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

Ah well, if you need/want to replace the 4116s with 4164s anyway then it makes a little more sense...

I don't think that +12 and -5V are used anywhere else and the 4116>4164 conversion is pretty straightforward and well documented, so have fun!

m 

----- Original Message ----- 
From: "didier derny" <didier@aida.org>
To: <cbm-hackers@musoftware.de>
Sent: Wednesday, September 07, 2016 2:21 PM
Subject: Re: use of +12 and -5 on commodore 8032


> 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
>>>
>>>        Message was sent through the cbm-hackers mailing list
>>         Message was sent through the cbm-hackers mailing list
> 
> 
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