* bug in debug
@ 2003-01-04 11:09 Jan Willem Stumpel
0 siblings, 0 replies; only message in thread
From: Jan Willem Stumpel @ 2003-01-04 11:09 UTC (permalink / raw)
To: linux-msdos
Freedos:
C:\>debug
=a100
0900:0100 repe scasb
0900:0102 repne scasb
0900:0104
=u100
0900:0100 F3AE REPE SCASB
0900:0102 F2AE REPE SCASB
MS-DOS 6.00:
C:\>debug
-a100
0A91:0100 repe scasb
0A91:0102 repne scasb
0A91:0104
-u100
0A91:0100 F3 REPZ
0A91:0101 AE SCASB
0A91:0102 F2 REPNZ
0A91:0103 AE SCASB
The opcodes F3 and F2 are disassembled by Freedos's DEBUG as if
they are the same. Found this by accident while trying to find out
why Sidekick does not load under Freedos. The reason for that,
apparently, is that Sidekick expects an INT 28 instruction
somewhere in the segment that holds the INDOS flag, and Freedos
doesn't have that. In the location where MS-DOS has INT 28,
Freedos has INT E6. Don't know what that means of course.
Regards, Jan
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