030 exxos RTC issues.

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exxos
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Re: 030 exxos RTC issues.

Post by exxos » Fri Sep 07, 2018 8:41 am

On one users machine, the RESET pin on the NVRAM is always low. On my machine when it is off, its 3.3V, when machine on, 5V. This one machine is 0V all the time. I tried hardwire my RESET pin to 0V, and made no odds to machine booting or corrupt settings. Though it does suggest the module is malfunctioning as there is no output on that pin. The only difference between the user having the machine and myself, is I used a recapped falcon PSU. He is using a Falcon PSU (not recapped). We are currently looking into reset issues, he generally says the machine seems to boot and store settings when the machine is "warm"...

The problem here is the second user has one of my exxos PSU's, has the same problem, BUT I think his metal shielding is shorting the battery out.. still waiting to hear back on that.

The machine I have here on test, plus the NVRAM modules are still working fine. Machine been on for hours, off for hours, had battery changed, settings set and checked.. I just can't find anything wrong here.
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

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Re: 030 exxos RTC issues.

Post by exxos » Thu Sep 13, 2018 9:03 am

RTC modules still working fine here. As to why they fail when the user gets hold of the things I have no idea. The guys who I sent replacement modules and a dallas RTC haven't got back to me, so that was a waste of time.

So I will put them back in stock and mention they may need debugging in some machines. There is nothing I can do "my end" as every modules tests fine and even all the machines I have fitted them to work fine.. until the user gets the stuff. I can only assume its something PSU or RESET related, but until someone can actually help debug, or send me a problem machine, there is nothing more I can do.
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/last/storenew/ - All my hardware mods for sale - Please help support by making a purchase.

guus.assmann
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Re: 030 exxos RTC issues.

Post by guus.assmann » Thu Sep 13, 2018 4:06 pm

Hello,
Some time ago, I've replaced the RTC on a number of Falcons.
With the old RTC they still worked, also after I put a socket in the board.
However, with the new RTC-chip, they wouldn't boot, the chips being new and from Mouser.

To remidy the situation, I put the old RTC back and booted the Falcon with the test-cartridge.
Then, I removed the RTC from the socket and put in the new chip. (Falcon still powered ... )
The test-cartridge can do a RTC-test. So I used that and the chip passed.
After this, the Falcon would boot as it should.

Maybe the modules will work fine after this Test-cartridge RTC-test prior to shipment.

BR/
Guus

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Re: 030 exxos RTC issues.

Post by exxos » Thu Sep 13, 2018 4:21 pm

What I do my end doesn't really matter though, I don't ship with battery, (to many rules and regulations and paperwork for lion batteries).

With new dallas chips you have to reset them with the key combo, or if lucky it boots so can use the nvram reset program and set.

So it's not a case of reset type issue with the module, which I believe you are seeing.

The problems which appearing are settings not being either written or read on power up. I found this fix before...viewtopic.php?f=10&t=37#p2479

Settings were actually being written, but not read on power up. I can only think that the Falcon reset circuit is not allowing the RTC time the reset before it tries to read contents.

But of course all the motherboards I have done but never failed while I have had them here. As soon as the users get them they seem to have nothing but trouble. But until someone is able to do some debugging or send me such motherboard to diagnose, there is nothing I can do about this problem.

I think its likely something the user is doing either blowing them up for plugging them in backwards or generally messing about with them in ways they shouldn't be or something. I really don't know.
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/last/storenew/ - All my hardware mods for sale - Please help support by making a purchase.

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Re: 030 exxos RTC issues.

Post by exxos » Sat Sep 15, 2018 9:14 am

One chap got back to me.. long story short, the socket seems bad, it wasn't the socket I sell in my store, so evil sockets strike again it seems. Thinking about it, there have been a few people buying the RTC without a socket from my store. The ones I sell are not cheap china knock-offs. Of course I've had epics of problems with sockets, so it could just be as simple as that..

So I am concluding there are no RTC issues known so far. Nothing has failed with the modules during all my testing. So has to be something "user end" which is causing issues.
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/last/storenew/ - All my hardware mods for sale - Please help support by making a purchase.

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