baffle

baffle Is an extension to BF language (https://esolangs.org/wiki/brainfuck), which itself in turn is a extension of Turing machine. baffle extends BF by adding a stack, support for procedures, adding more arithmetic instructions, and a register. baffle can run original BF programs, and while it's not the fastest implementation of BF, but it's written in such a way that makes it easier to replace the instruction set, and to write similar languages.
Every cell is a single byte, and the tape wraps.