Description of video registers for:

Texas Instruments TMS9918A

Texas Instruments TMS9928A

Texas Instruments TMS9929A

Used in Texas Instruments TI-99/4A Home Computer, ColecoVision, Memotech MTX, MSX, Sega SG-1000/SC-3000, Spectravideo, Sord M5, Tatung Einstein and Tomy Tutor/Pyuuta

0	0	0	0	0	0	Bitmap Mode	External Video = 0
4K / 16K = 1	Screen Active	Interrupt Enable	Text Mode	Multicolour Mode	0	Sprite Size	Sprite Magnification
0	0	0	0	Screen Image Table Address ¸ >400 i.e. represents 0-15 multiples of 1 kB
Non-Bitmap modes: Colour Table Address ¸ >40, i.e. 0-255 multiples of 64 (not applicable in Text or Multicolour modes) Bitmap mode: MSb=0 makes colour table @V>0000, MSB=1 makes colour table @V>2000, and remaining bits become bits >6 to >C of an address mask.
0	0	0	0	0	Pattern Table Address ¸ >800 i.e. represents 0-7 multiples of 2 kB
0	Sprite Attribute Table Address ¸ >80 i.e. represents between 0 and 127 multiples of 128
0	0	0	0	0	Sprite Pattern Table Address ¸ >800 i.e. represents 0-7 multiples of 2 kB
Text Mode foreground colour				All Modes Background colour
End of Scan	Coincidence	Five Sprites	Number of Fifth Sprite, if applicable [0-31]