Re: use of BLOAD and BSAVE

[Rubywand <rubywand@swbell.net>]

Bernard Esteban writes ...
> 
> Hi,
> 
> I need to make copy of binary file from a 5"1/4 to a 5"1/4 (I have only
> one floppy drive),
> 
> Could you help me :
> What is the best adress for BLOAD ?
> How to find, to know the lengh of the binary file loaded, because it
> does'n work with a bad lengh ?
> 
> PS : I dont have the possibility to use another commands than DOS3.3's
> cmd.
 ....

     You can get BLOAD address and length info about a file by BLOADing it
and PEEKing at a few addresses.

BLOAD Address is in two bytes: $AA72 (43634 decimal) is lo byte
                               $AA73 (43635 decimal) is hi byte

BLOAD Length is in two bytes:  $AA60 (43616 decimal) is lo byte
                               $AA61 (43617 decimal) is hi byte

After a BLOAD you can enter

PRINT PEEK(43634) + PEEK(43635) 
to get the BLOAD address.

PRINT PEEK(43616) + 256*PEEK(43617)
to get the length.



Hers's an example:

BLOAD NARFBIN

PRINT PEEK(43634) + PEEK(43635)
8192  (this is the answer for the above)

PRINT PEEK(43616) + 256*PEEK(43617)
8184  (this is the answer for the above)

BLOAD address for NARFBIN is 8192 ($2000 in hex)
Length of NARFBIN is 8184 bytes ($1FF8 in hex)



Rubywand