the software i'm using by the way is PC-BASIC which i found out about yesterday
it's a modern recreation of GW-BASIC, BASICA et al, simulating many video modes including Hercules and even Tandy 3-channel sound
https://robhagemans.github.io/pcbasic/
the book targets C64, TRS-80, Spectrum and Apple, so we'll find out what bugs arise and need to be fixed only once i'm done typing and try to run it
fwiw the parser on this is equal parts extremely clever and extremely jank - only the first 3 letters of a command are parsed
yes part of the typos keeping it from working were here π
oh nevermind!
went to check on a dumped BBC copy of the game (it has a fancy title screen, perhaps usborne published it as a disk at some point, or a superfan made a very fancy version?) and the behaviour i thought was a parser bug is there just as on my conversion
well, time to test play it through then :)