I have an old 520STM (external PSU variety) with a C70243 REV.H motherboard. What are the PSU requirements for it?
As far as I can ascertain it needs +5V ~ 1.5A for main logic, and +12V at a few mA for PAL video encoder and switching between Mono & Colour.
The rest of the +12V is for the RS232 serial drivers together with the -12V.
If I only feed it +5V and +12v will it work other than the serial port or is there anything else that needs -12V?
Thanks
Peter
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Ext PSU requirements for old C70243 Rev H 520STM
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Steve
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Re: Ext PSU requirements for old C70243 Rev H 520STM
Literally the exact same question yesterday :)
https://www.exxosforum.co.uk/forum/viewt ... f=9&t=5110
https://www.exxosforum.co.uk/forum/viewt ... f=9&t=5110
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