This is commonly used by games to provide one moving area of the display (usually the play field) and one static (usually a status display).
Motorola | Motorola 68040 | Motorola 68000 | Motorola 68030 | Motorola 68000 family | Motorola 6800 | Motorola Envoy | Motorola Canopy | Motorola 6809 | Motorola 68020 | Motorola StarTAC | Motorola Razr3 | Motorola phone AT commands | Motorola i870 | Motorola DynaTAC | Motorola Droid | Motorola Devour | Motorola Atrix | Motorola 88000 | Motorola 6845 | Motorola 68060 | Motorola 68010 |
Chipset: In addition to the Z80 and 6502, the system also included Intel 8255A PIO, Intel 8251A USART, Intel 8214 Programmable Interrupt Controller, Motorola 6845 CRT controller, Western Digital 1793 floppy disk controller, and OKI MSM5832 real time clock.