Path: csiph.com!news.swapon.de!eternal-september.org!feeder.eternal-september.org!mx02.eternal-september.org!.POSTED!not-for-mail From: D Finnigan Newsgroups: comp.sys.apple2,comp.sys.apple2.programmer Subject: Re: Uthernet II manual updated, probe algorithm corrected Date: Fri, 8 Jan 2016 17:49:51 -0000 (UTC) Organization: Mac GUI Lines: 34 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Injection-Date: Fri, 8 Jan 2016 17:49:51 -0000 (UTC) Injection-Info: mx02.eternal-september.org; posting-host="ac9e0e4d7dd3957fb97803ee6801bab8"; logging-data="14381"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX19j8QVndwGjARjpzj3JggB3" User-Agent: Mac GUI Usenet In-Reply-To: Cancel-Lock: sha1:9qyKTCvAxH7KV636GNP83ub9kSs= Xref: csiph.com comp.sys.apple2:26646 comp.sys.apple2.programmer:2069 D Finnigan wrote: > The programming section is pretty good, but still not complete. Today I > added a new section on probing for the Uthernet II on page 37. It suggests > an algorithm to use for programmatically detecting the presence of the > Uthernet II based on the behavior of the W5100 chip. I also fixed some > typos > in the manual, including one in the sample source code on page 23. > > Visit the http://a2retrosystems.com/ web site, and click the manual link > where it says "Please download the manual". > I updated the manual again today to correct the new Uthernet II/W5100 probing algorithm on page 37. It failed to detect the W5100 if it had previously been used and its internal address pointer was not at zero. I had *assumed* that sending the $80 software reset command to the W5100 would also reset the internal address pointer to 0, but noooooooo, that doesn't happen. So I removed the last test which was to LDA $C0x7,X and CMP #3, because we can't assume the state of the address pointer. Hum-ho….. Also coming soon: an improved and less headache-inducing data transfer loop that eradicates that ridiculous split-copy algorithm for buffer wraparound. Ugh. -- ]DF$ The Marina IP stack for Apple II-- http://marina.a2hq.com/