74. Interlacing in mode 7 ~~~~~~~~~~~~~~~~~~~~~ Having just told you that you cannot turn the interlacing off in Mode 7, here is a way of doing just that! This idea was passed on by Dave G4IAU, who thinks that it may have originated from Belfast University. It eliminates the classic Mode 7 'shake', which can be especially bad on some samples of Microvitec monitors. It is a three-part VDU23 statement. The first part turns the i/l off, and the second halves the number of scan lines per character to correct for the lack of interlacing. I stuck the final part on to halve the number of scan lines before the cursor starts, otherwise it gets lost. The commands alter registers 8,9 and 10 of the 6845 CRT controller, and this is explained on pages 364-367 of the Advanced User Guide. The command takes effect immediately, and is reset by a Mode change. It is very effective on block graphics and double-height characters, but you lose the rounding on normal-height characters, with interesting results! I/L off:- VDU23;8,144,0;0;0;23;9,9,0;0;0;23;10,105,0;0;0; I/L on :- VDU23;8,147,0;0;0;23;9,18,0;0;0;23;10,114,0;0;0;