[Coco] CoCo 2 12v

dave at davebiz.com dave at davebiz.com
Mon May 10 19:15:54 EDT 2021

The CoCo 2 (and CoCo 3 for that matter) no longer supply +12v to the 
cartridge connector. However, voltages higher/lower than +5/-5 volts can 
be obtained at pins 15 & 16 of the SALT chip (U1). According to the 
manual they should be at least +7.5v and -7.5v. unregulated DC.

A video circuit may need some negative and positive voltage components 
but if it's a well-designed circuit it shouldn't need +12v as that is 
way higher than what would be required to generated a NTSC composite 
video signal.

On 5/10/2021 9:15 AM, Carlos Camacho wrote:
> I saw a schematic from Tandy the other day on Facebook for a composite
> video out. It was marked CoCo 2 and utilized 12V in the circuit. I
> thought that 12v was dropped on the CoCo 2 and was only available on
> the CoCo 1? Or am I mixing up that 12V was dropped from the CoCo 2's
> cartridge port? If there is 12V on a CoCo 2, what is the best place to
> tap into for 12v?
> Cheerio
> Carlos

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