'''NOTES'''
1. The CRTC functionality is integrated into the CPC+ ASIC. This type exists only in the CPC464+464 Plus,CPC6128+ 6128 Plus and GX4000.
2. This type exists in "cost-down" CPC464 and CPC6128 systems. In the "cost-down" the CRTC functionality is integrated into a single ASIC IC. This ASIC is often refered to as the "Pre-ASIC" because it preceeded the CPC+ ASIC. The CRTC functionality of the Pre-ASIC is almost identical to the CRTC within the ASIC.