Well, it will make it lighter and easier to move around... ;-) But it seems like a lot of needless work and modifications to the board, especially unsoldering and replacing the memory chips, not to mention disabling the cassette drives; I don't recall ever seeing or hearing about any issues that could be traced to a power supply problem other than the inadequate connector. As I mentioned before, with all the boost and buck converters these days you could presumably provide all the necessary voltages from a single 12V or 5V switching supply and not touch the PET board at all, or just modify a standard PC supply to raise the voltages as required. But a chacun son gout... m ----- Original Message ----- From: Justin Cordesman To: email@example.com Sent: Wednesday, September 07, 2016 1:32 PM Subject: 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 <firstname.lastname@example.org> wrote: Sounds OK but seems like a lot of trouble and mods; why? m ----- Original Message ----- From: "Didier Derny" <email@example.com> To: <firstname.lastname@example.org> 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 listReceived on 2016-09-07 19:00:02
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