John Becker made a unique assembler and bundled it with his TK3
John didn't 'make' it, he simply bundled a shareware assembler with the TK3, rather bizarrely he'd never even heard of MPASM or the MicroChip tools at all, until I spoke to him about them. If he'd heard of MPASM he'd have used that, but by the time I spoke to him he was committed to using the non-standard assembler.