Subject: Re: [stella] interrupts? From: "Eric Ball/Markham/IBM" <eball@xxxxxxxxxx> Date: Tue, 23 Apr 2002 15:26:49 -0400 |
Also consider that an interrupt automatically pushes the PC & PSR on the stack and you only have 128 bytes of RAM. "Eckhard Stolberg" To: <stella@xxxxxxxxxxx> <Eckhard_Stolberg cc: @web.de> Subject: Re: [stella] interrupts? Sent by: owner-stella@bigl ist.com 04/23/2002 02:45 PM Please respond to stella > When (if ever) do we get an interrupt? Is it possible to have the > timer reaching zero to cause an interrupt? Or must it be polled? The 6507 processor has the interrupt pin removed to save costs. Therefore it isn't possible to trigger an interrupt on the VCS. The timer could generate an interrupt, but the processer won't be able to sense it. You'll have to poll the timer, I'm afraid. Ciao, Eckhard Stolberg ---------------------------------------------------------------------------------------------- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/ ---------------------------------------------------------------------------------------------- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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