;; #LAYOUT# STD *        #TAKE
;; #LAYOUT# *   KERNAL_0 #TAKE
;; #LAYOUT# *   *        #IGNORE

;
; Official Kernal routine, described in:
;
; - [RG64] C64 Programmers Reference Guide   - page 291
; - [CM64] Computes Mapping the Commodore 64 - page 232
;
; CPU registers that has to be preserved (see [RG64]): none
;

RDTIM:

	; Disable interrupts for the duration of the routine, to prevent
	; jiffy clock update while reeading its values
	sei

	; Store the jiffy clock state
	ldy TIME+0
	ldx TIME+1
	lda TIME+2

	; Enable interrupts. More elegant solution would be pha + sei + ... + pla,
	; but (checked by running a test program) original ROM routine always
	; leaves IRQs enabled.
	cli
	rts