From: Marko Mäkelä (marko.makela_at_hut.fi)
Date: 2003-08-26 08:07:09
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----- Forwarded message from owner-cbm-hackers@cling.gu.se -----
Date: 25 Aug 2003 23:18:23 +0100
From: "Jacob Dahl Pind" <rachael@rachael.dyndns.org>
To: cbm-hackers@cling.gu.se
Message-ID: <1897.367T1150T13982818rachael@rachael.dyndns.org>
MIME-Version: 1.0
Subject: Re: Track/Sectors for older Drives, eg D9090
on 25-Aug-03 09:53:07, ncoplin wrote:
>Hi All,
>I'm a little confused about the track/sector information given by various
>sources (including the Inner Space Anthlogy) for some of the older drives.
>They talk also about cylinders... and that confuses me.
>What I'm after is "logical" info, that is the layout a programmer would use.
>I am thinking that the D9090 is laid out as: 918tracks (1-918), 32 sectors
>(0-31). etc.
>Can someone confirm this, and also the layouts of the other drives of this
>era? is there a standardised detection routine for the D9060/9090? It seems
>you can stick any mechanism in the box and it will work... but...
>Regards, Nick
The following is taken from Commodre Disk referance manuale for D9090 D9060
8250 8050 4040 2031.
Model D9090 D9060
heads per drive 6 4
formatted storage
capacity per unit 7,47Mb 4,98Mb
cylinders(tracks) 153 153
sectors/cylinders 128 192
sectors per track 32 32
blocks per sector 256 256
it doesnt say anything about how to detect 9090 or 9060, but a quick look at
its bam and then simply count how many BAM sectors you encount, should do the
trick.
D9060/9090 BAM block format 0 track 1 sector 0 (normal location)
Byte Date Definition
0-1 Track-sector pointer to next BAM block
(hexdecimal $FFFF = last bam block)
2-3 Track-sector pointer to privious bam block
(hexdecimal $FFFF = first bam block)
4 lowest track # mapped in the BAM block
5 Higest track #(+1) mapped in this bam block
6 nummber og blocks unused on the track
7-10 bitmap of avaliable blocks on this track
11-255 bitmap of next 49 track
Someday I`ll get that Commodre Disk referance manuale for D9090 D9060
8250 8050 4040 2031 OCR scanned.
Regards Jacob Dahl Pind
--
CBM, Amiga,Vintage hardware collector
Email: rachael@rachael.dyndns.org
url: http://rachael.dyndns.org
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