Thread: Halt1
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Old 12 January 2014, 11:54   #3
Toni Wilen
WinUAE developer
 
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 42
Posts: 19,513
HALT means CPU double-faulted. Real 68k CPU stops (only reset restarts it) if bus or address error is detected when CPU is currently storing exception stack frame. (Usual cause is corrupted stack pointer).

Writing stack frame to stack pointer which points to non-existing memory or is odd is also considered hardware generated bus error in UAE and causes immediate HALT condition.
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