Changes

Type 0

|-

|0||0||Select internal 6845 register||Write Only

Type 1

|-

|0||0||Select internal 6845 register||Write Only

Type 2

|-

|0||0||Select internal 6845 register||Write Only

Type 3 and 4

|-

|0||0||Select internal 6845 register||Write Only

On CRTCs 3/4, only the 3 least significant bits of the selected register number are considered to read a register according to the following table:

|-

|0||R16||Light Pen Address (High)

The cursor raster registers R10/R11 act as status registers when read on CRTCs 3/4. They behave as normal cursor raster registers upon write.

! R10 - Bit number

! Bit value

|}

! R11 - Bit number

! Bit value