names for various supported machines.

* 386-linux: 386 or 486 running linux
* 386-bsd:  386 or 486 running bsd
* dec3100:  Decstation 3100,5000, OS=Ultrix V3.1C-0 (Rev. 42) [akcl 505]
            ULTRIX V4.2 (Rev. 96)[akcl 602] (VOL= )  
* hp300-bsd:  Hp 350, 370 [motorola 68K]  under 4.3 BSD (mt xinu)
* hp300:  Hp 350, 370 under HPUX.
* hp800:  Hp 720,730 under HPUX (version 8).  Possibly hp 800 also
* mac2:  Macintosh under AUX (unix) 
* mp386: intel 386 under System V 3 (eg microport,interactive)
* NeXT: NeXTStep 2.1 Motorola 68030,68040.
* ncr: intel 386 under System V 4 (loader sfasl not done).
* ps2_aix: ibm ps2 under aix
* rios: Ibm risc 6000 under aix3.
* rt_aix: ibm rt under aix release 2.
* sgi4d: 4d silicon graphics (IRIX System V Release 3.3.1)[akcl 600]
* sgi: silicon graphics 3d versions
* sun3-os4: sun3 under os 4.03, 4.1, 4.1.1
* sun3:  Sun 3 (motorola 68K)  Sun OS  3.5
* sun4:  Sun 4,(sparc) sparctations,  sun os 4.03, 4.1, or 4.1.1
* solaris: Sun 4,(sparc) sparctations,  sun os 5 (solaris)
* symmetry: sequent symmetry (386 chips) DYNIX-3.0.12+
* u370: IBM 370 (3090's) under AIX
* vax: Vax under 4.3 bsd., also ultrix