I completed the work today on my Stacy 4144. Removed the J17 header and soldered in wires to
2 +5
4 +12
5 -12
10 gnd
Ran these to a nano PSU with an adapter board that allows me yo turn the PSU on and off
When I power the Stacy I get a white screen and no floppy activity
Please note-I don’t know for certain that my monitors and the monitor to DB9 adapter are working properly but I am going by floppy activity and nothing happens when I power on the Stacy.
Since I don’t have the LCD monitor hooked up due to the psu swap hard to know if I’m getting an actual boot up.
First question.
I have seen people state they have powered the Stacy via the floppy connector. Correct me if I’m wrong but the floppy connector only has 5 and gnd. The 12v looks unconnected in the schematic.
Can someone confirm that this approach works, just 5 and gnd via floppy?
Secondly, I connected the nano pico psu to the j17 pins above.
Pins 1-3 all tie to +5 and I ran the wire to 1. 9-11 are grounds and I ran the ground from the psu to 10.
Do I need to run the power to all 3 inputs and ground to all 3 grounds?
Stacy nano psu upgrade
Stacy nano psu upgrade
Atari Stacy 4 w/T25 Accelerator. External Ultrasatan. Working on Stacy color monitor upgrade via RGB2HDMI.
Atari Mega STE 4/350. SCSI disconnected. External Ultrasatan.
Atari 600XL (in the progress of upgrading with U1MB, Sophia 2, etc.)
Atari 130XE with CSS Ultra Speed Plus OS 320kb
ATR8000 and a bunch of other Atari goodies
Atari Mega STE 4/350. SCSI disconnected. External Ultrasatan.
Atari 600XL (in the progress of upgrading with U1MB, Sophia 2, etc.)
Atari 130XE with CSS Ultra Speed Plus OS 320kb
ATR8000 and a bunch of other Atari goodies
Re: Stacy nano psu upgrade
I used a Pico for a while, hooked up to the 2nd set of floppy leads on my STacy
and it worked fine. +5 and ground were all that were needed, IIRC. I got this
information from Alan H. at Atari Forum. When I say "fine", I mean I was using
it to drive a color monitor from the external video port on my STacy, not the
original LCD.
There are 2 sets of floppy leads because there actually was a STacy model
with 2 internal floppies instead of 1.
About powering the original LCD. I tried that with the Pico and failed. All I
got was a black screen. I wasn't intelligent enough to figure out how to get
the Pico to do the negative -20 (or was it -12?) that's in that circuit. Really
weird stuff there, IMHO.
HTHs.
and it worked fine. +5 and ground were all that were needed, IIRC. I got this
information from Alan H. at Atari Forum. When I say "fine", I mean I was using
it to drive a color monitor from the external video port on my STacy, not the
original LCD.
There are 2 sets of floppy leads because there actually was a STacy model
with 2 internal floppies instead of 1.
About powering the original LCD. I tried that with the Pico and failed. All I
got was a black screen. I wasn't intelligent enough to figure out how to get
the Pico to do the negative -20 (or was it -12?) that's in that circuit. Really
weird stuff there, IMHO.
HTHs.
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Re: Stacy nano psu upgrade
Correct that +12V on the FD connectors is not connected to anything. But you don't need it. I can confirm, as @Darklord has, that the Stacy can run fine (with external monitor) when powered solely with +5V via the FD connector.Gitbizy wrote: ↑Fri Sep 03, 2021 11:49 pm I have seen people state they have powered the Stacy via the floppy connector. Correct me if I’m wrong but the floppy connector only has 5 and gnd. The 12v looks unconnected in the schematic.
Can someone confirm that this approach works, just 5 and gnd via floppy?
By "all three inputs", do you mean all three of the +5V pins or all three of +5V, +12V, and -12V? All the +5V pins are tied together, so you don't technically need to power all of them, as long as your PSU can provide enough current over just one. Just the same, I did connect all three when I did my own picoPSU connection. The pico has the pins available, so why not use them?Do I need to run the power to all 3 inputs and ground to all 3 grounds?
If you were referring to the three separate voltages, then no, you really only need the +5V to get the Stacy running (with external monitor). I don't know if the +12V is used for anything other than the +12V line on the monitor out, and I don't know if -12V is used for anything at all. Just the same, I hooked it up.
Do note that if you're using something like an ubeswitch or exxos's VGA adapter on the monitor output, those boards do need the +12V on that port.
Re: Stacy nano psu upgrade
I think your real difficulty there would be the 85V AC @ 590Hz that the EL backlight needs. Good luck!
Re: Stacy nano psu upgrade
Yeah, as I mentioned, never got that part to work... Oh well...
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Re: Stacy nano psu upgrade
Good news... I was able to get the Stacy to power up after I hooked up the +5 and GND via the floppy connector. Now I can breathe a sigh of relief that I didn't fry the Stacy.
Atari Stacy 4 w/T25 Accelerator. External Ultrasatan. Working on Stacy color monitor upgrade via RGB2HDMI.
Atari Mega STE 4/350. SCSI disconnected. External Ultrasatan.
Atari 600XL (in the progress of upgrading with U1MB, Sophia 2, etc.)
Atari 130XE with CSS Ultra Speed Plus OS 320kb
ATR8000 and a bunch of other Atari goodies
Atari Mega STE 4/350. SCSI disconnected. External Ultrasatan.
Atari 600XL (in the progress of upgrading with U1MB, Sophia 2, etc.)
Atari 130XE with CSS Ultra Speed Plus OS 320kb
ATR8000 and a bunch of other Atari goodies
Re: Stacy nano psu upgrade
Congratulations!
PS Where's the pictures? We *love* pictures man!
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