qdosmsq:memory:map [QDOS Internals]

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====== 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 address^To address^Usage^
|$C0000 |$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|