Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!uunet!husc6!hao!ames!ptsfa!ihnp4!alberta!calgary!crash From: crash@calgary.UUCP (Glen ) Newsgroups: comp.sys.atari.st Subject: Help with Hard Disk Interface Message-ID: <1226@vaxb.calgary.UUCP> Date: Thu, 26-Nov-87 15:59:26 EST Article-I.D.: vaxb.1226 Posted: Thu Nov 26 15:59:26 1987 Date-Received: Sun, 29-Nov-87 22:32:17 EST Organization: U. of Calgary, Calgary, Ab. Lines: 20 I need some help with the Atari Computer System Interface (ACSI) level one protocol. In the developers docs it says "transfer data in 16 byte increment blocks" [ACSI Application Notes, page 11]. What happens after 16 bytes??? Is the next byte an crc, checksum or something???? Or is the next byte just the beginning of the next 16 bytes???? On the logic analyzer I just saw a long stream of DRQ and ACKs with no division after 16 bytes. Is there a header and/or trailer byte for these 16 bytes or what? Is there a AHDI Document as referenced in the "Engineering Hardware Specification of the Atari ST?" If so, I didn't get it. Did anyone else???? Does it answer any of my questions? Reply to me or net Thx ...!alberta!calgary!crash Glen Stone