4.7 MPS80 DIAGNOSTIC PROGRAM 
This program permits the user to drive the stereoviewer in terms of 
plate or ground coordinates, or to drive to a position specified in 
those units. 
A dynamic test allows the user to check the repeatability of the stages. 
Up to 10 locations in a model can be selected at a time, and after 
selection, the stereoviewer stages are continuously sent to each 
location in turn. At any time the user can halt this process and examine 
any possible ioss in repeatability at any mark. 
Another section of the program allows the user to check the commands 
which are sent between the host computer and the stereoviewer. This can 
be used to check the communication system as well as detailed 
examination of the calculations within the viewer itself. 
In general most users will have little use for the diagnostic software 
except to provide confidence in the system after it has been shipped to 
a new location, or after a change in the host computer. 
4.8 MPS90 EDIT HOST SYSTEM DATA 
To allow fiexibility in operation, the software has been designed to 
operate with different peripheral devices such as VDU's, X-Y plotters 
etc., as well as on different operating systems on the host computer. 
Changes in devices, and changes in operating systems can in general be 
handled without rebuilding the software. 
As each program starts, it checks a master file on disk to extract 
details such as the types of peripherals installed, and the current 
operating system. MPS90 is a menu driven program which allows these 
basic parameters to be set up or changed as required. 
5. SUMMARY 
The HPS-2 is a modern instrument specially designed for small format 
work. While it is low cost and small in size, its accuracy and 
performance is equal to that of many instruments in a far higher price 
bracket. Efficient use of microprocessors and sophisticated software 
have allowed a rigorous mathematical approach to the calculation 
procedures whiie allowing the use of a low cost personal computer as the 
host system, 
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