Window Scrolls Improve your arcade games with a machine code routine which enables you to scroll part of the screen in four different directions. Window Scrolls by Pete Cooke of Leicester allows you to emulate professional programmers and simulate windows on the Spectrum. The routine occupies 217 bytes in all and is stored in locations starting at 30000, so it will fit into a 16K Spectrum. If you have a 48K machine you should change the addresses to a higher value if you intend to write a long program. To use the routine as it is written, you should first define the size of the window by changing the numbers POKED in lines 120 to 150. At present the routine sets up a window 25 pixels by 50. To control the scrolling, use the cursor keys. A game written using the program would thus be controlled by the cursor keys.