I remember Buffalo Bit User Fast Friendly Aid to Logical Operation, or something like that. I used it a lot on my own HC11 development board, some 20 years ago. Great uC this HC11, and with the monitor was easy to develop. I didn't use it at work though, it may have helped
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I remember Motorola's ftp site in those days, they had a lot of useful software. I have the vague idea that a BASIC interpreter for the HC11 was available there. The site is long gone, I wonder if the archive.org has a copy of it. I may have a copy, the only problem is where....