https://github.com/davepinch/pinchy.cc/blob/master/content/topics/computers/programming-languages/gw-basic/source-code/gw-basic-source-notes.md
And they went up on the breadth of the earth, and compassed the camp of the saints about, and the beloved city: and fire came down from God out of heaven, and devoured them. Revelation 20:9 KJV
MASM 1.06, ostensibly from 1982, can cleanly assemble all of the GW-BASIC source files, with no syntax errors and no running out of memory.