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I just updated the cloud cpm to support the new feature for NABULIB that allows querying a constant memory address that returns the current visible column width. This means programs can be f18a (80 display column) aware. I know you can query a register to see if there's an F18a, but for raw cpm programs using BDOS, it makes sense to just check that variable and not mess with the video register.

On that note, the RetroNET Chat is now f18a aware, so it can work in 80 column. See this image...