How to load ADVENT on PDP-8?

[Robert Armstrong]

> Since nobody (including me, the developer) seems to have the original 
> RALF-format source files for OS/8 ADVENT, you've got to be careful to 
> replicate the environment used to build the .SV file. Normally, the 
> ADVENT.SV assumes that the files are stored on SYS: ...

  ADVENT uses overlays (most FORTRAN programs did) and, although it isn't
well documented, overlaid programs must be run from the SYS: device.  It's
because the overlay code assumes that the device handler for the overlay
file is resident and it can't load it if it isn't.  A device that's
co-resident with SYS: should also work.  

  There's some more information about running ADVENTure on the WinEight
simulator here:

	http://www.sparetimegizmos.com/Hardware/SBC6120_Adventure.htm

Bob