Welcome to the Lounge

trønderen wrote:

You continue to impress everyone around here. Boy, are you clever!

M.D.V.

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.

trønderen wrote:

Or do you follow the tradition from 50 years ago, with every instruction/statement left justified?

raster_irq: {
	lda flag
	and #popup_on
	bne bottom		// popup is active

	lda $d012
	cmp #raster_irq_bottom_line
	bcc top

bottom:
	lda #charset2	// set secondary charset (for bottom half of the screen)
	sta $d018

	lda #raster_irq_top_line
	sta $d012

	jmp end

top:		
	lda #charset1	// set primary charset (for top half of the screen)
	sta $d018

	lda #raster_irq_bottom_line
	sta $d012

end:
	asl $d019		// clear pending
	jmp $ea31		// finish interrupt
}