Last Mist firmware bug ?

[tricipi]

Hello,

Once updated my Mist (1.4) with new firmware, I found the following behaviour with Minimig core : every time I pull the DB9 joystick connected to port #1 to right position, the video signal is forced a "reset" (NO INPUT SIGNAL ). I have not yet tried with previous firmware, but restoring the old "factory" firmware present (161229) this problem is not present.

By
tricipi

[gyurco]

I cannot imagine how the DB9 ports can affect the video output. Probably only if your joystick short-circuits the +5V line if you move it to the right.

[tricipi]

Ok, but it happens only with lastest firmware update. The 200622 version is not affected. Meanwhile I try to find the "last" firmware version without this problem

[tricipi]

Furthermore, It happens with various DB9 joystick, not only one, and this does not happens with other cores (i.e. th C64 one)

[gyurco]

Is this happens with the port used normally for the mouse on Amiga? That might confuse the Amiga HW/Amiga OS, but I still don't see how the firmware would be connected to this. The video output is totally independent of the ARM CPU (it's on the FPGA).

[Julitium]

Hi.
Beware of megadrive (genesis) pads.
It is known that they can cause a short circuit in the port.
All the best

[gyurco]

The megadrive pads are safe, but only 2 buttons are usable. However the Sinclair SJS1 joysticks with their shuffled pinout are hazardous.

[gyurco]

BTW, I would try with a different power supply. The current flowing in the joystick might introduce noise (as it's a fairly long cable, think about it as an antenna), or simply overloading the current PSU.

[gyurco]

Actually I'm not sure if the latest Minimig-AGA core fully works with such an old firmware.

[harbaum]

Does this happen with a simple Atari style joystick? If not being touched these don't create any connection at the port at all. There is no electrical difference between no joystick connected and a simple classic joystick connected in center position and fire button unpressed.

This sounds to me like you have some bad solder joint in your MIST or the like. I cannot imagine how this should relate to the firmware.