Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.2 9/5/84; site tmq.UUCP
Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!ihnp4!tmq!darin
From: darin@tmq.UUCP (Darin Adler)
Newsgroups: net.micro.mac
Subject: Re: RamDisk technical query
Message-ID: <191@tmq.UUCP>
Date: Mon, 27-May-85 17:48:20 EDT
Article-I.D.: tmq.191
Posted: Mon May 27 17:48:20 1985
Date-Received: Thu, 30-May-85 00:11:42 EDT
References: <622@wanginst.UUCP>
Distribution: net
Organization: tmq/ICOM Buffalo Grove, IL
Lines: 22

> I'm trying to understand what makes a Mac ramdisk "eject-proof." ...
> 
> ... I've examined the drive queue and the volume control block queue in some
> detail and been unable to find any useful difference between these two
> ramdisks ...
> 
> ...  Can anyone shed some light, or point me to an especially
> enlightening passage in Inside Mac (loose-leaf edition)?
> 

The useful information is on pages 62 and 63 of the File Manager Programmer's
Guide (Inside Mac loose leaf 5/21/84).  In a box labeled Assembly-language note
we find the following table entry:

The first four bytes in a drive queue ...
byte 1, contents: 0=no disk in drive, 1 or 2=disk in drive, 8=NONEJECTABLE disk
		  in drive, FC-FF=disk was ejected in last 1.5 seconds.

Just stuff an 8 in there.

Darin Adler
ihnp4!tmq!darin