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   &01: Electron
  1   &FF: BBC OS 1.00/1.20 (full word returned=-1)
      &FE: BBC OS 1.10 (US)
      &FC: BBC OS 1.20 (Germany)
      &FA: Acorn Business Computer OS
  2   &FB: BBC B+ OS 2.00
      &FF: Reuters Terminal (UK) (switchable with *UK)
      &FE: Reuters Terminal (US) (switchable with *US)
      &FA: Acorn Business Computer OS
  3   &FD: Master OS 3.20
  4   &F7: Master ET OS 4.00
  5   &F5: Master Compact
  6   &A0: Archimedes Arthur 1.20
      &A1: Archimedes RISC OS 2.00
      &A2: Archimedes RISC OS 2.01
      &A3: Archimedes RISC OS 3.00
      &A4: Archimedes RISC OS 3.1x
      &A5: Archimedes RISC OS 3.50
      &A6: Archimedes RISC OS 3.60
      &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
      &F6: OpenBSD
      &F7: FreeBSD
      &F9: Linux
      &FE: NetBSD
 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
      &FA: DOS with Brandy BASIC
      &FC: Windows 32

 --   &F5: Amiga (Brandy Basic)
 --   &F8: MacOS X (Brandy Basic)
 --   &FB: Beos (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 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.

When I was putting together a system to run BBC BASIC on the Amstrad and
Spectrum, I picked 30 and 31 following on from 32.  I was intending to get
INKEY-256 to return the varient of the hardware by interrogating the
firmware somehow.  On checking the source code, the 48K Spectrum returned
&E0.

History
=======
07-Aug-04: Added Springboard values
07-Oct-04: Added &57 for Windows
09-Mar-05: Added Amiga, MacOS and more UNIX systems
12-Mar-08: Added TI Calculator