1220 
MONITORING 
8 Channel Monitor 
Scope with 
Figure 2. — Functional drawing of the Master Monitor Console located in the monitor mezzanine. Automatic monitor- 
ing of all animals will be controlled from this console. 
COMPUTER SYSTEM 
The computer is important for performing 
the automatic monitoring of the animals; but, 
in addition, it must be able to perform other 
functions. Therefore, a time-sharing system 
was set up. 
The real-time, time-sharing system is based 
on the MEDLAB System developed by Warner 
and associates'-*-^ at the Latter-Day Saints' 
Hospital in Salt Lake City. There are signifi- 
cant differences between these systems, how- 
ever, because the computer that is used by 
UBTL is a sixteen-bit computer, has less in- 
struction capability, and also has a rather so- 
phisticated I/O mechanism which allows I/O to 
be carried out independent of the central proc- 
essing unit (CPU) operation. Also, the AHTF 
basic monitoring requirements are much more 
variable since each device tested will require a 
different set of parameters to be analyzed. 
The core memory of the computer is broken 
down as shown in Figure 3. At lower core is the 
real-time batch monitor system (REM) which 
is provided by the computer manufacturer. 
Next to this is the Utah Time-Sharing Execu- 
tive (UTE) which is the executive that pro- 
vides us with the real-time, time-sharing func- 
tion and is the subject of this discussion. A 
section is devoted to the AUTOMON program, 
which carries out the automatic monitoring of 
the animals. There is a "User Area," and at 
the present time, this area is divided into three 
2K segments. All of these areas are located in 
the foreground section of memory and are thus 
under the control of the real-time interrupts. 
While the computer has a priority interrupt 
scheme, it is used to little advantage because 
