IBM 5150 - Page 104

If you do DEF SEG (default workspace segment):
Offset
(Hex Value) Length
Line number
of current line being executed 2E 2
Line number
of last error
347 2
Offset into segment of start of program text 30
2
Offset into segment of start of variables 358 2
(end
of program text 1-1 )
Keyboard
buffer contents 6A
1
if O-no characters in buffer
if 1-characters in buffer
Character color in graphics mode 4E 1
Set
to 1, 2, or 3 to get text in colors 1 to 3.
Do
not set to O.
(Default == 3)
Example
100 Print PEEK (&H2E) + 256*PEEK (&H2F)
L
H
~
100
Hex 64 Hex 00
I I
I
BASIC Workspace Variables
System BIOS 5-11