NetBSD 0.9a
From Computer History Wiki
All the evidence I can find is this...
NetBSD 0.9a (GOBOU) #0: Thu Nov 4 01:22:49 JST 1993 ukai@nasu:/a/teto/proj/NetBSD/current-1993.10.25/usr/src/sys/arch/i386/compile/GENERICAHA CPU: i486DX (486-class CPU) real mem = 16773120 avail mem = 14360576 using 230 buffers containing 942080 bytes of memory pc0 at 0x60-0x6f irq 1 on isa pc0: color com0 at 0x3f8-0x3ff irq 4 on isa com1 at 0x2f8-0x2ff irq 3 on isa lpa0 at 0x378-0x37f on isa wdc0 at 0x1f0-0x1f7 irq 14 on isa wd0 at wdc0 targ 0: 116MB 762 cyl, 8 head, 39 sec <Conner Peripherals 120MB - CP30104H> fdc0 at 0x3f0-0x3f7 irq 6 drq 2 on isa fd0 at fdc0 targ 0: 1.44MB 80 cyl, 2 head, 18 sec fd1 at fdc0 targ 1: 1.2MB 80 cyl, 2 head, 15 sec aha0 at 0x330-0x337 irq 11 drq 5 on isa aha0: bus speed 250ns aha0 targ 0 lun 0: type 0(direct) fixed <CONNER CP3100-100mb-3.50610> SCSI1 sd0 at aha0 targ 0 lun 0: 100MB 776 cyl, 8 head, 33 sec, 512 byte/sec aha0 targ 6 lun 0: type 5(ro) removable <SONY CD-ROM CDU-8001 3.2i> SCSI1 cd0 at aha0 targ 6 lun 0: loaded ne0 at 0x300-0x30f irq 9 on isa ne0: ne2000 ethernet address 08:00:17:03:65:0b npx0 at 0xf0-0xff on isa npx0: using exception 16 biomask 4840 ttymask 1a netmask 200 impmask 21a
And it's from here...
From what I can also fine, NetBSD 0.9a introduced shared libraries, and also depreciated all the __386BSD__ compiler tags.