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Old 12 October 2012, 15:56   #1
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HD loader example

Hi,

I've already posted similar topic on Flashtro forums but it looks like I should've start here.

I've been trying to fix some NDOS game to load from HD. I don't want to use WHDL, since it's too
much for my A600, also it's better way to get into coding. I've already located track loader,
dumped all the files, found neccessary offsets to patch, etc. Then I got stuck. Could anyone tell
me if there's any tutorial/example how to load files from HD? I googled a bit but could't find
anything specific.
 
Old 12 October 2012, 16:14   #2
redblade
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I think dos.library isn't to friendly under _LVOForbid? Isn't that why Syndicate sometimes crashes the HD and you have to wait a while for it to revalidate itself on reboot?
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Old 12 October 2012, 16:28   #3
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This is not too trivial. At the start of your patch you need to save the "zero page" (first 1k should be enough) since important system data is stored there. Then, when you need to load from HD, you have to restore the "zero page" (it's not exactly zero page but I called it like this ever since my 64 days) and re-enable ports/timers interrupt so you can actually use dos.library for loading. If you get stuck I might attach the source for one of my old HD patches from back in the day (1996/1997).
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Old 15 October 2012, 15:52   #4
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Ok, thanks, I'll check if it works that way!
 
Old 16 October 2012, 21:56   #5
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If you do it right it'll definitely work that way.
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