Help with SP0256 speech synthesizer chip (1980's TTL) from a Raspberry Pi

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qthetech

Joined Nov 6, 2020
1
Good day all- I'm new here, so please forgive me for reviving an old thread.

I discovered this thread while doing some research for my current project- I hope my reply here is relevant to the original post since I'm going in the opposite direction signal-wise.

I'm looking to control a 1980's era SP0256 speech synthesizer chip (1980's TTL) from a Raspberry Pi 2. As far as I can tell- I'm only inputting into the SP0256 from the Pi GPIO, I don't require any feedback data back into the Pi (if so I'd use the methods outlined above). Are there any issues with direct input from a Pi GPIO to TTL? More of concern- is there any risk of damage to the Pi if inputting directly to TTL?


Mod: link to other thread
https://forum.allaboutcircuits.com/...to-raspberry-pi-gpio-3-3v.166842/post-1477844
 
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