Re: [Freedos-devel] DOS (and BIOS) references

Nice! Computer Shopper magazine (although one wonders how such a thick periodical tome could be called a "magazine" lol) used to have software called TECHHelp! back in the day containing similar information; it appears the site you mention is an online recreation of that software. Thanks for sha

[Freedos-devel] DOS (and BIOS) references

Hello, Incidentally I came across this DOS/BIOS reference (that I found cool looking) and wanted to share it with you, Tech Help! (dos4gw.org) I don't know how up-to-date it is. I know that this topic pops-up from time to time, but I haven't heard any RBIL update for quite

Re: [Freedos-devel] changing keyboard layout

No problem! The original note that Matthias Paul wrote a long time ago was very interesting, but a very long post too :) On Wed, 9 Dec 2020 at 20:43, tom ehlert wrote: > > * KEYB does not hook int 2Fh just for installation check. KEYB is > > "codepage aware", as it has produce the appropriate

Re: [Freedos-devel] changing keyboard layout

> * KEYB does not hook int 2Fh just for installation check. KEYB is > "codepage aware", as it has produce the appropriate character code > for that particular codepage (font), and that is why INT 2Fh/AD81h > exists: DISPLAY will call KEYB whenever there's a codepage change > request, so that KEYB k

Re: [Freedos-devel] changing keyboard layout

In addition to what Tom said (and regarding KEYB): * int 09 calls int 15h/4Fh is guaranteed for PC/ATs. For older keyboards where it does not happen, /9 option will hook the int9h handler to precisely add this call to the present int9h handler. * KEYB does not hook int 2Fh just for installation

Re: [Freedos-devel] changing keyboard layout

> After installing new layout and calling int 15h/4Fh manually, > causes correct scan code / ascii code pair is enqueued into the > keyboard buffer and carry flag isn't set because something is > changed this time. In short, this function is responsible for > changing keyboard layout, obviously.

[Freedos-devel] changing keyboard layout

Hi everybody, I would like to know what things are happening in the background when I change keyboard layout in FreeDOS. Normally, each time I press a key int 09 is called as a consequence of irq 1 and int 09 calls int 15h/4Fh, which has no effect when no layout is installed. So, if it is ca