|
high memory
|
|
|
address
|
contents
|
|
$EFFFFF
|
end
of VIA space
|
|
$E80000
|
beginning
of VIA space
|
|
$DFFFFF
|
end
of IWM space
|
|
$D00000
|
beginning
of IWM space
|
|
$BFFFFF
|
end
of SCC write
|
|
$B00000
|
beginning
of SCC write
|
|
$9FFFFF
|
end
of SCC read
|
|
$900000
|
beginning
of SCC read
|
|
$5FFFFF
|
end
of SCSI
|
|
$580000
|
beginning
of SCSI
|
|
$41FFFF
|
end
of ROM
|
|
$400000
|
beginning
of ROM
|
|
$3FFFFF
|
end
of RAM for 4MB Mac Plus
|
|
$27FFFF
|
end
of RAM for 2.5MB Mac Plus
|
|
$1FFFFF
|
end
of RAM for 2MB Mac Plus
|
|
$0FFFFF
|
end
of RAM for 1MB Mac Plus
|
|
varies
|
sound
buffer
|
|
varies
|
System
Error Handler area
|
|
varies
|
main
screen (ScrnBase)
|
|
varies
|
MacsBugs
(optional)
|
|
varies
|
RAM
cache (optional)
|
|
varies
|
Jump
Table (A5 relative)
|
|
varies
|
application
and QuickDraw globals (A5 relative)
|
|
varies
|
stack
(A7)
|
|
varies
|
Application
Heap (ApplZone)
|
|
$001600
|
beginning
of System Heap (SysZone)
|
|
$000E00
|
beginning
of Toolbox A-trap table
|
|
$000800
|
additional
low-memory global area
|
|
$000400
|
beginning
of OS A-trap table
|
|
$000100
|
beginning
of low-memory global area
|
|
$000000
|
beginning
of RAM
Motorola 680x0 vectors |
|
low memory
| |