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

@soigeneris.com<mailto:bir...@soigeneris.com>> Reply-To: <m...@bitchin100.com<mailto:m...@bitchin100.com>> Date: Sunday, May 13, 2018 at 6:52 PM To: <m...@bitchin100.com<mailto:m...@bitchin100.com>> Subject: Re: [M100] SPAM-LOW: Re: New member - question on 'half' alive M

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

e a super-cap size that will at least match the original > NiCad battery. > > > > Thanks again everyone (especially Fugu) for your help. > > > > Jeff > > > > > > From: M100 <m100-boun...@lists.bitchin100.com> On Behalf Of Fugu ME100 > Sent: Thursday,

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

oun...@lists.bitchin100.com> On Behalf Of Fugu ME100 Sent: Thursday, May 10, 2018 10:06 AM To: m...@bitchin100.com Subject: Re: [M100] SPAM-LOW: Re: New member - question on 'half' alive Model 100 The address could be stuck internally on the RAM so the address line would appear OK exte

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

com>> Reply-To: <m...@bitchin100.com<mailto:m...@bitchin100.com>> Date: Thursday, May 10, 2018 at 7:13 AM To: <m...@bitchin100.com<mailto:m...@bitchin100.com>> Subject: Re: [M100] SPAM-LOW: Re: New member - question on 'half' alive Model 100 Very good observation. I beli

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

:25 AM To: m...@bitchin100.com Subject: Re: [M100] SPAM-LOW: Re: New member - question on 'half' alive Model 100 If A4 is stuck at 0 (or 1) then the SP and copy location would overlap, eg F5F0H would become F5E0H and overwrite the stack area - at least 6 bytes of it. The RAM modules are m

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

If A4 is stuck at 0 (or 1) then the SP and copy location would overlap, eg F5F0H would become F5E0H and overwrite the stack area - at least 6 bytes of it. The RAM modules are made up of 4 ICs so it it possible that only the top most RAM has a fault the others could be fine. If the RAM

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

AM-LOW: Re: New member - question on 'half' alive Model 100 I would move on to swapping RAM and decoder chips. As I said before, the decoder chip in my 102 failed last year some time; kept one of the RAM chips from ever being enabled. On Thu, May 10, 2018, 12:43 AM Fugu ME100 <b4me...@ho

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

ubject: Re: [M100] SPAM-LOW: Re: New member - question on 'half' alive Model 100 Does it only execute the loop once and get stuck for the first time at 2574H? The 49H in the data dump is most likely the C9H for the RET. The next two byte are the return address from the stack. They

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

I would move on to swapping RAM and decoder chips. As I said before, the decoder chip in my 102 failed last year some time; kept one of the RAM chips from ever being enabled. On Thu, May 10, 2018, 12:43 AM Fugu ME100 wrote: > Does it only execute the loop once and get stuck

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

Does it only execute the loop once and get stuck for the first time at 2574H? The 49H in the data dump is most likely the C9H for the RET. The next two byte are the return address from the stack. They could be 0A57H, 0AD7H, 8A57, 8AD7H or other permutations. As this routine is writing to

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

I did do a capture of the data bus while holding CTRL-BRK. It does force it to go to the cold boot routine and it goes to 7DF5H as shown below: ; == ; Cold boot routine ; == 7DE7H (31H)

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

n...@lists.bitchin100.com> On Behalf Of Fugu ME100 Sent: Sunday, May 6, 2018 9:51 PM To: m...@bitchin100.com Subject: Re: [M100] SPAM-LOW: Re: New member - question on 'half' alive Model 100 Yes quite possible a bad 81C55, M15 or keyboard would cause an issue. Try putting in one of the R

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

To: m...@bitchin100.com Subject: Re: [M100] SPAM-LOW: Re: New member - question on 'half' alive Model 100 Jeff - You might try contacting Saleae directly. They're pretty responsive, the times I've had questions...

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

Jeff - You might try contacting Saleae directly. They're pretty responsive, the times I've had questions...

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

I've never imported captures - only created them on my Rigol. Well, best of luck! On Mon, May 7, 2018 at 9:45 AM, Jeffrey Birt wrote: > I downloaded it sigrok/pulseview and exported my already captured data in > both vcd and csv and with vcd it starts importing and

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

From: M100 <m100-boun...@lists.bitchin100.com> On Behalf Of Josh Malone Sent: Monday, May 7, 2018 5:34 AM To: m...@bitchin100.com Subject: Re: [M100] SPAM-LOW: Re: New member - question on 'half' alive Model 100 The open source sigrok software supports the Saleae device. On Sun, May 6

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

The open source sigrok software supports the Saleae device. On Sun, May 6, 2018, 10:45 PM Jeffrey Birt wrote: > > The silly LA software will only do parallel decoding based on the edge and > it wont work properly with the /RD* signal alone as the clk source. The LA >

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

Yes quite possible a bad 81C55, M15 or keyboard would cause an issue. Try putting in one of the RAM modules see if that helps. Unfortunately the 81C55 also controls the LCD. I should try and see if it is actually reading the ctrl-brk, what if there is a problem with the keyboard or key

