Path: csiph.com!eternal-september.org!feeder.eternal-september.org!mx02.eternal-september.org!.POSTED!not-for-mail From: D Finnigan Newsgroups: comp.sys.apple2.programmer Subject: Re: Activating Soft-Switches in Assembly Date: Wed, 30 Mar 2016 18:28:13 -0000 (UTC) Organization: Mac GUI Lines: 17 Message-ID: References: <634b1674-1319-4795-b04c-37e52130c2b0@googlegroups.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Injection-Date: Wed, 30 Mar 2016 18:28:13 -0000 (UTC) Injection-Info: mx02.eternal-september.org; posting-host="ac9e0e4d7dd3957fb97803ee6801bab8"; logging-data="6281"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+8Qpp4gLjtmKLc5Hyj5jFx" User-Agent: Mac GUI Usenet In-Reply-To: Cancel-Lock: sha1:6fYM5S63ryGiYw+pYso5cSaMzWA= Xref: csiph.com comp.sys.apple2.programmer:2613 alxmist wrote: > > and how do I activate them either way? Do > the $C050's require a JSR? > No, you just reference the location with a load instruction. Use whichever (A,X, or Y) is convenient in your code. Don't try to JMP or JSR to the soft switch location, because there's no valid instructions there for the 6502 to execute. -- ]DF$ The Marina IP stack for Apple II-- http://marina.a2hq.com/