I've managed to boot the latest 4.3-Quasijarus0a on Bob Supnik's SIMH VAX emulator. SIMH emulates a MicroVAX 3000, which is one of the currently supported configurations in 4.3-Quasijarus. The way I did it was: First I installed NetBSD 1.5.2/vax on the VAX emulator. I used this to label and newfs the root/usr diskimage for 4.3-Q (it is important to use the -O option to newfs so that NetBSD will create a 4.3-style filesystem. (In all cases, I used RA90 disk images, which are nice and spacious and which both netbsd and 4.3-Q seem to work well with.) Then I restored the root and usr filesystems from the 4.3-Q distribution onto these diskimages, and used the /usr/mdec/installboot command in NetBSD to install the bootblock onto the root diskimage. I created an fstab for it, and also commented out everything in rc* having to do with the network (there's no network device support in SIMH VAX yet). I also commented out all gettys listed in /etc/ttys except for console. Speaking of console, it's important to use something which is as close to a VT-100 as possible. I've been using rxvt, which is pretty good. It seems to be important to disable the RL controller ("set rl disabled" in SIMH) when booting the GENERIC kernel. Otherwise, you get a page fault and panic on boot. (I haven't tracked the cause of this down yet). The GENERIC kernel also expects there to be images on ra0, ra1 and ra2 (which are rq0, rq1 and rq1 in SIMH, respectively). I can get the system to come up in multiuser mode, and I can log in as root. Unfortunately, though, after a few seconds, the system locks up with uda0: lost interrupt uba0: reset uda0 uda0: DMA burst size set to 4 ra0: uda0, unit 0, size = 2376153 sectors Typing ^E to get to the SIMH prompt, and single-stepping the emulator shows it is stuck in the idle loop. At this point, nothing short of shutting down SIMH has any effect. Any thoughts on what might be going wrong? The complete log is included below: --Mirian KA655-B V5.3, VMB 2.7 Performing normal system tests. 40..39..38..37..36..35..34..33..32..31..30..29..28..27..26..25.. 24..23..22..21..20..19..18..17..16..15..14..13..12..11..10..09.. 08..07..06..05..04..03.. Tests completed. (BOOT/R5:0 DUA0) 2.. -DUA0 1..0.. loading boot Boot : /vmunix 327204+103384+130352 start 0x23a8 4.3 BSD Quasijarus UNIX #0: Sat Oct 2 22:15:38 CDT 1999 msokolov@luthien:/usr/src/sys/GENERIC real mem = 67076096 SYSPTSIZE limits number of buffers to 18 avail mem = 65240064 using 18 buffers containing 147456 bytes of memory MicroVAX 3000, ucode rev 6 uda0 at uba0 csr 172150 vec 774, ipl 15 uda0: version 3 model 3 uda0: DMA burst size set to 4 ra0 at uda0 slave 0: mydisk, size = 2376153 sectors ra1 at uda0 slave 1: no disk label: ra90, size = 2376153 sectors ra2 at uda0 slave 2: no disk label: ra90, size = 2376153 sectors ra3 at uda0 slave 3: floppy dz0 at uba0 csr 160100 didn't interrupt dz1 at uba0 csr 160110 didn't interrupt dz2 at uba0 csr 160120 didn't interrupt dz3 at uba0 csr 160130 didn't interrupt Changing root device to ra0a WARNING: todr too small -- CHECK AND RESET THE DATE! Automatic reboot in progress... Sun Aug 19 18:07:26 CDT 2001 /dev/ra0a: 429 files, 5504 used, 26548 free (52 frags, 3312 blocks, 0.0% fragmentation) /dev/rra0d: 2588 files, 21064 used, 968769 free (785 frags, 120998 blocks, 0..0% fragmentation) Sun Aug 19 18:07:58 CDT 2001 checking quotas: done. starting system logger preserving editor files clearing /tmp standard daemons: update cron. starting local daemons:. Sun Aug 19 18:08:01 CDT 2001 4.3 BSD UNIX (kryluk) (console) login: root Last login: Sun Aug 19 17:52:53 on console 4.3 BSD Quasijarus UNIX #0: Sat Oct 2 22:15:38 CDT 1999 Welcome to UNIX! erase ^?, kill ^U, intr ^C # uda0: lost interrupt uba0: reset uda0 uda0: DMA burst size set to 4 ra0: uda0, unit 0, size = 2376153 sectors