1 06/12/87  mode
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 3 Syntax:  mode STR
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 5 
 6 Function:  sets the hardware mode for reading tape to STR.
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 8 
 9 Arguments:
10 STR can be one of the following modes:
11    bin
12       eight bit bytes are read in and packed (nine eight bit
13       bytes per memory double word).  This is the default mode.
14 
15    bcd
16       reads in tape that was originally written in binary coded
17       decimal (BCD).  The hardware performs input character
18       conversion.
19 
20    nine
21       eight bit bytes are read in and converted to nine bit bytes
22       by forcing the most significant bit of each nine bit byte
23       to "0"b.
24