Not only the System/390.
Its also IBM i, AIX, and for many protocols the network byte order.
AFAIK the binary data in JPG (1) and Java Class [2] files a re big endian.
And if you write down a hexadecimal number as 0x12345678 you are writing big-endian.
(1) for JPG for embedded TIFF metadata which can have both.
(1) for JPG for embedded TIFF metadata which can have both.
[2] https://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.ht...