Questions tagged [power]

Questions and problems related to powering retro equipment.

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28
votes
7answers
12k views

Why did computers use a power supply with a socket?

Most home electrical appliances use a fixed power cord and have a on/off switch near the front. I was in many government electronics labs and that cord and socket was not used i.e HP test equipment. ...
16
votes
2answers
6k views

How and why did the ZX Spectrum use so many voltages?

Whilst researching the Zilog Z80, I had found that it accepts a 5V power supply.[2] When looking for information on the ZX Spectrum, I found that its power adaptor produces 9V.[1] Confused, I did some ...
22
votes
5answers
5k views

How can I power a C64?

I was chatting with our neighbor and after some long talking, I found out that he has a Commodore 64. I'd love to test it, however I'm not sure how to power it. How can I power a C64?
13
votes
1answer
2k views

Can polarity inversion damage a ZX Spectrum?

I have a ZX Spectrum+ and it didn't came with it original power supply. I bought a 9 Volts and 2.25 Amps power supply with switchable connectors. There was a mistake and the polarity was inverted, ...
9
votes
2answers
546 views

What's the best way to hook up an external power supply to the Apple IIc without a 7-pin female DIN plug?

As seems to be typical with Apple IIc purchases these days, mine came without the external power supply. I have ordered some 7-pin female DIN plugs and other adapters that will let me plug a modern ...
12
votes
1answer
1k views

What is the proper way to test the PSU output for a Commodore 128D?

This question is directly related to comments on the more general question and answer here. The Commodore 128D and 128D-CR have an internal PSU that can be readily and safely disconnected from the ...