Date: Sun, 10 Jun 2001 20:54:58 +0100 From: Ian Dowse <iedowse@maths.tcd.ie> To: Warner Losh <imp@village.org> Cc: Mark Hittinger <bugs@freebsd.netcom.com>, hackers@FreeBSD.ORG Subject: Re: Strange request: Reading RX-50 (aka DEC Rainbow 100) disks Message-ID: <200106102054.aa51838@salmon.maths.tcd.ie> In-Reply-To: Your message of "Sun, 10 Jun 2001 12:25:04 MDT." <200106101825.f5AIP4l20899@billy-club.village.org>
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In message <200106101825.f5AIP4l20899@billy-club.village.org>, Warner Losh writ es: > >That's OK. The Rainbow disks have sectors numbered 1 through 10, for >both CP/M disks and MS-DOS disks. This makes things easier to cope >with. Great, then no driver changes are required. I've just tried it; I found a normal PC 5.25" drive, and I was able to read the DEC Rainbow boot disk I have here by doing # fdcontrol /dev/fd1 sectrac? []: 10 secsize? [2]: datalen? [0xff]: gap? [0x1b]: tracks? [80]: size? []: 800 steptrac? [1]: trans? []: 1 heads? []: 1 f_gap? [0x54]: f_inter? [1]: # hd /dev/fd1 |less Note: The `trans' values come from the 'FDC_???KBPS' #defines in fdreg.h. A value of 1 is 'FDC_300KBPS' which is different to the specs you quoted, but I think the PC standard 5.25" drive runs at 360rpm rather than 300. For a 300rpm drive you probably want a trans value of 2 (250kbps). I just left the `gap' and `f_gap' values at their defaults; I don't know the exact details of these fields, but I seem to remember that they are only used during writing and formatting, so you can ignore them for reading. >for this project. Any thumbnail about how to add a new type of drive >to fd.c? What parameters do I need for it? You could add an entry to the fd_types array in fd.c, but that requires linking the entry into a device node, so it's probably easier to just use fdcontrol. Ian To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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