hi all,
> Could you implement >8 drives too??? The system (DOS) can handle 254 drives
> exept for one function. And this function is barely used. So drives A-Z
> should be possible...
>From where did you get the information about the 254 drives?
Have you disassembled the DOS(2) kernel????
>
> By the way, this non-supporting function is a >Dos1<-function call which
> returns a value of which every bit corresponds to a drive (1=available,
> 0=not available). But even this function can be expanded to more drives. I
> read in the official documentation that this is returned in HL and not only
> in L. Therefor, it is possible to use 16 drives with this function!!! At the
> moment H is returned 0 always, but it is preserved for more drives. So it
> should be possible to return the next 8 drives here. And the last 10
> drives... Well, those can't be detected using this function. A new function
> has to be made for support of these.
>
> This is what the manual says about it:
>
> -------------------
> 3.25 GET LOGIN VECTOR (18H)
> Parameters: C = 18H (_LOGIN)
> Results: HL = Login Vector
>
>
> This function returns a bit set in HL for each drive which is available,
> bit-0 of L corresponding to drive "A:". Up to eight drives ("A:" to "H:")
> are supported by the system currently, so register H will usually be zero on
> return.
> -------------------
>
> The rest of the functions use a drive-number with the value 0 corresponding
> to the default drive and values 1-255 corresponding to the rest of the
> drives. Other functions use 0="A:", 1="B:" etc. Depends on the type of the
> function call.
>
I think it won't be a great problem to expand driveletters to 16. But
anyway, this requires disassembly of the whole DOS2 kernel :-(
>
> ~Grauw "I have a feeling that this isn't the thing he's programming and
> talking about..."
No, he's talking about >32MB partitions on IDE-harddisks. I've mailed him
a couple of times; but as far as I've understand his work will lead to a
dead end: he is working on lowlevel sector read/write routines for IDE,
but these are already implemented in the IDE-bios of the interface of
course. He hasn't really thought of the fact what should be done next
after you can read/write sectors.
In my opinion -if you want to work with files- you'll have to modify DOS2
kernel routines (sectornumbers>#FFFF). But he doesn't want to use DOS2. So
don't expect real partitions >32MB :-(
Let's start the 32MB partition discussion again!
Greetz,
Jon
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