DarkLord wrote:That is a possibility - lowest common denominator and lowest bidder is not unheard
I was off work tonight so I went ahead and changed everything. Black and white
from the power jack are connected with no breaks, and the STacy's original on/off
switch is used to control the "break" from pin#14/green wire and the ground/black
Everything seems to be working correctly. The PICO green light goes active as soon
as you plug the brick in to the power jack, and it all powers up just fine when you
turn the STacy's power switch on.
Looking good, thanks!
Poobah wrote:I'd have to check the schematics, but the lcd is going to have some power requirements beyond the normal computer... bias voltage for the LCD, inverter for driving the backlight, etc.
troed wrote:Many thanks for your guide - I looked at the pictures extensively when I just did the same mod myself. (Full description with photos during the work etc will be posted once I'm done)
Regarding the discussion whether to connect 14-GND to the Atari power switch or the actual 12V input I now regret not having done the latter. The power brick I use suffers from severe high pitch squealing when the picoPSO is connected but nothing is drawing power. As soon as I flick the switch and the ST boots up the noise goes away.
One solution is to find a power brick that doesn't, of course (it's a common problem with switching PSUs), but another would be to have pin 14 always grounded and to switch on the 12V input instead.
troed wrote:Full description with photos during the work etc will be posted once I'm done
Writeup now posted here: http://blog.troed.se/projects/atari-st- ... placement/
TheNameOfTheGame wrote:Now my question is with the atx connector from the pico. There are four 5v rails on the atx and 2 on the atari. So just connect 2 atx red wires to each of the atari mainboard inputs?
But that leave 6 gnd wires from the atx. And I only have 1 post on the atari connector. How many gnd wires should I wrap together to go to the atari? All of them?
TheNameOfTheGame wrote:Ok, couple questions. I'm doing this mod now but on an original ST.
So I took the power connector off and soldered in a stfm connector from spare parts I had.
The original ST has a two 5v, one +12v, one -12v input (which I checked with a meter and it is live) and 2 GNDs and one post in the middle is not connected NC. The stfm had two 5v, one +12v, and 3 GNDS. So the original st has 1 less GND and a -12v in comparison to the sftm.
Unfortunately the stfm connector has only 6 posts instead of seven, so that last GND hole is just bridged underneath with its neighbor. I hope that will be ok.
Now my question is with the atx connector from the pico. There are four 5v rails on the atx and 2 on the atari. So just connect 2 atx red wires to each of the atari mainboard inputs?
I am going to break the white wire from the pico connector with the atari on/off switch and just ground pin 14 green to 13 black. But that leave 6 gnd wires from the atx. And I only have 1 post on the atari connector. How many gnd wires should I wrap together to go to the atari? All of them?
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