=====Screen dimensions=====
By setting CRTC register settings the Amstrad's screen dimensions can be reprogrammed to match the Spectrum's.
The normal values used are R1=32, R6=24.
There are advantages to reprogramming the screen dimension to match the Spectrum's.
* The gameplay is similar because the player sees the same amount of map and there are the same number of enemies and they move in the same way.
* Graphics/levels would not need to be designed for a wider screen (e.g. in mode 1, 320 compared to 256)* For a smaller screen less memory is used for the Amstradscreen (16KB vs 12K). The memory used by the screen is the same regardless of CPC mode used. Unused areas can be used to store graphics, code and music. For a 320x200 CPC screen normally takes 16Kat &c000, but when reduced in size it takes 12K.the unused areas are: c600-c7ff, ce00-cfff, d600-d7ff, de00-dfff, e600-e7ff, ee00-efff, f600-f7ff, fe00-ffff
=====Random numbers=====