Hi Jan, yes I knew that, but thank you!

In this days I payed a bit
with my restored M10 and I'm so happy with it :)
Since there are 4 IC in
each SRAM module and I have 2 broken modules, I was hoping to test the
single IC to find the individual broken IC and restore one module mixing
the IC of the 2 modules. 
A convoluted sentence to say that I'm trying
to restore one module out of 2.

The idea is also to build 2 more
modules with equivalent components....

Mauro

Il 10.12.2018 09:52
VANDEN BOSSCHE JAN ha scritto: 

> FYI: the M-10 uses the same modules
als the M100.
> 
> Greetings from the TyRannoSaurus
> Jan-80 """""
> @
work ( @ @ )
> --------------.ooo--(_)--ooo.---
> 
> -----Original
Message-----
> From: M100 [mailto:m100-boun...@lists.bitchin100.com
[10]] On Behalf Of Francesco Messineo
> Sent: woensdag 5 december 2018
10:58
> To: m...@bitchin100.com [11]
> Subject: 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 issue and the chain of event that caused the RAM to fail.
Litthe explanation of the repair process: Removed M3, M4 (decoders), M7,
M8, M9 (all my RAM Modules). Tested M3 and M4 with a TL866 -> good
Installed IC machined sockets. Installed M3 and M4 back in place
Installed only one RAM module in M9 position PC tested -> FAIL Replaced
RAM Module PC tested -> FAIL Replaced RAM Module with the last one
available SUCCESS!!!!!! Out of 3, I have 2 broken RAM modules :)
> 
>
I'm glad you solved the problem, I don't think the original modules
>
can be easily repaired they are made on a kind of ceramic subtrate,
>
but I might give them a try if you want.
> I'm also making replacement
modules for the M10 and compatibles since
> some years.
> You can
contact me privately of course.
> 
>> I think I don't need another M10
unless I don't want to restore/expand the RAM size. Do I have other
options? Is REX available for the M10? Thank you everyone Mauro Il
04.12.2018 12:08 mau...@tiscali.it [1] ha scritto: Sounds possible,
thank you!! For the same reason and to get used to the new desoldering
tool I'll first remove and test the 2 decoders M3 and M4 (40138). Mauro
Il 04.12.2018 09:24 Francesco Messineo ha scritto: 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 help and he suspect I damaged the
RAM. Thank you again Francesco. I bought a desoldering iron and I hope
in the next few days I'll find the time to try removing all RAM modules
and fit one at a time in the first socket (hoping one module is still
alive). I actually suggested the RAM could be damaged when he opened SW3
(the RAM backup power) with SW5 (the main power switch) closed is that
some logic and the RAM have Vb as Vdd rail and almost the rest of the
system has Vdd derived from Vp (via the dual output inverter). Now, if
you look at the schematic, SW3 removes both Vb and Vp, but, on Vb
there's only a few bypass capacitors to ground plus 1 uF electrolytic,
so it might discharge quickly, while on Vp there's at least one 470uF
capacitor plus another 470uF on the output of the inverter on Vdd side
(yes, also much more logic powering from it, but stil...). What might
happen in this case is that the Vb got quickly to 0V with still some
inputs of the chips powered from it have something like +5V applied; in
this case, the protection diodes on the input start conducting and some
of them might get shorted or degraded from this current. It happened a
few times on logic that I designed that had a backup power for CMOS RAM,
I had to make sure that all inputs to the RAM were either following
Vbackup or already switched to logic 0 before removing the backup power.
So in this situation I would examine all the logic powered directly from
Vb and that includes the RAMs. Usually a quick test with a multimeter
(with all circuits powered off) from each input pin to Vdd pin of the
chips can show if there's some damaged input protection diode. HTH Frank
IZ8DWF Sent from my iPad On 03/dic/2018, at 19:06, Jan Vanden Bossche
wrote: Mauro, What do you need to repair your M-10? Greetings from the
TyRannoSaurus Jan-80 ________________________________ From: Mauro Pintus
To: m...@bitchin100.com [5] Sent: Saturday, 1 December 2018, 16:12
Subject: Re: [M100] Olivetti M-10's for a new home Thank you Jeff,
really appreciated. Now I keep my finger crossed :) Have a nice day
Mauro On Dec 1, 2018, at 3:59 PM, Jeffrey Birt wrote: Mauro, You have a
need for them, so you should have them if the original person does not
speak up. Fixing your machine is a better use. I have no specific need,
just thought it would be neat to have a machine with AZERTY keyboard.
Jeff_Birt From: M100 On Behalf Of Mauro Pintus Sent: Saturday, December
1, 2018 7:50 AM To: m...@bitchin100.com [7] Subject: Re: [M100] Olivetti
M-10's for a new home I was soo exited I didn't see the other answer
from Jeffrey, I'm sorry... Hope we can find an agreement, I'm really
interested but I don't want bother anyone. Mauro On Con OpenStar hai
Giga, SMS e i minuti che vuoi da 4,99EUR al mese, per sempre. Cambi
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di INFINTY! http://tisca.li/myopen [8] Con OpenStar hai Giga, SMS e i
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come vuoi e in più hai 10EUR di credito omaggio e 6 mesi di INFINTY!
http://tisca.li/myopen [9]
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