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

lto:m...@bitchin100.com> Subject: Re: [M100] SPAM-LOW: Re: New member - question on 'half' alive Model 100 The NiCad only powers the RAM when there is no other power source available. When you have AA's installed or a power adapter plugged in then that is what is powering the memory, e

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

. From: M100 <m100-boun...@lists.bitchin100.com> on behalf of Jeffrey Birt <bir...@soigeneris.com> Sent: Monday, May 7, 2018 03:12 To: m...@bitchin100.com Subject: Re: [M100] SPAM-LOW: Re: New member - question on 'half' alive Model 100 The NiCad only powers

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

[M100] SPAM-LOW: Re: New member - question on 'half' alive Model 100 Agreed the lack of NiCd might be having more impact than expected on a machine that expects data to be retained in RAM during power off. From: M100 <m100-boun...@lists.bitchin100.com <mailto:m100-boun...@lists.bi

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

00.com Subject: Re: [M100] SPAM-LOW: Re: New member - question on 'half' alive Model 100 It is the rising edge of RD that is used to latch the data into the 8085. The ROM has from the falling edge to rising edge to deliver the data. The decoder is level sensitive not edge, so the rising edge will no

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

o...@pobox.com<mailto:jho...@pobox.com>> Reply-To: <m...@bitchin100.com<mailto:m...@bitchin100.com>> Date: Sunday, May 6, 2018 at 5:49 PM To: <m...@bitchin100.com<mailto:m...@bitchin100.com>> Subject: Re: [M100] SPAM-LOW: Re: New member - question on 'half' ali

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

It is the rising edge of RD that is used to latch the data into the 8085. The ROM has from the falling edge to rising edge to deliver the data. The decoder is level sensitive not edge, so the rising edge will not only disable the ROM but also latch in the ROM data. That looks like it is

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

Now that you're applying a voltage in place of the removed NiCd have you attempted a cold start? -- John.

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

t; > > > Thanks again for your help! > > > > Jeff > > > > From: M100 <m100-boun...@lists.bitchin100.com> On Behalf Of Fugu ME100 > Sent: Sunday, May 6, 2018 2:11 AM > To: m...@bitchin100.com > Subject: Re: [M100] SPAM-LOW: Re: New member - question on

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

causes a problem. Thanks again for your help! Jeff From: M100 <m100-boun...@lists.bitchin100.com> On Behalf Of Fugu ME100 Sent: Sunday, May 6, 2018 2:11 AM To: m...@bitchin100.com Subject: Re: [M100] SPAM-LOW: Re: New member - question on 'half' alive Model 100 I would say your CPU

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

at 4:02 PM To: <m...@bitchin100.com<mailto:m...@bitchin100.com>> Subject: Re: [M100] SPAM-LOW: Re: New member - question on 'half' alive Model 100 Well, I know more…but I’m not sure what I know. I was able to capture the data bus (well the first 7 bits, used my 8th channel on

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

. I welcome any thoughts. Thanks, Jeff From: M100 <m100-boun...@lists.bitchin100.com> On Behalf Of Fugu ME100 Sent: Friday, May 4, 2018 9:39 AM To: m...@bitchin100.com Subject: Re: [M100] SPAM-LOW: Re: New member - question on 'half' alive Model 100 If the 80C85 is seeing 00

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

lto:m...@bitchin100.com>> Date: Friday, May 4, 2018 at 7:20 AM To: <m...@bitchin100.com<mailto:m...@bitchin100.com>> Subject: Re: [M100] SPAM-LOW: Re: New member - question on 'half' alive Model 100

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

Answering in line below. Thanks for your help. Jeff From: M100 <m100-boun...@lists.bitchin100.com> On Behalf Of Fugu ME100 Sent: Friday, May 4, 2018 8:38 AM To: m...@bitchin100.com Subject: Re: [M100] SPAM-LOW: Re: New member - question on 'half' alive Model 100 >>Are

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

4, 2018 at 5:21 AM To: <m...@bitchin100.com<mailto:m...@bitchin100.com>> Subject: Re: [M100] SPAM-LOW: Re: New member - question on 'half' alive Model 100 I did find some time last evening to investigate my sick M100 further. All A/D signals seem to be propagating through the buff

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

com> On Behalf Of Fugu ME100 Sent: Thursday, May 3, 2018 10:29 AM To: m...@bitchin100.com Subject: Re: [M100] SPAM-LOW: Re: New member - question on 'half' alive Model 100 Have you been able to replace the NiCd? Another thought would be to check the ROM socket is really making c

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

I'd say totally on-topic, but probably worthy of a fresh thread :) I'm all for test harnesses. If I can help with dev/test/etc lemme know! -Josh On Thu, May 3, 2018 at 11:54 AM, Fugu ME100 wrote: > A little bit off topic here…. With quite a few people trying to resurrect

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

...@bitchin100.com<mailto:m...@bitchin100.com>> Date: Thursday, May 3, 2018 at 7:17 AM To: <m...@bitchin100.com<mailto:m...@bitchin100.com>> Subject: Re: [M100] SPAM-LOW: Re: New member - question on 'half' alive Model 100 Thanks for the info about the ‘oddness’ to both you

