Re: Source codes: overlay method

Date: Fri, 30 Jan 2015 08:35:51 +0100
Message-ID: <>
Hallo allemaal,

Again just an update. I managed to create an overlay of JiffyDOS. 
But that didn't go smooth. The sources that compiled a binary 
version were created within an hour. But creating the source code 
file was more difficult.

The working of my overlay program is based on replacing old code by 
new code by looking at the ranges of each piece of code. But JD 
makes uses of many jumps and branches to the original code. So the 
only thing that had to be added was just a label. And a label 
doesn't occupy any byte. My first idea was to place the first line 
of original code after the label. It worked but I saw it as a lazy 
work around. So the last days I only have been busy solving this 
'label only' problem. And it seems I succeeded :)

Kind regards / Met vriendelijke groet, Ruud Baltissen

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Received on 2015-01-30 08:00:04

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