So, if you [DEFAULT] the item z142, it is given the name 'Custom Item 20' - but if you [DEFAULT] z143 it becomes '(null)' - an item with no properties, and the name '(null)'. z144 becomes the same, except it's called 'Sword 1 (Wooden)' - and this continues on through the array of names. Interestingly enough, this goes on to WEAPON names, such as z175 being 'MISC: Boomerang 2 (Magic) Sparkle' and z180 being 'Whirlwind (Enemy)'. z230 appears to be 'MISC: Quarter Hearts'. z231, again, is '(null)'. z232 is 'bad allocation'. z233 is blank. z234 is two ASCII characters that render differently between the two fonts. z235, z236 is blank. z237 is more ASCII characters. z238 is '(null)'. And finally, z239 crashes (via drwtsn32.exe, AKA "zquest-w.exe has generated errors and must be closed"😉.
Fun, eh?