Memory Map; Add-On Ability; Sideways Roms - AMSTRAD CPC464 User Manual

3 RED
4 MAGENTA
5 MAUVE
6 BRIGHT RED
7 PURPLE
8 BRIGHT MAGENTA
9 GREEN
10 CYAN
11 SKY BLUE
12 YELLOW

1.4) Memory Map

The 64K of RAM is allocated as follows.
Note that part of the ROM overlays the screen RAM, thereby releasing the maximum possible area
to user RAM during BASIC operations.
ROM SECTION 0 <
ROM SECTION 1 <
When there is both RAM and ROM at an address, then READING accesses the ROM and WRITING
accesses the RAM. Either ROM section can be turned off,allowing read access to the RAM at the
same address.

1.5) Add-on ability

1.5.1) Sideways ROMS

Provision is made for additional ROMS to be selected in place of any part of the on-board ROM. The
address arbitration and bank selection logic will be contained in a module connected to the
expansion bus, but all the signals required are brought to the expansion bus.
16 PINK
17 PASTEL MAGENTA
18 BRIGHT GREEN
19 SEA GREEN
20 BRIGHT CYAN
21 LIME GREEN
22 PASTEL GREEN
23 PASTEL CYAN
24 BRIGHT YELLOW
25 PASTEL YELLOW
26 BRIGHT WHITE
0000H
3FFFH
4000H
7FFFH
8000H
BFFFH
C000H
> RAM [Screen 3]
FFFFH