Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!linus!philabs!cmcl2!harvard!husc6!panda!genrad!decvax!wanginst!wang!ephraim
From: ephraim@wang.UUCP (pri=8 Ephraim Vishniac x76659 ms1459)
Newsgroups: net.micro.mac
Subject: Re: Delphi Mac Digest V2 #19
Message-ID: <812@wang.UUCP>
Date: Wed, 21-May-86 09:46:51 EDT
Article-I.D.: wang.812
Posted: Wed May 21 09:46:51 1986
Date-Received: Sat, 24-May-86 04:52:18 EDT
References: <4983@topaz.RUTGERS.EDU>
Organization: Wang Labs, Lowell MA
Lines: 31

> Delphi Mac Digest          Sunday, 18 May 1986      Volume 2 : Issue 19
> ---------------------------------------------------------------------- 
> From: DDUNHAM (7975)
> Subject: DA limit
> Date: 10-MAY 01:13 Macintosh In Fact
>  
> >Does anyone know why the Font/DA Mover refuses to put more than 15 DA's
> >in the system file?
>  
> Because Apple doesn't understand how people really want to use the
> Mac. They decided to reserve some of the DRVR slots for dynamic
> allocation. So far, nobody's using them.
                      *******Wrong*******
> It's possible to install more DAs using the DA Installer from Dreams of the
> Phoenix, or using ResEdit.  (On a Mac+, it's possible to give DRVRs IDs from
> 32-47, so you can get enough DAs in to scroll!)
>  
> (These slots in the unit table are officially reserved by Apple, BTW.)

They are also *used* by Apple and by developers following the development
guidelines!  The "dynamic slots" are used (that I know of) by the printer
drivers and by my hard disk driver.  I intend to convert my ramdisk to use
a dynamic slot, too.  I expect that other authors are using them as well.
Ever looked into your Imagewriter file with ResEdit?
The driver number is not in the usual range, which suggests dynamic 
assignment of the actual number.

The numbers from 32-39 are reserved for SCSI devices 0 - 7.  Since these
devices are supposedly guaranteed the use of these slots, they don't check for
conflicts.  And since the SCSI drivers don't live in the system file,
the DA mover won't notice the problem until it's too late.