Re: use of +12 and -5 on commodore 8032

I think this is a good idea too. A modern efficient power supply and voltage regulator would not hurt at all. I suspect that tighter regulation and less heat would improve service life on almost every other component.

Justin

On Sep 7, 2016, at 12:09, Mike Stein <mhs.stein@gmail.com <mailto:mhs.stein@gmail.com> > wrote:

Sounds OK but seems like a lot of trouble and mods; why?

m

----- Original Message ----- 
From: "Didier Derny" <didier@aida.org <mailto:didier@aida.org> >
To: <cbm-hackers@musoftware.de <mailto:cbm-hackers@musoftware.de> >
Sent: Wednesday, September 07, 2016 7:29 AM
Subject: use of +12 and -5 on commodore 8032


> Hi
> 
> any idea if  +12v and -5v are used for anything else than  the 4116 ?
> 
> the idea:
> all original  regulator removed (easy to put back in place)   (+5 +12 -5 
> disconnected from the original power supply)
> +5v regulated directly injected on the motherboard
> +12V connected to +5v regulated  (strap between the 2 regulator output )
> 4164 installed in place of 4116
> 
> the 4164 would get 5v by the 12v track (now 5v with the modification)
> pin 1  -5v  not connected (-5v removed)
> pin 8  +5v (+5v coming by 12v track)
> pin 9  A7  (forced to 5v by 5v track)
> 
> seems similar on some modification made on atari
> 
> may any potential side effect on some other part of the system...
> I dont see any real use of the +12v and -5v except for the 4116
> but I might have missed something
> 
> for the +9v unregulated I never found any used except for the tape
> but I'll probably never use a commodore tape...
> 
> the main idea is to avoid any permanent modification on the board...
> --
> didier
> 
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