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06 April 2006, 19:56
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#1 |
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Posts: n/a
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Bootblock checksum
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Last edited by -Rob-; 23 June 2008 at 10:43. |
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06 April 2006, 20:16
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#2 |
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Zone Friend
Join Date: Oct 2003
Location: France
Age: 51
Posts: 161
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bootchecksum
some years ago, i done a bootblock checksum calculator to get a 4 letters word (like in Rampage/TEK boot
 ) : just add a long word at the end of the boot (if 8 bytes left) for getting good checksum valuethis version use source of the boot. perhaps can help you Last edited by bobbybearing; 06 April 2006 at 21:48. |
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17 April 2006, 01:49
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#3 |
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Registered User
Join Date: May 2005
Location: Cheshire, UK
Age: 56
Posts: 322
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Also, I always used Rossi Monitor for bootblock checksums... never needed to know how it worked, as I used Rossi Monitor to write the bootblock also!
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17 April 2006, 01:52
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#4 |
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Registered User
Join Date: May 2005
Location: Cheshire, UK
Age: 56
Posts: 322
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Actually, reading again I see that you are not talking about the bootblock checksum, more so the DOS! or other custom bootblock identifier. This isn't the checksum, the checksum is longword at ()4 from my poor 15 year old memory!
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17 April 2006, 15:39
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#5 |
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Zone Friend
Join Date: Oct 2003
Location: France
Age: 51
Posts: 161
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no, it's about the whole bootblock header (and not DOS) :
dc.b "DOS",0 ; never changed dc.b " FLA" ; .L longword checksum dc.b "SH " ; root block (normal root is $370) ... boot code" => get "DOS. FLASH ..." the checksum = " FLA" in ascii if something is changed in the code, checksum (so the word FLA) change my prog add dummy data for having right checksum " FLA" in ascii |
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17 April 2006, 15:49
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#6 |
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Posts: n/a
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Thanks for he program!
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