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#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. ![]() |
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#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 |
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#3 |
Zone Friend
Join Date: Aug 2005
Location: Germany
Age: 52
Posts: 424
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![]() blk.b is a Seka directive (IMHO seka/asmone only) dcb.b is a Devpac(and other assemblers) directive. |
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#4 |
Zone Friend
Join Date: Mar 2004
Location: Middle Earth
Age: 40
Posts: 2,130
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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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