Chapter 4: Memory Map - Sinclair Q68 User Manual

Chapter 4: Memory Map

Below you can see the QL and the Q68 memory map as an overview about the physical hardware locati-
ons. More detailed documentation for developers is also available on request, but is not included in this
User's Manual.
Address(hex) QL
0000 0000 Internal ROM 48K
0000 BFFF
0000 C000 External ROM 16K
0000 FFFF
0001 0000 External I/O 32K
0001 7FFF
0001 8000
Internal I/O 16K
0001 8FFF
(QL registers)
0001 9000
0001 BFFF
0001 C000 External I/O 16K
0001 CFFF
0001 D000
0001 FFFF
0002 0000
Screen 0 32K
0002 7FFF
0002 8000
RAM 96K
0003 FFFF
0004 0000 Expansion RAM 512K
000B FFFF
000C 0000 Peripheral ROMs 16 x 16K
000F FFFF
0010 0000
01C0 0000
FE80 0000
FEC0 0000
FF00 0000
FFFF FFFF
Q68
ROM 96K
(Normal operation: ROM image
from SDHC card or SER.
Powerup: 4K Flash)
Internal I/O 4K
(QL registers)
Fast RAM 12K
(Powerup: 12K Flash)
Internal I/O 4K
(LED, PS/2, I²C, SER, SDHC, Sound)
Extension Bus 12K
(Ethernet and extension bus)
Screen 0 32K
RAM 28640K
(28 MB)
Screen 1 4096K
(4 MB)
Internal I/O 16384K
(Q40 compatible registers)