From: Marko Mäkelä (marko.makela_at_hut.fi)
Date: 2003-08-26 08:07:09
The following message was sent from an unregistered address. (Allowing only subscribers to post keeps unsolicited messages away from this list.) ----- Forwarded message from firstname.lastname@example.org ----- Date: 25 Aug 2003 23:18:23 +0100 From: "Jacob Dahl Pind" <email@example.com> To: firstname.lastname@example.org 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: email@example.com url: http://rachael.dyndns.org ----- End forwarded message ----- Message was sent through the cbm-hackers mailing list
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