qdosmsq:memory:map

Memory Map

The original QDOS memory map is shown below. This is still valid on the old black boxes, but Trump Cards, Gold Cards, Super Gold Cards, Aurora etc may/will have changed things about. I currently have no information on these devices so I cannot document them here. I have requested details using the QL newsgroup and as information arrives, I shall add it here.

From addressTo addressUsage
$C0000 $FFFFF Peripheral ROMS - up to 16 each a maximum of 16Kb in size.
$40000 $BFFFF Expansion RAM up to 512 KB.
$30000 $3FFFF Remainder of original 128Kb RAM
$28000 $2FFFF System variables & screen 2 - total 32K
$20000 $27FFF Screen 1 - 32 Kb
$1C000 $1FFFF External I/O
$18000 $1BFFF Internal I/O
$10000 $17FFF External I/O
$0C000 $0FFFF External ROM slot - 16Kb
$00000 $0BFFF Internal 48K ROM
  • qdosmsq/memory/map.txt
  • Last modified: 2008/03/17 16:19
  • by norman