07 May 2006, 00:55 | #1 |
Zone Friend
Join Date: Mar 2004
Location: Middle Earth
Age: 40
Posts: 2,130
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XCopy2 No virus Bootblock.
Hi guys I'm having trouble dissassembling the xcopy bootblock.
I've uploaded what I've done so far to the zone. What I'm trying to do is get it to run on AGA as a exe instead of a boot block. I'm mainly having trouble trying to find how much memory needs to be allocated by using blk.b in the source. I realise that you can't use blk.b on the boot block because of the 1k-Dos-Checksum-Filesystem barrier. I would like to know how big _BitMap is and also a bit more explanation with $7ee80, and how you calculated / figured it out. Thanks, should take experts hopefully less then a minute to figure it out. |
07 May 2006, 16:43 | #2 |
Going nowhere
Join Date: Oct 2001
Location: United Kingdom
Age: 50
Posts: 9,024
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I would assume that blk.b is the same as dcb.b
Copperlist = $7ee80 Bitmap, 2 colour, single plane = $7ef00 Standard lowres 2 colour single plane 320 wide, 256 height End of chip ram on a standard 512k chip ram machine is $80000 so the bitmap cannot exceed that. So $80000-$7ef00 = size of screen to allocate |
07 May 2006, 17:20 | #3 |
Zone Friend
Join Date: Aug 2005
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blk.b is a Seka directive (IMHO seka/asmone only) dcb.b is a Devpac(and other assemblers) directive. |
08 May 2006, 02:09 | #4 |
Zone Friend
Join Date: Mar 2004
Location: Middle Earth
Age: 40
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thanks for the help guys.
I'll try and rip into it again. now to leeach aga.guide |
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