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- ; mailbox.inc - fixed test mailbox shared by the compiler, generated
- ; programs, and the x128 harness. Protocol: docs/memory-map.md.
- ;
- ; The mailbox is in bank 0 inside bottom common RAM, so it is readable and
- ; writable from every Nova128 mapping and from the VICE monitor after exit.
-
- .ifndef MAILBOX_INC
- MAILBOX_INC = 1
-
- MB_BASE = $1BF0
- MB_MAGIC0 = MB_BASE + 0 ; 'N' ($4E) once the mailbox is initialized
- MB_MAGIC1 = MB_BASE + 1 ; '8' ($38)
- MB_PRODUCER = MB_BASE + 2 ; who wrote it (MB_PROD_*)
- MB_STATUS = MB_BASE + 3 ; MB_ST_*
- MB_CODE = MB_BASE + 4 ; 2 bytes LE: diagnostic/fault/check code
- MB_ADDR = MB_BASE + 6 ; 2 bytes LE: fault or check address
- MB_DATA = MB_BASE + 8 ; 8 bytes producer-defined payload
- MB_SIZE = 16
-
- MB_MAGIC0_VALUE = $4E
- MB_MAGIC1_VALUE = $38
-
- MB_PROD_PLATFORM = $01 ; platform probe/skeleton
- MB_PROD_COMPILER = $02 ; N128C
- MB_PROD_PROGRAM = $03 ; generated Nova128 program
-
- MB_ST_RUNNING = $01 ; written first; still set => hung or crashed
- MB_ST_PASS = $A5
- MB_ST_FAIL = $FA
-
- .endif
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