tag:blogger.com,1999:blog-6264947694886887540.post276186601431337636..comments2024-03-27T22:51:35.227-07:00Comments on Ken Shirriff's blog: Reverse-engineering the register codes for the 8086 processor's microcodeKen Shirriffhttp://www.blogger.com/profile/08097301407311055124noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-6264947694886887540.post-28004874973356663482023-03-28T12:38:24.578-07:002023-03-28T12:38:24.578-07:00I mentioned on Hacker News an article that explain...I mentioned on Hacker News an article that explained the microcode / nanocode thing for the 68000. I have now found it, but can't post to that thread.<br /><br />https://dl.acm.org/doi/10.1145/1014198.804299<br /><br />"Microprogrammed implementation of a single chip microprocessor"<br />Skip Stritter and Nick Tredennick<br />SIGMICRO Newsletter, Vol 9, Number 4, December 1978Jecelhttps://www.blogger.com/profile/02539806202828905363noreply@blogger.comtag:blogger.com,1999:blog-6264947694886887540.post-40387714609214843542023-03-15T14:53:48.512-07:002023-03-15T14:53:48.512-07:00I think your Mastodon address should be @kenshirri...I think your Mastodon address should be @kenshirriff@oldbytes.spaceAnonymoushttps://www.blogger.com/profile/06017522540261235417noreply@blogger.comtag:blogger.com,1999:blog-6264947694886887540.post-34061691856063323612023-03-13T01:49:29.885-07:002023-03-13T01:49:29.885-07:00It's interesting to see that they made the cod...It's interesting to see that they made the codes for e g AL and AH differ in the fourth and fifth bits, while they differ in the third bit instead in the instruction encoding. But I suppose it makes the hardware that needs to decode the register numbers simpler.Toivo Henningssonhttps://www.blogger.com/profile/05599157383718975426noreply@blogger.com