12V needed anymore ?

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exxos
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12V needed anymore ?

Post by exxos » Fri Aug 10, 2018 6:11 pm

I think the only thing which uses 12V is on the monitor port now.. Of course no need for 12V for floppy drive anymore..

So really just thinking ahead that a 5V only PSU could probably be used ultimately.. ?
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
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SolderGirl
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Re: 12V needed anymore ?

Post by SolderGirl » Fri Aug 10, 2018 6:18 pm

Does anything actually use the -12V in the ST ?

I searched for a 12V point in my ST for a while, and the only one i found was on the monitor port,
i connected a cooling fan to it.

troed
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Re: 12V needed anymore ?

Post by troed » Fri Aug 10, 2018 6:29 pm

SolderGirl wrote:
Fri Aug 10, 2018 6:18 pm
Does anything actually use the -12V in the ST ?

I searched for a 12V point in my ST for a while, and the only one i found was on the monitor port,
i connected a cooling fan to it.
Serial port, right?

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exxos
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Re: 12V needed anymore ?

Post by exxos » Fri Aug 10, 2018 6:33 pm

troed wrote:
Fri Aug 10, 2018 6:29 pm
SolderGirl wrote:
Fri Aug 10, 2018 6:18 pm
Does anything actually use the -12V in the ST ?

I searched for a 12V point in my ST for a while, and the only one i found was on the monitor port,
i connected a cooling fan to it.
Serial port, right?
Yes and no..

viewtopic.php?f=19&t=15

RS232 would normally need -12 (generated on the motherboard) and 12V from the PSU...

RS232 circuit was re-designed and only needs a single 5V supply now... It saved a huge lot of parts on the board in doing that...

EDIT: Quick look at the old -12V gen also seems to generate the +12 as well...
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/last/storenew/ - All my hardware mods for sale - Please help support by making a purchase.

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