disabled BRK handling, breaks at least one game

STATUS.md

@@ -27,6 +27,7 @@ The following ROM features are currently missing:
 * tape support
 * RS-232 support
 * breaking Kernal routines with RUN/STOP key
+* BRK handling
 * PAL/NTSC is detected, but for now only startup banner uses the result
 
 Features currently being worked on:

c64/kernal/interrupts/irq_handler.s

@@ -17,10 +17,11 @@ irq_handler:
 
 	;; Check if caused by BRK
 
-	tsx
-	lda $0104, x ; get the pre-interrupt processor state
-	and #$10
-	bne irq_handler_brk
+	;; XXX disabled for now - resets Duotris game, unknown why
+	; tsx
+	; lda $0104, x ; get the pre-interrupt processor state
+	; and #$10
+	; bne irq_handler_brk
 
 	;; Not caused by BRK - call interrupt routine (only if initialised)
 	lda CINV