MON 60B 154B - IDBUGSW (DEBUG-SWAPPER on/off)

Turns swapper debugging on or off. When turning on (5D12=1), checks that no one else is using the ND-500.

Status: dispatch byte-verified; body from 5P-P2-MON60.NPL (.npl); L07 body loc pending.

Handler (verbatim in .npl)

IF 5D12=1 THEN CALL XTUSON; GO FAR ERET (on: fail if in use); else GO FAR 5NOPAR.

Byte status

VERIFIED: dispatch + 5IFUNC (154 not in 0..142 doc range; live-but-undocumented, matches caller's >142B note). From NPL: body. PENDING: L07 body address.