On 07/10/2021 15:43, tom ehlert wrote:
DISPLAY.SYS calls INT 2F.AD81h when the Code Page is changed to
inform KEYB so it can change its mapping.
please provide an example where this is necessary AND plausible.
In Poland, there were a few codepages used during the DOS era. The two
main ones were CP911 ("Mazovia") and CP852. The character mappings are
different, for instance "ą" (ALT+a) is byte 0xA5 in CP852, while in
Mazovia it is under 0x86. Most polish programs could be configured to
output their content in one of the codepages, but some were hard-coded
to either Mazovia or CP852. In such cases, a mode con cp select was
required -- in such case, a non-smart keyb driver would not be aware of
the change and keep emitting byte codes for the initial codepage it was
configured for.
Mateusz
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