Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 exptools 1/6/84; site ihnss.UUCP Path: utzoo!linus!decvax!decwrl!amd!dual!zehntel!ihnp4!ihnss!knudsen From: knudsen@ihnss.UUCP Newsgroups: net.micro.6809 Subject: What's in SAM Chips's ROM? Message-ID: <2272@ihnss.UUCP> Date: Wed, 24-Oct-84 13:41:07 EST Article-I.D.: ihnss.2272 Posted: Wed Oct 24 13:41:07 1984 Date-Received: Mon, 29-Oct-84 08:06:03 EST Organization: AT&T Bell Labs, Naperville, IL Lines: 15This is for anyone whose 6809 system includes the 6883 SAM chip, such as found in CoCos. Anyone know the purpose/function of the internal ROM's bytes from about $FFE0 (sorry, I'm at work and Coco is at home) thru $FFF1? The data are definitely read-only, but don't seem to make any sense either as 6809 opcodes or as address vectors. The Motorola books refer to them as "reserved for system use" (which covers everything above $FF60, and we all ignore that, don't we), BUT one footnote implies they may be a disk boot, like for a DOS. Now wouldn't that be nice... but it sure doesn't look like 6809 code to me. I wonder if we all even have the same data in those bytes. Could they be a version or even serial number? Imagine, copy-protecting software by having it check the SAM serial #. If anyone acts interested, I'll post my SAM's values when I get home. --mike k.