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Add a new flag, -f, which allows independently fixing or trashing checksums.

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This commit is contained in:
Anthony J. Bentley
2018-03-10 21:48:23 -07:00
parent f86dbafad0
commit 5a4bbe4985
2 changed files with 63 additions and 15 deletions
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33
src/fix/rgbfix.1
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@@ -14,6 +14,7 @@
.Sh SYNOPSIS
.Nm rgbfix
.Op Fl CcjsVv
.Op Fl f Ar fix_spec
.Op Fl i Ar game_id
.Op Fl k Ar licensee_str
.Op Fl l Ar licensee_id
@@ -46,6 +47,30 @@ If both this and the
flag are set,
.Fl C
takes precedence.
.It Fl f Ar fix_spec
Fix certain header values that the Game Boy checks for correctness.
Alternatively, intentionally trash these values by writing their binary inverse
instead.
.Ar fix_spec
is a string containing any combination of the following characters:
.Pp
.Bl -tag -compact -width xx
.It Cm l
Fix the Nintendo logo
.Pq Ad 0x104 Ns \(en Ns Ad 0x133 .
.It Cm L
Trash the Nintendo logo.
.It Cm h
Fix the header checksum
.Pq Ad 0x14D .
.It Cm H
Trash the header checksum.
.It Cm g
Fix the global checksum
.Pq Ad 0x14E Ns \(en Ns Ad 0x14F .
.It Cm G
Trash the global checksum.
.El
.It Fl i Ar game_id
Set the game ID string
.Pq Ad 0x13F Ns \(en Ns Ad 0x142
@@ -104,12 +129,8 @@ overlapping portion of the title.
.It Fl V
Print the version of the program and exit.
.It Fl v
Validate the header and fix checksums: the Nintendo character area
.Pq Ad 0x104 Ns \(en Ns Ad 0x133 ,
the header checksum
.Pq Ad 0x14D ,
and the global checksum
.Pq Ad 0x14E Ns \(en Ns Ad 0x14F .
Equivalent to
.Fl f Cm lhg .
.El
.Sh EXAMPLES
Most values in the ROM header are only cosmetic.