N and V column

Column #120: You Can’t Touch That: Non-contact Access Control
The Nuts and Volts of BASIC Stamps (Volume 6) Page 77
' =========================================================================
'
' File....... RFID.BS1
' Purpose.... RFID Tag Reader / Simple Security System
' Author..... Jon Williams, Parallax
' E-mail..... jwilliams@parallax.com
' Started....
' Updated.... 07 FEB 2005
'
' {$STAMP BS1}
' {$PBASIC 1.0}
'
' =========================================================================
' -----[ Program Description ]---------------------------------------------
'
' Reads tags from a Parallax RFID reader and compares to known tags (stored
' in EEPROM table). If tag is found, the program will disable a lock.
' -----[ Revision History ]------------------------------------------------
' -----[ I/O Definitions ]-------------------------------------------------
SYMBOL Enable = 0 ' low = reader on
SYMBOL RX = 1 ' serial from reader
SYMBOL Latch = 2 ' lock/latch control
SYMBOL Spkr = 3 ' speaker output
' -----[ Constants ]-------------------------------------------------------
SYMBOL LastTag = 2 ' 3 tags; 0 to 2
' -----[ Variables ]-------------------------------------------------------
SYMBOL tag0 = B0 ' RFID bytes buffer
SYMBOL tag1 = B1
SYMBOL tag2 = B2
SYMBOL tag3 = B3
SYMBOL tag4 = B4
SYMBOL tag5 = B5
SYMBOL tag6 = B6
SYMBOL tag7 = B7
SYMBOL tag8 = B8
SYMBOL tag9 = B9
SYMBOL tagNum = B10 ' from EEPROM table