place some routines at well known expected locations.

c64/kernal/irq_handler.s

@@ -1,32 +0,0 @@
-irq_handler:
-	;; The IRQ is a commonly messed with thing on the C64,
-	;; so we need to handle entry points that are commonly
-	;; relied upon, including:
-	;; $EA31 - Standard IRQ routine
-	;; $EA61 - Check keyboard, but don't update timer? https://github.com/cc65/cc65/issues/324
-	;; $EA81 - https://www.lemon64.com/forum/viewtopic.php?t=2112&sid=6ea01982b26da69783120a7923ca46fb
-	;; Also the $0314 vector is widely used (e.g., https://www.lemon64.com/forum/viewtopic.php?t=2112&sid=6ea01982b26da69783120a7923ca46fb)
-	
-	;; Save registers
-	;; Sequence according to Compute's Mapping the 64 p73
-	pha
-	txa
-	pha
-	tya
-	pha
-
-	;; Acknowledge CIA interrupt
-	lda $dc0d
-	
-	;; Call interrupt routine
-	;; (but only if initialised)
-	lda $0314
-	ora $0315
-	beq default_irq_handler
-	jmp ($0314)
-default_irq_handler:	
-
-	jsr blink_cursor
-	jsr scan_keyboard
-
-	jmp return_from_interrupt