reset-related fixes

src/kernal/interrupts/hw_entry_nmi.s

@@ -15,16 +15,12 @@ hw_entry_nmi:
 	; Call interrupt routine (only if initialised)
 	pha
 
-!ifndef CONFIG_MB_M65 {      ; XXX temporarily disabled for MEGA65, seems to cause crash during startup - to be investigated
-
 	lda NMINV+1              ; consider zeropage NMI address as uninitialized vector
 	beq @1                   ; this allows safer interrupt vector modifications 
 	pla
 	jmp (NMINV)
 @1:
 
-}
-
 	; Vector not initialized - call default interrupt routine
 	pla
 	jmp default_nmi_handler