K 10
svn:author
V 7
git2svn
K 8
svn:date
V 27
2021-10-08T01:19:34.805145Z
K 7
svn:log
V 369
Use symbolic names for int13 calls

For all the INT13 calls, use symbolic names instead of magic numbers. This makes
it easier to understand what the code is doing w/o a trip to google to find what
these numbers mean.

(cherry picked from commit 7f5499972e115cafc861ec438cd7237422cd9b7c)

Git Hash:   01791287987664b5db4a362dc817f7081553aca2
Git Author: imp@FreeBSD.org
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