Radio Shack TRS-80 PC-3 Owner's Manual page 252

KEY OPERATION SEQUENCE
(when 2 points on the line are known)
Step No. Key Input Display Remarks
1
@:lw
X0
~_
2 50
(ENTEF!!
Y0
~_
3 50
(ENTER)
R~
4
50
(ENTER)
Xl
~_
5 -50
(ENTER)
Yl~_
6
a
(ENTER)
X2
~_
7
50
(ENTER)
Y2~_
8 100
(ENTER)
P:
0.0000 49.9999 (xP,YP)
9
(ENTER)
Q:
50.0000
100.0000
(xQ' YQ)
257