XCopy2 No virus Bootblock.

[redblade]

Hi guys I'm having trouble dissassembling the xcopy bootblock. :banghead

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. :spin

[Galahad/FLT]

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

[NOB]

:agree
blk.b is a Seka directive (IMHO seka/asmone only)
dcb.b is a Devpac(and other assemblers) directive.

[redblade]

thanks for the help guys.

I'll try and rip into it again.

now to leeach aga.guide