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README: notes about the disk copy overlays

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Joshua Bell 2018-05-07 12:43:24 -07:00
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@ -226,6 +226,14 @@ $0100 +-------------+ +-------------+
$0000 +-------------+ +-------------+ $0000 +-------------+ +-------------+
``` ```
#### Disk Copy Overlay
The Disk Copy command replaces large chunks of memory and is best The Disk Copy command replaces large chunks of memory and is best
thought of as a separate application. When exiting, the DeskTop is thought of as a separate application.
restarted from the beginning.
The first part (`ovl1.s`) loads into main memory the other overlays,
but in turn it loads a second short ($200-byte) overlay (`ovl1a.s`).
This then loads a replacement for the resources in the aux language
card area (`ovl1b.s`) and another block of code in main memory
(`ovl1c.s`). When exiting, the DeskTop is restarted from the
beginning.