regularity of ram failure signs read....

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simbo

regularity of ram failure signs read....

Postby simbo » Fri Apr 03, 2009 5:35 pm

please post here your known !!! and fixed signs of memory failure as a one post with one picture affair
no cross posts please !!! and etc...
just leave others to post what it was and what was the outcome
so two posts per users
these pics and post can be added to a post within the wiki
maybe called common signs of memory failure
and links to what to do next....

ill add the ones from previous post that have found a cure
with other mods and make a good section here
of known totaly to be ram section

more to follow


ram seems to fail faster these days and it makes sence for members to grab 4mb 72pin fast page ram 70ns or =>

to make a stash for us atari girls and guys...



post structure notes:

1: machine / revision .. or a picture of the board in good detail preferably an off site link maybe yahoo or something

2: pictures of the output video and also the sound !!!{many people forget to add sound output detail this can be important!!!
3: voltage levels using a meter to monitor the 12v and 5v rail
many memory failings are caused by parts in the psu like the bridge rectifer leeking ac...
a known issue the first sign is ropie tv video maybe made worse by floppy reads {hum bars around the picture or a mad jaggy effect round all spirtes or screen frames etc... its worth plugging in your atari every so often to the tv to see }

there will be a better solution on its way soon for the different st machine builds to bring them to 4mb i think mounted on top of the mmu a single board and remove one pin on each ram chip thats onboard is best...



well enough post your conclussions here

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techie_alison
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Re: regularity of ram failure signs read....

Postby techie_alison » Sat Apr 04, 2009 1:10 am

These two were both RAM. And corrected with removing the banks and putting a SIMM in.
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Nikolas
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Re: regularity of ram failure signs read....

Postby Nikolas » Mon May 18, 2009 9:45 pm

Im having 60 or 70ns sims instaled in my stfm,it say 99 % of speed ad not fully 100 % ..
So i need to install 80ns (or more?)ns ram modules to gain hier speed for my stfm?
If you guys expirience hardware problems.
1. Always remove chips if possible before soldering.
2. Resolder your hardware, check cables too.
3. If problem continue THEN must be faulty software.

I got 2 Atari ST
Main is stfm, with blitter, with 4 meg of ram, with 16mhz cpu + s-video and audio input to videobox, vdi out
P.S.
My english may not be correct

simbo

Re: regularity of ram failure signs read....

Postby simbo » Tue May 19, 2009 11:17 pm

60ns is faster 70ns is fast 80ns is slowest

using 60ns is ok but can be a bit fast for an stfm best stick to 70-120ns
i would use 70ns myself

if it says 99% speed its most often someone forget to remove some resistors from the board after upgrade
or some other reason

? do you have blitter installed
give more info on tools and take a picture of the upgrade areas

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Nikolas
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Re: regularity of ram failure signs read....

Postby Nikolas » Thu May 21, 2009 5:50 am

Sorry for long reply.. Forum had problem..

Sorry, i cant take picture of my stfm, o dont like open up stuff wifh wotks perfectly.. Instead, ill provide you with pisture:

Image

i install socked put chip into socked and unsolder 2 jumpers.
I use stfm shematics to install blitter
http://atari4ever.free.fr/


My atari had 99% before blitter upgrade, and after upgrade, it is wery stable, not wery used stfm, it was used in scool in UK, then rectifer die and fuse :)
If you guys expirience hardware problems.
1. Always remove chips if possible before soldering.
2. Resolder your hardware, check cables too.
3. If problem continue THEN must be faulty software.

I got 2 Atari ST
Main is stfm, with blitter, with 4 meg of ram, with 16mhz cpu + s-video and audio input to videobox, vdi out
P.S.
My english may not be correct

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Re: regularity of ram failure signs read....

Postby Cyprian » Thu May 21, 2009 9:18 am

Nikolas/Ego wrote:Im having 60 or 70ns sims instaled in my stfm,it say 99 % of speed ad not fully 100 % ..
So i need to install 80ns (or more?)ns ram modules to gain hier speed for my stfm?

there is no difference between60 or 70ns SIMM, due to MMU in ST has 250 ns access time,
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Re: regularity of ram failure signs read....

Postby dexterslab » Thu May 21, 2009 4:21 pm

Nikolas/Ego wrote:Im having 60 or 70ns sims instaled in my stfm,it say 99 % of speed ad not fully 100 % ..
So i need to install 80ns (or more?)ns ram modules to gain hier speed for my stfm?


i would read 99% = 100%, there will always be small variances in speed between different machines even if the hardware appears to be identical. Manufacturing tolerances, temperature and age will all have a (very) small effect on the baseline clock frequency. Rounding errors in your benchmark application could also have an effect, eg 99.44% would show as 99% but 99.56 would show 100%

in summary: there's nothing wrong

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Re: regularity of ram failure signs read....

Postby Frank B » Sun May 24, 2009 7:36 pm

dexterslab wrote:
Nikolas/Ego wrote:Im having 60 or 70ns sims instaled in my stfm,it say 99 % of speed ad not fully 100 % ..
So i need to install 80ns (or more?)ns ram modules to gain hier speed for my stfm?


i would read 99% = 100%, there will always be small variances in speed between different machines even if the hardware appears to be identical. Manufacturing tolerances, temperature and age will all have a (very) small effect on the baseline clock frequency. Rounding errors in your benchmark application could also have an effect, eg 99.44% would show as 99% but 99.56 would show 100%

in summary: there's nothing wrong


Hello.
If this is quickindex or gembench providing the results try booting with nothing in your autofolder. GDOS has an overhead which affects the results when testing. If you want a reliable way to test the speed a simple raster test would work. See if you get approx 160,000 clock cycles a pal frame.

Kind regards,
Frank

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Re: regularity of ram failure signs read....

Postby Nikolas » Mon Jun 01, 2009 5:54 pm

Like you say, i load from disk a without(turned off hardisk) all is now 100%
Ty frank
If you guys expirience hardware problems.
1. Always remove chips if possible before soldering.
2. Resolder your hardware, check cables too.
3. If problem continue THEN must be faulty software.

I got 2 Atari ST
Main is stfm, with blitter, with 4 meg of ram, with 16mhz cpu + s-video and audio input to videobox, vdi out
P.S.
My english may not be correct


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