On screen display support (OSD overlay)

https://www.youtube.com/watch?v=SgBVGKGoaVU

OSD File selector demo :

https://www.youtube.com/watch?v=Kl1FX8N-ILo

You only need 2 wires and a resistor to connect the Gotek to the machine’s video signals : One wire is used for the CSYNC video signal (Composite Sync), the other wire for the red, green (prefered) or blue signal.

One resistor must be put in serie on the color signal between the Gotek and the machine. You can use a value between 220 and 470 ohms for this resistor. A potentiometer can be also used to tune the OSD brightness/contrast.

This was currently tested on Amiga 500, Atari STE and Amstrad CPC 6128 machines, but should work with any machines having a composite sync signal.

On machines without CSYNC signal available you can enable the additional input for the VSYNC signal at Gotek U8 Pin 1 (PB12) on the custom firmware page : https://hxc2001.com/custom_fw/

Gotek wiring :

Amiga 500 :

OSD Video out : Gotek U8 Pin 5 (PB15) → 220 / 470 ohms resistor (or a 1k ohms potentiometer) → Amiga 500 Ferrite bead E432 (see picture). OSD Video CSYNC in : Amiga 500 U41 Pin 8 → Gotek "JTCK-SWCLK" pin (PA14) (near the serial tx programming pin, please see picture).

Amstrad CPC6128 :

OSD Video out : Gotek U8 Pin 5 (PB15) → 220 / 470 ohms resistor (or a 1k ohms potentiometer) → CPC6128 R128 (see picture). OSD Video CSYNC in : CPC6128 IC116 Pin 5 → Gotek "JTCK-SWCLK" pin (PA14) (near the serial tx programming pin, please see picture).

Atari STE :

OSD Video out : Gotek U8 Pin 5 (PB15) → 220 / 470 ohms resistor (or a 1k ohms potentiometer) → Atari STE R420 (see picture). OSD Video CSYNC in : Atari STE R475 → Gotek "JTCK-SWCLK" pin (PA14) (near the serial tx programming pin, please see picture).