Patches to BASIC.CMD to work on Altair 680

Edit BASIC.CMD in a hex editor and make the following changes:

Search for |      Change to	|     Comments
-----------|--------------------|-------------------------
  A07F     |   6F7F		|  Stack location
  7000     |   6F00		|  Top of RAM
  8004     |   F000 (3 places)	|  ACIA address (status)
  8005     |   F001		|  ACIA address (data)