In honor of the current high-level debate comparing MS and
the mac, I suggest returning to basics, specifically, the
First Edition of the IBM PC Technical Reference Manual (1981).
 
Turning to the glossary section we learn:
 
"ALPHANUMERIC: Pertaining to a character set that contains
letters, digits, and usually other characters, such as
punctuation marks."
 
And although "DSR: Data Set Ready, associated with modem
control."
 
We are advised that "DTR: Distribution Tape Reel."
 
Not only that but ...
 
"EPROM or PROM: ... is actually Read-Only Memory (ROM) but
the contents may be changed ..."
 
"K: ... to the tenth power."
 
"MNEMONIC: ... Usually has two or three letters."
 
"SCAN LINE: The use of cathode beam to test the cathode
ray tube of a display used with a personal computer."
 
"TEXT: In ASCII, a sequence of characters treated as an
entity if preceded and terminated by one STX and one
ETX transmission control respectively."