thursday, August 03, 2017 3:49 AM > Subject: Re: [M100] Model 100 serial port > > &g

Re: [M100] Model 100 serial port

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

Re: [M100] Model 100 serial port

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

Re: [M100] Model T upgrades

bsolete / 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 &g

Re: [M100] the 8080...

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

Re: [M100] backup battery question

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

Re: [M100] NEC 8201A Ram

because some flux residues have enough conductivity when damp to add a few uA of leakage. Best regards Frank IZ8DWF > - Original Message ----- > From: "Francesco Messineo" <francesco.messi...@gmail.com> > To: <m...@bitchin100.com> > Sent: Thursday, July 06, 2017 3:13

Re: [M100] NEC 8201A Ram

-pcb-edge-clip-pins/ >> >> Overall definitely a better idea than socketing full strip headers, which >> I was never exceedingly happy about. >> >> On Thu, Jul 6, 2017 at 1:47 AM, Francesco Messineo >> <francesco.messi...@gmail.com> wrote: >>> >>&g

Re: [M100] NEC 8201A Ram

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: > >

Re: [M100] NEC 8201A Ram

There's no room (at least into 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" <francesco.messi...@gmail.com> > wrote: >> >> Hello, >> I'm new to this

Re: [M100] NEC 8201A Ram

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