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- Path: sparky!uunet!comp.vuw.ac.nz!waikato.ac.nz!aukuni.ac.nz!status!jonc
- Newsgroups: comp.sys.atari.8bit
- Subject: Re: Bootstrapping for the 8bit
- Message-ID: <FBw4XB3w165w@status.gen.nz>
- From: jonc@status.gen.nz (Jon Clarke)
- Date: Fri, 29 Jan 93 09:31:38 GMT
- References: <yabi.25.728174856@ellis.uchicago.edu>
- Organization: The Z*NET International News Gateway in New Zealand
- Lines: 41
-
- yabi@ellis.uchicago.edu (Scott Thomas Yabiku) writes:
-
- > In article <1k4s9t$u2@agate.berkeley.edu> rmartin@cory.Berkeley.EDU (Richard
- >
- > >I tried using the util.exe to format atari drives on an IBM PC, but
- > >it formats them in double density. Also it gives me an error:
- > >"Error formatting track 0." Can I get DOS 2.5 to recognize a
- > >double density disk? Is there a way to un-diskcomm the DOSes that
- > >are on the atari.archive so I could boot from one of these PC created
- > >double density disks?
- >
- > Hmm... let me canvass my memory for this...
- > Atari DOS 2.0 (and maybe even 1.0) has almost all the abilities to read
- > standard double density disks. Atari had this in mind, as they did
- > create an 815 (?) double density drive in the late 70s/early 80s (never
- > released, though).
-
- This is from memory (a long time ago) the locations for the FDC are
- at Hex 300 301 302 303 304 (see mapping the atari for more details).
-
- There was a nifty utility allowed you set all the parameters ie
- tracks sides sectors that you could format your disk with.
- However a bit of hand hexcoding could do it easily except I forget
- all the locations.
-
- 00 06 00 07 06 07 0a 01 00 03 0a 02 01 03 0a 0(forget the format byte)
- 02 03 and this is it if my memory of 7 years ago is correct.
-
- Happy formating ..
- > Now, in the IO control areas for DOS, there's an address that contains
- > the density byte (0 or 1). It's quite simple. From BASIC, just do a
- > POKE xxxx,1 and _voila_, the DOS will now be able to read/write double
- > density disks for the particular drive numer (the information for all the
-
-
- Jon Clarke Z*NET Pacific
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