ESC key pressed?

[a/b]

Eh, CIA banging would work fine if he would add a handshake to prevent buffering (assuming interrupts are off, which should be true since he said it's a demo). All the extra console/system stuff is not needed.
Also, what happens if you press a bunch of (non-handshaked) keys during the demo and then when you want to exit you press ESC?

Why not simply use a left mouse button? This ain't no pc dos or C64 (spacebar) :P.

edit: Something like this:

; frame start
	move.b	($bfec01),d0
	beq.b	no_key
	bset	#6,($bfee01)
	st	(handshake)
	sf	($bfec01)
; process key/d0...
no_key


; do your stuff here


; frame end
	tst.b	(handshake)
	beq.b	no_shake
	bclr	#6,($bfee01)
	sf	(handshake)
no_shake

; back to frame start


handshake
	DC.B	0

[ross]

I was even more brutal sometimes..
Premise: PORT IRQ off and previous keycode flushed.

; frame start
	bclr	#6,($bfee01)
        btst	#3,($bfed01)
	beq.b	no_key
	move.b	($bfec01),d0
	bset	#6,($bfee01)
; process key/d0...
no_key
; do your stuff here
; back to frame start

[Thomas Richter]

GetMsg() on the Window UserPort - even simpler, and without bad side effects.

[ross]

Originally Posted by ross

...and previous keycode flushed.

This probably isn't even necessary because from what I remember (but I could be wrong, I should double check it..) the kickstart uses a witless timed polling wait for the keyboard handshake, and so it's technically impossible to take-over the system when 'halfway'.

Usually when I use an IRQ to manage the keyboard I launch a timed IRQ for the handshake (at the exit of the previous CIA SP one) so as not to waste machine cycles.