Option (1) -- tells UNARCZ how much memory to preserve below the BDOS.  
Most Z-systems use a 2-kilobyte CPR, so preserving 8 pages is appropriate.  
Some systems may require 9 or 10 pages.  If this byte is set to zero, the 
CPR will be overwritten and a warm boot forced on exit.  The latter may be 
desirable on systems with a small TPA, or on systems with a permanently 
resident CPR, such as the SB180 running XBIOS.

Option (2) -- specifies the size in kilobytes of the disk allocation block 
used to calculate the disk space required when files in the archive are 
extracted, as shown in the archive directory display.  A zero causes UNARCZ 
to use the block size of the current default disk.  Any other value will be 
used directly as the block size (commonly 1, 2, 4, 8, or 16).  During 
extraction, the block size of the output disk is always used.

Option (3) -- is for Z-Nodes and is ignored unless the Wheel is off.  It 
determines whether screen type-out of member files in an archive is 
allowed.  When the Wheel byte is on, type-out is always allowed.

Option (4) -- sets the size of the buffer used during type-out of a member 
file.  If set to zero, all of available memory is used to buffer the file, 
but this may cause an excessive delay before type-out begins, and 
additional delays when the buffer needs to be refilled.  Setting this 
option to 1 lessens delays, but may cause excessive starting and stopping 
of floppy drive motors.  If the Wheel byte is off, this option will be 
automatically incremented to 1, if set to zero here.  If set to a non-zero 
value, the Wheel byte will have no effect.

Option (5) -- is for Z-Nodes and is ignored unless the Wheel is off.  It 
sets the number of lines of a member file that may be displayed before 
UNARCZ aborts the type-out.  If set to zero, an unlimited number of lines 
is allowed.  When the Wheel byte is on, type-out is always unlimited.

Option (6) -- determines whether UNARCZ sounds the console bell when it 
displays an error message.

Option (7) -- determines whether, during file extraction, an existing file 
of the same name in the target directory is erased without asking for 
permission first.  Whichever selection is made, the "E" command line option 
will toggle UNARCZ to the other mode.

Option (8) -- determines whether screen displays will be paged or 
continuous by default.  Whichever selection is made, the "N" command line 
option will toggle UNARCZ to the other mode.  During file extraction the 
display is never paged.