Host System Values
                        ==================
                mdfs.net/Docs/Comp/Acorn/HostVals

OSBYTE0 returns what type of host you're running on. INKEY-256
(OSBYTE 129,&FF00) returns the varient of the hardware, viz:

fx0:  INKEY-256 low byte: (Varient of host system:)
error &00: BBC OS 0.10
  0   &FF: BBC OS 1.00 (full word returned=-1)
      &01: Electron
      &F9: Communicator
  1   &FF: BBC OS 1.20 (full word returned=-1)
      &FF: Acorn Business Machine OS 1.23 (full word returned=-1)
      &FE: BBC OS A1.0 (US)
      &FC: BBC OS 1.20 (Germany)
      &FA: Acorn Business Computer OS
  2   &FF: Reuters Terminal OS R0.3 (UK) (switched with *UK)
      &FE: Reuters Terminal OS R0.3 (US) (switched with *US)
      &FB: BBC B+ OS 2.00
      &FA: Acorn Business Computer OS 2.00
      &FA: Cambridge Workstation OS 2.10
  3   &FD: Master OS 3.20
  4   &F7: Master ET OS 4.00
  5   &F5: Master Compact
  6   &A0: Archimedes Arthur 1.xx
      &A1: Archimedes RISC OS 2.00
      &A2: Archimedes RISC OS 2.01
      &A3: Archimedes RISC OS 3.0x
      &A4: Archimedes RISC OS 3.1x
      &A5: Archimedes RISC OS 3.5x
      &A6: Archimedes RISC OS 3.6x
      &A7: Archimedes RISC OS 3.7x
      &A8: RISC OS 4.0x
      &A9: RISC OS 4.3x
      &AA: RISC OS 5.xx
      (ie, arm%=(INKEY-256 AND &F0)=&A0 )
  7   &AF: Springboard   (An ARM-based development system plugged into a PC)
  8   ---: UNIX-type OS
      &FE: NetBSD
      &FB: Beos
      &F9: Linux
      &F8: MacOS X
      &F7: FreeBSD
      &F6: OpenBSD
      &F5: Amiga
      &F4: GNU FreeBSD
      &F3: GNU
      &Bx: PDP11 Unix
      &B7: PDP11 Unix Version 7
      &B6: PDP11 Unix Version 6
  9      : BBC 6809/6309 system with "dir/file.ext" filesystem
      &68: 6809 system with dir/file.ext filesystem
      &63: 6309 system with dir/file.ext filesystem
 10   &F8: MacOS X
 17      : BBC 6809/6309 system with "dir.file/ext" filesystem
      &68: 6809 system with dir.file/ext filesystem
      &63: 6309 system with dir.file/ext filesystem
 28   &Cx: Commodore 64/64+/128/etc
 29   &8x: TI Calculator
 30   &Dx: Amstrad 464/664/6128, etc.
 31   &Ex: Spectrum
 32   **** DOS with Basic(86) (INKEY-256 not available)
      &57: BBC BASIC for Windows
      &FC: Windows 32 with Brandy Basic
      &FA: DOS with Brandy Basic
 39   &68: 6809 system with dir\file.ext filesystem
 39   &63: 6309 system with dir\file.ext filesystem

 --   &FE: NetBSD (Brandy Basic)
 --   &FC: Windows 32 (Brandy Basic)
 --   &FB: Beos (Brandy Basic)
 --   &FA: DOS with DJGPP DOS extender (Brandy Basic)
 --   &F9: Linux (Brandy Basic)
 --   &F8: MACOS X (Brandy Basic)
 --   &F7: FreeBSD (Brandy Basic)
 --   &F6: OpenBSD (Brandy Basic)
 --   &F5: Amiga (Brandy Basic)
 --   &F4: GNU FreeBSD (Brandy Basic)
 --   &F3: GNU (Brandy Basic)
 --   &00: RM Nimbus


NOTES
=====
Some sources quote returning X=0 with BBC B MOS 0.xx, but that's incorrect
as OSBYTE 0 always returned with an error message describing the version in
MOS 0.xx (eg "EPROM OS 0.10"), it would never return a value. BBC MOS 1.00
returned X=0

BBC BASIC 86 for DOS actually returns the character code under the cursor.
That character will be a space if the program stars by clearing the
screen, or printing to a new line with nothing already printed.

I don't know what varients OS 8 (Unix) running on RiscIX returns. I've now
got some more documents, so it may be in there.

History
=======
07-Aug-2004: Added Springboard values
07-Oct-2004: Added &57 for Windows
09-Mar-2005: Added Amiga, MacOS and more UNIX systems
12-Mar-2008: Added TI Calculator
15-May-2008: Added more Brandy Basic values, PDP11 Unix