Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!usc!sdd.hp.com!decwrl!ogicse!intelhf!agora!billsey
From: billsey@agora.uucp (Bill Seymour)
Newsgroups: comp.sys.amiga.hardware
Subject: Re:  GVP Trade-in
Keywords: SCSI, GVP
Message-ID: <1990Sep4.213845.2043@agora.uucp>
Date: 4 Sep 90 21:38:45 GMT
References: <14069@cbmvax.commodore.com> <1990Aug30.121102.11096@hod.uit.no> <1151@mpirbn.mpifr-bonn.mpg.de>
Organization: Open Communication Forum
Lines: 25

In article <1151@mpirbn.mpifr-bonn.mpg.de> p554mve@mpirbn.UUCP (Michael van Elst) writes:
>Scanline frequency is about 15.7KHz. If there are three free slots per
>scanline, you can transfer 3*15.7K words per second -> 94.2Kb/sec.
>MFM data comes with 500Kbit/sec == 62.5KB/sec. Therefore the disk-DMA
>does not use every slot but if only two slots were available you would
>need extra buffers and a slow genlock signal might induce disk-DMA failures.

	Actually, with the current Paula chips, data transfer from the floppies
	is done at 250Kbit/sec. Not the 500Kbit.sec that the HD type drives
	do. That's why it's so much trouble to get the 1.76M floppies working
	on the Amiga.

>Regards,
>-- 
>Michael van Elst
>UUCP:     universe!local-cluster!milky-way!sol!earth!uunet!unido!mpirbn!p554mve
>Internet: p554mve@mpirbn.mpifr-bonn.mpg.de
>                                "A potential Snark may lurk in every tree."


-- 
     -Bill Seymour             ...tektronix!reed!percival!agora!billsey
=============================================================================
Bejed, Inc.       NES, Inc.        Northwest Amiga Group    At Home Sometimes
(503) 281-8153    (503) 246-9311   (503) 656-7393 BBS       (503) 640-0842