Acorn BBC Master 128, Service Manual

Page: 19 / 87

Master Series Service Manual
5.2 Core machine
Operation of the RAM and ROM is controlled by the Memory Controller
integrated circuit. The principal function of this device is to
control the memory paging structure.
Memory Map
The 65C12 can directly address 64K locations. As over 1/2 Mbyte may be
resident (depending on the users configuration), a paging scheme is
implemented to allow access to it.
The basic memory assignment is as follows:
Figure 1
14 Issue 1