QVME (Level E-19 Drivers onwards), SMSQ/E
This command lets you alter the size of the QL screen being displayed.
The first two parameters allow you to specify the display width in pixels and the height in lines (the normal QL display is DISP_SIZE 512,256). The remaining four parameters are those which can be set using the DISP_RATE and DISP_BLANK commands respectively. The effect of the first two parameters depends upon the system it is being used on:
Extended Mode4 Emulator
Any width up to 512 will select the standard QL resolution. Any width over 512 will select the extended resolution (768x280).
QVME, QXL and QPC
The width and height of the display can only be altered in increments of 32 pixels and 8 lines respectively. If width is not a multiple of 32 or height is not a multiple of 8, they are made into the nearest feasible size. The minimum size is 512x256 pixels.
If you try to use DISP_SIZE to specify both the line rate and the number of blank lines, the line rate is ignored and calculated according to the internal formula (see DISP_RATE).
DISP_SIZE will not work if you have already used the A_OLDSCR command.
Some combinations of Super Gold Card and AURORA may cause the internal QL clock to run too quickly unless you follow DISP_SIZE by PROT_DATE 0.
This command has no effect if your implementation of the QL does not support higher resolution displays.
Using higher resolution displays will affect the location of the start of the screen (see SCR_BASE) - using DISP_SIZE 512,256 to set the display size back to the normal QL resolution will not set the base of the screen back to 131072 (the normal screen base on a standard QL). See A_OLDSCR.
Be careful when reducing screen resolution size - windows are not resized and therefore you may not be able to see all of a program’s windows, or the SuperBASIC cursor!!