The gray library is based on advanced IRQ handlers which quickly swap two display memory pages, thus it is subject to many limitations:

• In many cases the screen flickers (expecially on the ZX81)
• Keeping two pictures costs a lot of memory
• It heavily slows down the CPU and makes it work continously, thus disabling the “power saving” tricks and sucking up batteries on the TI calculators
• Accessing to two display pages slows down the applications comparing to the “default” B/W graphics.

Select actual gray page for the standard gfx funtions

Plot a pixel on screen

Get pixel status

Draw a line

Relative draw

Draw a box

Draw a circle

Clear map