+retroclouds Posted September 11, 2021 Share Posted September 11, 2021 Is there an easy way to detect -from an assembly program running on the ISR-, if TI Basic is in command mode or if it is running a program? Please note, that I’m talking about TI Basic as included in the TI-99/4a console. I’m not talking about Extended Basic or any of the derived basics in a cartridge or FG99. Perhaps, some background information. I’m jumping into TI Basic out of my Stevie editor after setting a ISR that allows me to return to the editor. The way I’ve implemented right now is plain easy, but also kinda cool. I just check the sound address in scratchpad memory. If it’s set it just returns to the editor. Reason why it’s kinda cool is, that as soon as TI Basic honks because of a syntax error or similar, you are returned to the Stevie editor. Will probably change that in the future, but as it is now it’s really easy to return to the editor. What I have in mind is, that after I jump into TI Basic the ISR kicks in and pokes TI Basic tokens into VDP memory. Or is it possible to setup VDP memory in advance and jump into TI Basic without it going through its initialisation where it clears VDP memory? Quote Link to comment Share on other sites More sharing options...
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