FLEX USER MEMORY MAP
             ====================

0000 +===================+
     |                   |
     |                   |
     |                   |
     |                   |
     |       User        |
     |      Memory       |
     |                   |
     |                   |
     |                   |
     |                   |
C000 +===================+
     |    Flex system    |
C100 +===================+
     |Transient Utilities|
C700 +===================+
     |    Flex system    |
CD00 +===================+
     |System Entry Block |
CD51 +===================+
     |                   |
D400 +===================+
     |  File Management  | JSR $D406 main entry point
     |    Entry Block    |
D409 +===================+
     |                   |
DE00 +===================+
     |DiskIO Entry Block |
DE15 +===================+
     |                   |
F800 +===================+
     | BIOS Entry Block  |
F816 +-------------------+
     |       BIOS        |
FFFF +===================+