I've updated the sun-lamp sources to the point that they should work
with NetBSD-current--for the most part.  If you get the entire -current
kernel distribution from sun-lamp (minus, perhaps, the other arch
directories), do the following (and let me know if it works ;-):

 cd ~src/sys
 mv scsi scsi.dist
 ln -s arch/mac/scsi scsi
 cp mtio.h sys  # Where mtio is the one that follows
 cd arch/mac/conf
 config.new GENERIC # If this wasn't in the dist, please let
    # me know...
 cd ../compile/GENERIC
 # Make sure that your compiler defines at least the following:
   __BSD_NET2__ mac macII __NetBSD__ mc68000 __mc68000__
   mc68020 __mc68020__
 # If not, then add them to the list of defines in the Makefile.
 setenv ARCH m68k
 make depend
 make

Hmm.  It occurs to me that you'll want some files from libc/arch/m68k,
as well:
 lib/libc/arch/m68k/DEFS.h
 lib/libc/arch/m68k/string/*
 lib/libc/arch/m68k/net/*

Cheers,
-allen

mtio.h:

/*
 * Copyright (c) 1982, 1986 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 * This product includes software developed by the University of
 * California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * from: @(#)mtio.h 7.6 (Berkeley) 2/5/91
 * $Id: mtio.h,v 1.5 1993/11/07 17:52:52 wollman Exp $
 */

#ifndef _SYS_MTIO_H_
#define _SYS_MTIO_H_ 1

/*
 * Structures and definitions for mag tape io control commands
 */

/* structure for MTIOCTOP - mag tape op command */
struct mtop {
 short mt_op;  /* operations defined below */
 daddr_t mt_count; /* how many of them */
};

/* operations */
#define MTWEOF  0 /* write an end-of-file record */
#define MTFSF  1 /* forward space file */
#define MTBSF  2 /* backward space file */
#define MTFSR  3 /* forward space record */
#define MTBSR  4 /* backward space record */
#define MTREW  5 /* rewind */
#define MTOFFL  6 /* rewind and put the drive offline */
#define MTNOP  7 /* no operation, sets status only */
#define MTCACHE  8 /* enable controller cache */
#define MTNOCACHE 9 /* disable controller cache */
#if defined(__386BSD__) || defined(__NetBSD__)

/* Set block size for device. If device is a variable size dev  */
/* a non zero parameter will change the device to a fixed block size */
/* device with block size set to that of the parameter passed in. */
/* Resetting the block size to 0 will restore the device to a variable */
/* block size device. */

#define MTSETBSIZ 10

/* Set density values for device. Thye aredefined in  the SCSI II spec */
/* and range from 0 to 0x17. Sets the value for the openned mode only */

#define MTSETDNSTY 11
#endif

/* structure for MTIOCGET - mag tape get status command */

struct mtget {
 short mt_type; /* type of magtape device */
/* the following two registers are grossly device dependent */
 short mt_dsreg; /* ``drive status'' register */
 short mt_erreg; /* ``error'' register */
/* end device-dependent registers */
 short mt_resid; /* residual count */
#if defined (__386BSD__) || defined(__NetBSD__)
 daddr_t mt_blksiz; /* presently operatin blocksize */
 daddr_t mt_density; /* presently operatin density */
 daddr_t mt_blksiz0; /* blocksize for mode 0 */
 daddr_t mt_blksiz1; /* blocksize for mode 1 */
 daddr_t mt_blksiz2; /* blocksize for mode 2 */
 daddr_t mt_blksiz3; /* blocksize for mode 3 */
 daddr_t mt_density0; /* density for mode 0 */
 daddr_t mt_density1; /* density for mode 1 */
 daddr_t mt_density2; /* density for mode 2 */
 daddr_t mt_density3; /* density for mode 3 */
#endif
/* the following two are not yet implemented */
 daddr_t mt_fileno; /* file number of current position */
 daddr_t mt_blkno; /* block number of current position */
/* end not yet implemented */
};

/*
 * Constants for mt_type byte.  These are the same
 * for controllers compatible with the types listed.
 */
#define MT_ISTS  0x01  /* TS-11 */
#define MT_ISHT  0x02  /* TM03 Massbus: TE16, TU45, TU77 */
#define MT_ISTM  0x03  /* TM11/TE10 Unibus */
#define MT_ISMT  0x04  /* TM78/TU78 Massbus */
#define MT_ISUT  0x05  /* SI TU-45 emulation on Unibus */
#define MT_ISCPC 0x06  /* SUN */
#define MT_ISAR  0x07  /* SUN */
#define MT_ISTMSCP 0x08  /* DEC TMSCP protocol (TU81, TK50) */
#define MT_ISCY  0x09  /* CCI Cipher */
#define MT_ISCT  0x0a  /* HP 1/4 tape */
#define MT_ISFHP 0x0b  /* HP 7980 1/2 tape */
#define MT_ISEXABYTE 0x0c  /* Exabyte */
#define MT_ISEXA8200 0x0c  /* Exabyte EXB-8200 */
#define MT_ISEXA8500 0x0d  /* Exabyte EXB-8500 */
#define MT_ISVIPER1 0x0e  /* Archive Viper-150 */
#define MT_ISPYTHON 0x0f  /* Archive Python (DAT) */
#define MT_ISHPDAT 0x10  /* HP 35450A DAT drive */

/* mag tape io control commands */
#define MTIOCTOP _IOW('m', 1, struct mtop) /* do a mag tape op */
#define MTIOCGET _IOR('m', 2, struct mtget) /* get tape status */
#define MTIOCIEOT _IO('m', 3)   /* ignore EOT error */
#define MTIOCEEOT _IO('m', 4)   /* enable EOT error */

#ifndef KERNEL
#define DEFTAPE "/dev/nrst0"
#endif

#ifdef KERNEL
/*
 * minor device number
 */

#define T_UNIT  003  /* unit selection */
#define T_NOREWIND 004  /* no rewind on close */
#define T_DENSEL 030  /* density select */
#define T_800BPI 000  /* select  800 bpi */
#define T_1600BPI 010  /* select 1600 bpi */
#define T_6250BPI 020  /* select 6250 bpi */
#define T_BADBPI 030  /* undefined selection */
#endif
#endif /* _SYS_MTIO_H_ */

------------------------------------------------------------------------------