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

From: didier derny <didier_at_aida.org>
Date: Wed, 7 Sep 2016 20:21:49 +0200
Message-ID: <414565a0-7c6d-af64-cd83-08d53c3d699a@aida.org>
in fact no, just the regulator removed and +5v injected directly from a 
5v regulated power supply...

then need to socket the 4116  but several looks bad (a lot of oxydes)



On 07/09/2016 18:06, Mike Stein wrote:
> Sounds OK but seems like a lot of trouble and mods; why?
>
> m
>
> ----- Original Message -----
> From: "Didier Derny" <didier@aida.org>
> To: <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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>         Message was sent through the cbm-hackers mailing list


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Received on 2016-09-07 19:00:20

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