Radoslaw,
A 24-bit program using fullword (24-bit) addresses in a variable length
parameter list will have the high-order bit on in the last such address.
This bit is ignored in addressing modes less than 64-bit. It is
significant in 64-bit mode, placing the address in the "dead zone".
A hasty conversion to 64-bit mode will expose this problem. It may be
that the interrupt handler for references to the dead zone strips the
bit and redrives the failing instruction, but I don't know.
Those with more specific knowledge are welcome to jump in.
Steve
R.S. wrote:
Just curious: how S/360 *24-bit* programs could have problems with
memory between 2-4G ???
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