At 04:17 �� 28/3/2002, you wrote: > > >My worry is you said that the start of (either one of?) the screen > > >memories could move while the copy/move is happening. > > > > This doesn't happen IIRC. What happens is that when a mode change occurs >the address CAN be moved (Not > > that it happens :-) (But of course Marcel would know better :-) > >This can NOT happen, on any SMS system. Screen access always has to be >implemented using the iow.xtop call (can only be in assembler or c or some >other language interface, not Sbasic) and it converts the operation into an >atomic action. Meaning that the code can not be intererrupted by changes of >screen resolution or mode or job switches which (un)cover part of the screen >etc.
So what Marcel meant is that the screen area can be moved when the system in initialised for the first time? Else the screen memory would have to be moved every time a mode change occurs? Phoebus
