Article View: comp.sys.mac
Article #25811Re: dqDrvSiz
From: ephraim vishniac
Date: Tue, 01 Mar 1988 14:36
Date: Tue, 01 Mar 1988 14:36
15 lines
1284 bytes
1284 bytes
In article <978@ut-emx.UUCP> rick@ut-emx.UUCP (Rick Watson) writes:
>Does anyone remember the extension made to the drive queue entry
>to allow drives with more than 65536 blocks? It had something to do
>with putting the high-order bits somewhere else, but I can't remember where.
The high-order sixteen bits of the drive size were put in a word
following the low-order sixteen bits (that's backwards, by 68000
standards). To distinguish drive queue elements which used this
extended format, the queue element type was changed from zero to one.
Ephraim Vishniac ephraim@think.com
Thinking Machines Corporation / 245 First Street / Cambridge, MA 02142-1214
On two occasions I have been asked, "Pray, Mr. Babbage, if you put
into the machine wrong figures, will the right answers come out?"
Technical Details
Message-ID:
<17351@think.UUCP>Path:
arc1-ca.pugleaf.net!utzoo!mnetor!uunet!lll-winken!lll-lcc!ames!pasteur!ucbvax!bloom-beacon!think!ephraimReferences:
<978@ut-emx.UUCP>Show Full Headers
Complete Article Headers
Path: arc1-ca.pugleaf.net!utzoo!mnetor!uunet!lll-winken!lll-lcc!ames!pasteur!ucbvax!bloom-beacon!think!ephraim From: ephraim@think.COM (ephraim vishniac) Newsgroups: comp.sys.mac Subject: Re: dqDrvSiz Message-ID: <17351@think.UUCP> Date: 1 Mar 88 14:36:15 GMT References: <978@ut-emx.UUCP> Sender: usenet@think.UUCP Reply-To: ephraim@vidar.think.com.UUCP (ephraim vishniac) Organization: Thinking Machines Corporation, Cambridge, MA Lines: 14 Keywords: large drive