== Overview ==
== Programming the CRTC ==
The 6845 Cathode Ray Tube Controller (CRTC)
Introduction
The 6845 Cathode Ray Tube Controller (CRTC) is a programmable IC used to generate video displays. This IC is used in a variety of computers including the Amstrad CPC, Amstrad CPC+ and KC Compact.
4. As far as I know, the KC compact used HD6845S only.
The 6845 is selected when bit 14 of the I/O port address is set to "0". Bit 1 and 0 of the I/O port address define the function to access. The remaining bits can be any value, but it is adviseable to set these to "1" to avoid conflict with other devices in the system.
==Programming==