Radio Shack TRS-80 Model 4 Owner's Manual page 392

COM/DVR
(CLEAR) and (]J, the FREE and OEVICE library commands are
executed immediately.
Error Conditions
Attempting to SET a device to the KSM/FLT when it is already active
on another device results in an error.
When you install an additional KSM, the new KSM file cannot be
larger than the first KSM file installed.
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SET *CL TO COM/DVR
Driver
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In order to use the Communications Line device (*CL), you must SET
it to this driver program.
You can use COM/OVR to prepare the Communications Line (*CL)
for use.
COM/OVR sets *CL to the RS-232C hardware.
After you SET *CL to the RS-232C hardware, you can alter the
parameters of the RS-232C port with the SETCOM command.
Example
SET *CL TO COM/DVR
sets *CL to its driver program.
SETCOM (WORD=8,PARITY=OFF)
(ENTER)
configures the RS-232C port using the values specified.
Technical Information
When you set the COM/OVR, it will be placed in high memory if there
is not enough room in low memory. (Low memory is within TRSOOS
and does not take away from the memory available for your
programs.) If this happens, a message similar to the following
appears:
Note: driver installed in high memory.
If you want to use Memdisk while you are using COM/OVR, be sure
to install Memdisk first.
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