exxos's Atari, Amiga & retro forum

This was added in on the current schematic.. But really as I am planning to adding buffers to place some other chips, I would assume the shifter MONO output is actually a digital one, and just switches between 0V & 5V ? So digital buffer should be okay here ?

This way we would save on there few parts not having to have basically a analogue buffer...

The Shifter's MONO output is digital and TTL level, yes. The SM124's input is rated for nominally 1Vpp, though. This is why you have the divider R32/R33 and the emitter follower in the Atari ST.

ah crap, thanks!