[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: 13-sector Disk ][ boot code won't boot
- Subject: Re: 13-sector Disk ][ boot code won't boot
- From: Andy McFadden <fadden@fadden.com>
- Date: 11 Oct 2007 21:00:27 GMT
- Newsgroups: comp.sys.apple2
- Organization: faddenInternet, Inc.
- References: <KlhPi.6739$4V6.6681@newssvr14.news.prodigy.net> <fem1dh$1ajl$1@merope.saaf.se>
- User-agent: tin/1.9.2-20061021 ("Benmore") (UNIX) (Linux/2.6.20-16-generic (i686))
- Xref: g2news2.google.com comp.sys.apple2:4291
Paul Schlyter <pausch@saaf.se> wrote:
> On 13 sector disks, the nibblizing of the very first sector was different
> than for the other sectors - presumably, this was to be able to squeeze
> that different denibblizing code into the 256 byte boot PROM.
This is also why, if you open t0s0 of a 13-sector .nib image in CiderPress,
you won't see anything that looks like reasonable 6502 code. I thought
about adding an alternative de-nibblizer to the menu, but since the
disk sector viewer doesn't have a "disassemble" feature it didn't seem
worthwhile.
--
Send mail to fadden@fadden.com (Andy McFadden) - http://www.fadden.com/
Fight Internet Spam - http://spam.abuse.net/spam/ & http://spamcop.net/