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Allocation new OSWORD numbers

Make proposals here for new OSWORD calls. Give a brief outline of what you want your call to do, and an outline parameter block. Bear in mind that calls below &80 can only have up to 16 bytes control block, and calls above &7F have a defined layout that specifies the size of the control block up to a maximum of 255 bytes, and a convention has grown up that byte XY+2 and XY+3 hold command and result information.