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 user, AA battery leakage

On Tue, May 1, 2018, at 9:06 PM, David Laffineuse wrote: > I have a spare original battery cover if interested. Thank you very much for your very kind offer. That would be awesome. And thank you everyone for your responses to this thread. As a new member, this list feels like a very welcoming

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

It's not clear from that page but the AD0-AD15 pics are from the 80C55 itself, and the logic analyser shots are from the ribbon cable to the lcd. I have one m100 that doesn't run that I was poking at several weeks ago. It seems to be in the lcd board. IE, the lcd board atually prevents the rest of

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

I see those same funny ramps and someone here said it was normal. I see them on both working and non-working M100's https://photos.app.goo.gl/vcTg4yUhvjXKBxeh1

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

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 indeed see some oddness on AD0 through AD7. Take a look:

Re: [M100] mComm 1.80 for Android

I'll look at it tonight and see if a tweak needs to be made. Kurt On Tue, May 1, 2018, at 5:54 PM, Josh Malone wrote: >> Please let me know if you run into any problems. > > Hi Kurt. I'm trying to load dos onto a 102 now and I can't actually > tap the "load dos" button. Is there a trick to

Re: [M100] New user, AA battery leakage

I have a spare original battery cover if interested. Sent from my iPhone > On Apr 29, 2018, at 1:48 PM, Simon Bates wrote: > > That would be awesome. Thank you. > > I don't have a 3d printer. > > Simon > > >> On Sat, Apr 28, 2018, at 4:20 PM, Gregory McGill wrote:

Re: [M100] mComm 1.80 for Android

> Please let me know if you run into any problems. Hi Kurt. I'm trying to load dos onto a 102 now and I can't actually tap the "load dos" button. Is there a trick to injecting dos100 in this version? -Josh

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

I replaced my 40H decoder with a 7x part and have had no issues. The address decoder circuit failed in my 102 and it turned out to be the demultiplexer / decoder. On Tue, May 1, 2018, 4:57 PM Jeffrey Birt wrote: > Possible silly question…I have been able to find no data

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

Possible silly question.I have been able to find no data on the 40H244, 40H245, 40H373 part numbers. Given their function and pinout I'm guessing that a 74HC part would be an acceptable substitute? Thanks again, Jeff From: M100 On Behalf Of Fugu ME100

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

If checking the buffers etc you should see the I0/M line toggle quite quickly after power on and of course the ALE line. If it does not then it is not even starting a proper boot, I feel your processor is OK they are quite robust and well protected by all the buffers. I think you mentioned a

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

Thanks that was very helpful. I'll double check the A/D lines and all other pins on the 80C85 but as I recall they were all toggling nicely in the 0-5V range. I'm having to relearn how 8080'ish systems work. It is one of the first processors I learned on (well Z80 on a TS 1000) and then I got into

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

On boot up one of the first things the M100 does is to configure the PIO (81C55) in order to scan the keyboard for the ctrl-break.The PIO and LCD all use port addresses, there should be a lot of activity on the IO/M pin on a normal boot! Indeed within about 10 instructions, for a normal