Utility routines: L1M

       Name: L1M                                                     [Show more]
       Type: Variable
   Category: Utility routines
    Summary: Temporary storage for the new value of the 6510 input/output port
             register
    Context: See this variable in context in the source code
 References: This variable is used as follows:
             * coffee uses L1M
             * COLD uses L1M
             * COMIRQ1 uses L1M
             * SETL1 uses L1M


.L1M

 EQUB %100              ; By default, this sets the 6510 input/output port to
                        ; the following:
                        ;
                        ;   * LORAM = 0
                        ;   * HIRAM = 0
                        ;   * CHAREN = 1
                        ;
                        ; This sets the entire 64K memory map to RAM
                        ;
                        ; See the memory map at the top of page 265 in the
                        ; Programmer's Reference Guide