Subject: Re: [stella] Space Savers From: "Edwin Blink" <edwin.blink@xxxxxxx> Date: Fri, 3 Sep 2004 20:50:48 +0200 |
Manuel wrote: >FFFE is the BRK vector as well :-) Bang ! Somehow I mixed things up and thought BRK used NMI vector. Thanks for pointing this out to me (Chris too!). >> STA SWACNT ;Set PORTB to inputs >> STA SWBCNT ;Set PORTA to inputs >> ;Just with 4 default variables there is already a byte saving of 3 bytes! >Save another 6 bytes by removing those two STAs... ;-) So you don't need to initialize those RIOT ports ever ??? Thomas Wrote: >...and another byte by removing SEI. I thought I leave it in just in case. Chrish Wrote: >There was a discussion of this a while back. The 2600 doesn't have an >interrupt line, and the 6507 doesn't have an interrupt pin, but the silicon >die has the interrupt. It's there, it just isn't bonded out to a pin. >What are the chances that you have a cosmic ray come through and do funny >things with your 6507? Not big enough. But if you're being paranoid... >I think someone else had a more realistic reason for using the SEI on the >2600, but I don't remember what it was... I'm sure the IRQ line is pulled up internally. But I can imagine it could act weird while the VCS is powering up. Back to Thomas: >BTW: Welcome Edwin! :-) Thank you for the Welcoming (you and others!). Tried to subscribe earlier over a month ago but it didn't work then and with the archives not beeing updated I thought stella was dead. Luckely I found a link somewhere on AA forum that did work and found stella alive and kicking :-) Edwin
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