Author Topic: c64 PC PSU adaptor  (Read 1151 times)

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Offline Gryzor

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c64 PC PSU adaptor
« on: 21:07, 08 January 14 »
Given the shitty quality of the Commodore bricks, this could come in handy to some in here...


C64 Power adaptor | Commodore Is Awesome

Offline TFM

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Re: c64 PC PSU adaptor
« Reply #1 on: 22:16, 08 January 14 »
Nice for the c64, but the link (on that page, which describes the hardware) goes to a forum of CPC haters sadly.
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Offline The Last Bandit

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Re: c64 PC PSU adaptor
« Reply #2 on: 11:12, 17 January 14 »
Interesting idea, not read the forum but wonder how the SID likes the (most likely) noisy switch mode generated AC ?

Online Bryce

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Re: c64 PC PSU adaptor
« Reply #3 on: 12:57, 17 January 14 »
The SID didn't actually use the 9VAC directly. It was half regulated to supply a 12V (almost) DC supply. The signal this device produces would be fine for that too.

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Offline The Last Bandit

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Re: c64 PC PSU adaptor
« Reply #4 on: 14:00, 17 January 14 »
Ah I though the SID used the analog supply internally for its audio magic. Don't know much about Commodores really, only bought my first C64 recently  ;D 




Online Bryce

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Re: c64 PC PSU adaptor
« Reply #5 on: 15:13, 17 January 14 »
No, it never gets used as AC inside the machine. It goes directly to a bridge rectifier which creates an unregulated 9V DC which supplies pin C3 of the tape port and the 9VAC is also connected directly to the User port (pins 10 and 11), presumably to be used for stepping up to higher voltages on expansions. Internally, after the bridge rectifier it also goes to a simple (single Zener Diode / transistor / capacitor ) regulator to feed the SID with 12V (or 9V depending on the SID installed).

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« Last Edit: 15:15, 17 January 14 by Bryce »

Offline endangermice

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Re: c64 PC PSU adaptor
« Reply #6 on: 19:44, 21 January 14 »
From memory, the 9V AC is used for the TOD clock in CIA 2. It uses the AC frequency as a timing reference. As Bryce says, the 6581 SID runs from 12V DC in the original C64. The 8580 SID in the revised C64C uses 9V DC instead.
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Offline 00WReX

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Re: c64 PC PSU adaptor
« Reply #7 on: 21:54, 21 January 14 »
Yeh, the 6567 / 6569 VIC (VIDEO) chip also requires both 5v & 12v.

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Re: c64 PC PSU adaptor
« Reply #8 on: 10:33, 28 January 14 »
From memory, the 9V AC is used for the TOD clock in CIA 2. It uses the AC frequency as a timing reference. As Bryce says, the 6581 SID runs from 12V DC in the original C64. The 8580 SID in the revised C64C uses 9V DC instead.

Oh yeah, forgot about the TOD clock, it needs the 9VAC too, but the signal this new PSU would supply would be fine for that too. Probably more accurate than the original in fact.

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