I found this a pretty good way to help beginners in programming - also it was _very_ fast - In fact I programmed an 'editor' Apple II wich used exactly the same way than on the ZX. After entering a keyword that takes parameters, like Print or Go To the Keyword Cursor [K] changes for the Character Cursor [C] and you just enter what ever you want. It will stay this until New Line is pressed. And with some trick you could even use keywords within printed strings so save RAM "LET HERCULES GO TO HELL" is just a 14 Byte string instead of 22 (Send GATES instead of HERCULES will save another 3 Bytes). Just try the folowing program: 10 for i = 1 to 255 20 print chr$(i); 30 next i This worked only because the CPU was interpreting (!) the 'video' memory and took the representation of a byte from the character 'generator' for toggeling the brightnes. If encountering a Basic Token inside the screen buffer the keyword was generated. The Video buffer itself was kind of trickey, since it is only a dynamic buffer - a strem to be interpreted for display - for every line only as much chars as needed where stored with an newline as termination, directly followed by the next line - so an empty screen just consits of 16 newlines. AFAIR Basic Memory was growing from the bottom and screen memory from the top, with variable storage inbetween. this could lees so an out of memory abortion if to much was printed onscreen. The CPU based video display is also the reason for the SLOW and FAST modi - in FAST the CPU uses all HighRes graphics are also possible via assembler subroutiens - just stop the ROM routine and generate your own signal - up to 300x578 interlaced could be possible - just without a structured display memory (witch needs an expansion) the generatable resolution will be more like 200x578. Possible to have 2K (just unsolder the 2114s and put in a 6116), Standard RAM expansion of 16K, but third party modules of 64 and more K, Additional I/O modules, even floppies have been made. The ZX80 is not 100% compatible. Gruss Hans -- Ich denke, also bin ich, also gut HRK