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65529floating around my head when I read the question. According to [Microsoft Basic Decoded [...] for the TRS-80](doc.lagout.org/science/0_Computer%20Science/…) [PDF, 1.5MB], comments on pages 193 and 199 (195 and 201 of the PDF) suggest65534is the "Initial BASIC line number", part of the IPL (initial Program Loader). [cont]1A09on page 199/201 correctly), if a STOP/END on line 65534 is encountered, the BASIC interpreter jumps to the IPL entry-point in the ROM. Not sure whether this is "simply" part of the power-on sequence: address1919[in ROM, copied to40A2during IPL] on page 193/195 holds "line number 65534", and the next address [191BROM, copied to40A4] is the "PST" where tokenised BASIC is held. See also "Reset Processing (non-disk)" on page 13 (15 in PDF) or a way for a BASIC program to "reset" things on exit.