Springboard
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* Can switch betwen dir\name.ext and dir.name/ext

OS_File can reference special file "PCMEM:" to load/save directly
to PC's memory:

OS_File,0,  "PCMEM:",dontcare,dontcare,start addr,end addr
OS_File,255,"PCMEM:",start addr,dontcare,bufflen,dontcare
(How is PC data address specified?)

ARMINIT.EXE - TSR Tube interface software
ARM.EXE     - front-end command interpreter
ARMREG.DAT  - I/O address for Tube interface