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

rsday, May 3, 2018 at 7:17 AM To: <m...@bitchin100.com<mailto:m...@bitchin100.com>> Subject: Re: [M100] SPAM-LOW: Re: New member - question on 'half' alive Model 100 Thanks for the info about the ‘oddness’ to both you and another poster I now have some more insight into what I am looking at

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

@bitchin100.com>> Subject: 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

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] 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

:46 PM To: m...@bitchin100.com Subject: 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, 2

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

*Fugu ME100 > *Sent:* Tuesday, May 1, 2018 9:26 AM > *To:* m...@bitchin100.com > *Subject:* 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 o

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

ME100 Sent: Tuesday, May 1, 2018 9:26 AM To: m...@bitchin100.com Subject: 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 no

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

f of Jeffrey Birt <bir...@soigeneris.com<mailto:bir...@soigeneris.com>> Reply-To: <m...@bitchin100.com<mailto:m...@bitchin100.com>> Date: Tuesday, May 1, 2018 at 2:57 PM To: <m...@bitchin100.com<mailto:m...@bitchin100.com>> Subject: Re: [M100] SPAM-LOW: Re: New memb

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

of the buffer as well. Thanks again, Jeff From: M100 <m100-boun...@lists.bitchin100.com> On Behalf Of Fugu ME100 Sent: Tuesday, May 1, 2018 5:16 AM To: m...@bitchin100.com Subject: Re: [M100] SPAM-LOW: Re: New member - question on 'half' alive Model 100 On boot up one of the first

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

lto:m...@bitchin100.com>> Date: Tuesday, May 1, 2018 at 1:10 AM To: <m...@bitchin100.com<mailto:m...@bitchin100.com>> Subject: Re: [M100] SPAM-LOW: Re: New member - question on 'half' alive Model 100 While I agree the ROM is not a usual failure point they can fail. I may just

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

estion on 'half' alive Model 100 There will be minor differences, e.g. Y2K, the copyright message etc. m - Original Message - From: "Jeffrey Birt" <bir...@soigeneris.com> To: <m...@bitchin100.com> Sent: Monday, April 30, 2018 3:57 PM Subject: Re: [M100] SPAM-LOW: Re: Ne

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

com> On Behalf Of Brian White Sent: Monday, April 30, 2018 5:49 PM To: m...@bitchin100.com Subject: Re: [M100] SPAM-LOW: Re: New member - question on 'half' alive Model 100 Also remember, the pinout is not 27C256. So you'll need to use two dip28 sockets (or at least one) and 28 wires to re

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

Also remember, the pinout is not 27C256. So you'll need to use two dip28 sockets (or at least one) and 28 wires to relocate some of the pins to read the rom in a reader. http://bitchin100.com/wiki/index.php?title=Model_100_ROM On Mon, Apr 30, 2018 at 6:06 PM, John R. Hogerhuis

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

Seems like the mask rom would be the least likely thing to fail, but I suppose it's possible. Keep in mind it's not an EEPROM that can get erased though. -- John.

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

There will be minor differences, e.g. Y2K, the copyright message etc. m - Original Message - From: "Jeffrey Birt" <bir...@soigeneris.com> To: <m...@bitchin100.com> Sent: Monday, April 30, 2018 3:57 PM Subject: Re: [M100] SPAM-LOW: Re: New member - question on '

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

] SPAM-LOW: Re: New member - question on 'half' alive Model 100 You could also try contact cleaner on the ROM socket, it could of oxidized over the years.

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

: m100@lists.bitchin100.com Subject: Re: [M100] SPAM-LOW: Re: New member - question on 'half' alive Model 100 Hi Jeff. On Sun, 29 Apr 2018 16:11:08 -0500, Jeffrey Birt wrote: > I replaced C90 and have the same symptoms. I'll now dig out my eprom > programmer and read in the main ROM.

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

To: <m...@bitchin100.com<mailto:m...@bitchin100.com>> Date: Sunday, April 29, 2018 at 10:11 PM To: <m...@bitchin100.com<mailto:m...@bitchin100.com>> Subject: Re: [M100] SPAM-LOW: Re: New member - question on 'half' alive Model 100 I replaced C90 and have the same symptoms

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

On Mon, 30 Apr 2018 09:05:18 +0930, Daryl Tester wrote: Oh, it's April 30th. I made myself sad. :-( A moment to reflect that Rick is still missed ... -- Regards, Daryl Tester Handcrafted Computers Pty. Ltd.

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

4. You could also check the Electrolytic Cap on the reset line it may of leaked too which could impact the reset timing. C90 is the only electrolytic that seems to be part of the reset circuitry. I have not changed it and it is of the same manufacture as the other ones that

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

Answered in line below, thanks for your replay. - Jeff Ju>>st a couple of quick things: 1. Have you tried a cold boot to clear out any bad data in the memory? Just tried, not change. 2. Is the LCD contrast adjustment working? Yes 3. If