Analysis of information sources in references of the Wikipedia article "Bytecode" in English language version.
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[…] Matthias [R.] Paul […] warns that the IBM PC DOS version of the keyboard driver uses some internal procedures that are not recognized by the Microsoft driver, so, if possible, you should use the IBM versions of both KEYB.COM and KEYBOARD.SYS instead of mixing Microsoft and IBM versions […](NB. What is meant by "procedures" here are some additional bytecodes in the IBM KEYBOARD.SYS file not supported by the Microsoft version of the KEYB driver.)
[…] In fact, the format is basically the same in MS-DOS 3.3 - 8.0, PC DOS 3.3 - 2000, including Russian, Lithuanian, Chinese and Japanese issues, as well as in Windows NT, 2000, and XP […]. There are minor differences and incompatibilities, but the general format has not changed over the years. […] Some of the data entries contain normal tables […] However, most entries contain executable code interpreted by some kind of p-code interpreter at *runtime*, including conditional branches and the like. This is why the KEYB driver has such a huge memory footprint compared to table-driven keyboard drivers which can be done in 3 - 4 Kb getting the same level of function except for the interpreter. […]
{{cite newsgroup}}: CS1 maint: deprecated archival service (link)[…] Matthias [R.] Paul […] warns that the IBM PC DOS version of the keyboard driver uses some internal procedures that are not recognized by the Microsoft driver, so, if possible, you should use the IBM versions of both KEYB.COM and KEYBOARD.SYS instead of mixing Microsoft and IBM versions […](NB. What is meant by "procedures" here are some additional bytecodes in the IBM KEYBOARD.SYS file not supported by the Microsoft version of the KEYB driver.)