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2668: THE 'SCANNING SCREEN$' ROUTINE
The address of this routine is derived from an offset found in the scanning function table.
Input
Output
S_SCREEN 2668 CALL S_2_COORD Check that 2 co-ordinates are given.
266B CALL NZ,S_SCRN_S Call the subroutine unless checking syntax.
266E RST $20 Then get the next character and jump back.
266F JP S_STRING
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