Subject: Re: Re: [stella] Why do we use the SEI instruction??? From: Dennis Debro <ddebro@xxxxxxxxxxxxx> Date: Mon, 4 Aug 2003 11:36:35 -0400 |
Hi Eric, > Although the 6507 doesn't have NMI or IRQ pins, it's good programming > practice to have those vectors point somewhere, either the same as RESET or > an RTI instruction. (And to include an SEI instruction in your > initialization section.) That way if the 6507 flakes out it won't crash > horribly. If you used BRK to jump to a subroutine then I can understand using SEI. But if you just point the IRQ to RESET (which most of us do), then is it needed? Take care, Dennis ---------------------------------------------------------------------------------------------- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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