Forum

Code : Tout sélectionner

3
	

General Purpose Output (ST):
The GPO pin is connected to the pin 6 of the internal sound chip YM-2149 and can be freely programmed by applications. Usually not used
External Clock Select (STE):
When this pin is grounded the Video shifter takes its clock from an external clock on pin 4.Do not switch clock source while the system is active

4
	

Monochrome detection (ST/STE):
This pin is connected to pin 17 of the MFP68901 circuit and is used to set the Atari in Hi-resolution when grounded and to Med/Low-resolution when left open. A transition on this pin generates a reset of the system. On a STE pin 3 must be left open for the detection to work.
External Video Clock (STE):
When pin 3 is grounded this input is used to provide an external video clock to the shifter. This allows synchronizing the video-timings with an external device so that a video Genlock device can be used without having to make any modifications to the Atari hardware.