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

if I place clean socket under the ram, I'll be able to revert one day

without doing anything irreversible...


actally I'm struggly with the video  composite

with these schematics 
http://www.6502.org/users/andre/hwinfo/crtc/comp_pucoe_v1.0c-sch.png

I see the signal on the video connector....

I may have to tweak the rom first even though I'm using a 50h editor
I thought I would get a bad image without the tweaking...




On 07/09/2016 21:37, Mike Stein wrote:
> 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
>>
>>        Message was sent through the cbm-hackers mailing list
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