![[img]](../img/z88.gif)
| Z80 BBC BASIC for the Sinclair Z88 |
Technical Information
In its Z88 incarnation, BASIC occupies a memory map in the following form:
$C000 - $FFFF BBC BASIC interpreter
$4000 - $BFFF (additional 32K of program/workspace, expanded Z88)
$2000 - $3FFF BASIC program/workspace
$0000 - $1FFF Operating system use (and occasional application stack)
Memory is fixed at the bottom and variable at the top. BASIC workspace
occupies &2000 to &22FF. PAGE starts at &2300.
BASIC's program/workspace is arranged in the following manner:
+-------------------+ $FFFF
| BASIC interpreter |
. .
. .
HIMEM +-------------------+ $BFFF or $3FFF
| Stack |
+-------------------+ Current limit of the stack
. . (Stack expands downwards)
. Unused memory .
. .
+-------------------+ Current limit of the heap
| Heap | (Heap expands upwards)
LOMEM +-------------------+
. .
. .
TOP +-------------------+
| Program |
PAGE +-------------------+ $2300
| Workspace for |
| interpreter |
+-------------------+ $2000
| Operating system |
| system usage |
+-------------------+ $0000
When BASIC is swapped out, then unused memory above the end of the heap and
below the stack is used by other applications. When BASIC is returned to
its contents may have changed.
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Authored by J.G.Harston
- Last update: 20-Aug-2003