Re: [cc65] CBM LFN Question

Hi,

thanks for the elaboration!

On Mon, Oct 25, 2010 at 11:19:11AM +0200, Spiro Trikaliotis wrote:
> The addresses for other Commodore computers are:
>
>             C64    VIC20    C128    PLUS4
> - mOPEN:   $F377   $F437   $EFDF    $EF7B
> - mCLOSE:  $F29D   $F356   $F194    $EE6B
> - mCHKIN:  $F21B   $F2D4   $F10E    $F219
> - mCHKOUT: $F25D   $F316   $F154    $ED6B

That means jumps to the kernal ROM outside of the official entry points. I'm
sure this will work, but it may also cause incompatibilities with third party
kernals (JiffyDOS, SpeedDOS, ...) or different kernal versions. The current
code for the CBM-II machines cannot access random ROM locations, only
"official" entry points are supported. I doubt that there are enough
advantages to justify the change.

Using one lfn and one table entry that is internally rewritten by the cc65
library does also need machine dependent code, but it doesn't need to jump to
arbitrary ROM locations, so this seems to be more portable to me.

Anyway: Having working opendir/readdir/closedir routines for the CBMs will
remove most needs to use CBM file I/O at all, so I see this as the preferred
way to get rid of the problem.

Regards


        Uz


-- 
Ullrich von Bassewitz                                  uz@musoftware.de
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