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versions.txt
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2002-09-02
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733b
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18 lines
i HAVE NOT ATTEMPTED TO ASSIGN EITHER CONTROLLER rom TO EITHER
VERSION OF dos. tHERE IS NO CLEAR INDICATION OF WHICH WAS
FIRST OR THAT EITHER SET OF dos rom'S REQUIRES A PARTICULAR
cONTROLLER rom. tHERE ARE ONLY 3 SIGNIFICANT DIFFERENCES
BETWEEN THE CONTROLLER rom'S:
1) tHE CHECKSUM BYTE IS JUST BEFORE THE 2 VECTORS AT THE END
OF THE rom IN REV. a, AND THE FIRST BYTE IN THE rom IN
REV. b.
2) tHERE ARE 2 BYTES ADDED BEGINNING AT LOCATION 140 IN THE
REV. b rom.
3) tHERE ARE 24 BYTES ADDED BEGINNING AT LOCATION 880 IN THE
REV. b rom.
tHE CODE WAS RECOMPILED WITH THESE CHANGES AND THERE ARE NO
SIGNS OF PATCHES. aLL THE OTHER DIFFERENCES APPEAR TO BE THE
RESULT OF ADDRESS CHANGES FROM THE RECOMPILATION.