The DZT:90x120°can be used as 
plotting machines, 
. manually operazed plotting table for the preparation 
Of map sheets and for drawing simple sketches, and 
. off-line system feeding on data supplied by magnetic 
tape Or external computer, 
. On-line plotting table in connection with all Jena 
Ag part of the CASP system, the DZT is operated in the 
last-named mode. 
Ai-M16 Microcomputer 
The Ai-M46 microcomputer of Ai Electronics Corp., Japan, 
has 2 word lenzth of.16 hit and an internal gtorazs 
capacity of 512 EK byte, Peripheral memory units include 
a 75 M.byte hard dise drive and.a 1.M byte.flOoppy dise 
drive, The dialog with the system is conducted through 
an alphanumerioal keyboard and a CRT display unit. 
Digitizer 
The digitizer made by Mutoh Engineering, Japan, has a 
table size of 1000 mm x 1200 mm, It has an areal measuring 
system with a resolution of 0.025 mm, Measurement and 
digitization of the drawing are by moving a cursor, 
Interface box 
The interface box, Dil: by Sankel Engineering, Japan, 
links the measuring machine to the computer. It has four 
coordinate counters with preselector switches and digital 
displays. Data transfer to the microcomputer is released 
with a pedal switch. An additional keyboard is provided 
Por entering frequently recurring commands into the com- 
puter, Fig. 3 shows view of the system hardware. 
Software 
Below, the graphics software of the CASP system is described 
by its program commands and data structure, Programs are 
available in PASIC and TORTRAN 77 languages, 
Program commands 
1, Plotting eommands 
During plotting, the Operator has several modes at his 
command: 
P Plotting of points, marking by symbols or alpha-numeric 
lettering 
I Straight-line connection of points measured 
T Plotting of curves; drafting tool synchronously follows 
floating mark movements 
M Generation of about 3,500 Chinese, Japanese or Latin 
characters 
ON Orientation of plotting table, i. e. transformation 
from model to map coordinate Syst en 
D Deletion 
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