{-----------------------------------------------------------------------+
|                                                                       |
|       "Blinkenline"                                                   |
|                                                                       |
|  A tiny program to display the system variables as pixels in the top  |
|  row and then halt the program.                                       |
|                                                                       |
|  Can be used as a stop screen for failed ROM version checks.          |
|                                                                       |
+-----------------------------------------------------------------------}

gcl0x

$100        { Load $0100 into vAC. The low byte of vAC is set to $00.     }

_vAC.       { Put the contents of the low byte of vAC ($00) at the adress }
            { pointed to by vAC ($100). This sets the page of the first   }
            { screenline to 0 (the variables page).                       }

do loop     { Halt the program.                                           }