Hi Tom,

Yes, that buffer works well for text based programs. There is also the ALTLCD buffer that can be used (carefully) to save data. Unfortunately those buffers don't save any graphics content, so that still has to be read back from RAM in the LCD controller chips directly.

Ken

On 8/3/21 11:48 AM, Tom Wilson wrote:

     now, that I'm working on a new game, I'm looking to read directly
    from the screen with the input port.


The good news is that there IS a character buffer, so you can read back text data from the screen.On a 32K T102, the buffer starts at 65024. It's likely going to be different on other machines and memory configurations, though.


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