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retro16 / acsi2stm

Atari ST ACSI to SD card converter with a STM32
GNU General Public License v3.0
159 stars 38 forks source link

There is a simpler and cleaner way to power acsi2stm #55

Open Greeniously opened 1 year ago

Greeniously commented 1 year ago

In the past they sold external floppydrives powered from the joystick ports, and they typically need 3-400mA during operation but upwards 1000mA when starting the motor.

And the 5v on the joystick ports are fed directly from the PSU.

So I do believe powering ACSI2ST from the joystick ports should work just as well as getting it from the PSU directly.

On STE (and F030 aswell if I had a device in need of a small amount of 5v) I would personally get it from the extended joystick ports (also fed directly from the PSU).

Oh, great project, I've been watching!

// Greenious/Atari-Forum

retro16 commented 1 year ago

Hi Greeniously,

Thanks for your feedback. That's indeed a good solution. ACSI2STM consumes very little power anyway. The power jack connector was meant to be connected to any 5V pin of any ST right from the start, by using a custom cable.

The upcoming compact PCB will be powered by a 5V USB-C socket (no complex protocol such as power delivery) so it will still be trivial to modify a USB-C to USB-A cable into a USB-C to ST joystick cable to tap power from the joystick port.