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From: perry@well.UUCP
Newsgroups: comp.sys.amiga
Subject: Re: losing MIDI bytes
Message-ID: <4029@well.UUCP>
Date: Fri, 25-Sep-87 00:53:31 EDT
Article-I.D.: well.4029
Posted: Fri Sep 25 00:53:31 1987
Date-Received: Sat, 26-Sep-87 15:26:14 EDT
References: <755@mtuxo.UUCP> <2374@cbmvax.UUCP> <7423@steinmetz.steinmetz.UUCP>
Reply-To: perry@well.UUCP (Perry S. Kivolowitz)
Organization: Whole Earth 'Lectronic Link, Sausalito, CA
Lines: 18
Summary: VD0: does not have a timer

Contrary to what others  have  said, there  is no timer based processing
going on in the ASDG recoverable ram disk driver. The action of cleaning
out the ram disk and compacting is driven in two phases:

Every 128 Writes: cleaning and compaction
Every 256 Accesses (either write or read): compaction

cleaning is  defined  as  releasing  tracks which  are  no longer in use.
compaction is defined as checking the spread of the ram  disk around your
memory. This may result in the RRD moving things around to make more chip
ram available or reduce fragmentation.

(these two features are often overlooked but because of them, the ASDG
RRD while the first RRD ever made for the Amiga, is still in some ways
the best :-)

Perry S. Kivolowitz
ASDG Incorporated