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echo: cbm
to: Lawrence Woodman
from: Daniel Path
date: 2021-06-18 20:54:00
subject: Closing a file in Assembl

Hello Lawrence.

18 Jun 21 06:56, you wrote to you:

 LW> On Thu, 17 Jun 2021 18:56:16 -0000 (UTC), Lawrence Woodman wrote:

 >> On Thu, 17 Jun 2021 11:29:57 -0000 (UTC), Tilmann Hentze wrote:
 >>
 >>> Lawrence Woodman  wrote:
 >>>> I have created a piece of code which replicates the problem below
 >>>> if anyone has any ideas where I'm going wrong I'd be very
 >>>> grateful.
 >>>>
 >>>> [code snipped]
 >>>>
 >>>> main
 >>>>             lda  #$07         ; Length of file name
 >>>>             ldx  #>>>             ldy  #>filename   ; High byte of file name location
 >>>>             jsr  SETNAM       ; Set the name
 >>>
 >>>>             lda  #$08         ; Logical file number
 >>>>             ldx  #$08         ; Device number
 >>>>             ldy  #$01         ; Secondary address - $01 because
 >>>> saving            jsr  SETLFS       ; Set above parameters
 >>>
 >>> I'd switch the two previous blocks around, so that you first set up
 >>> the channel and then set the file name. Thanks for the suggestion.
 >>> I gave it a go but unfortunately it still
 >> gives the same result.
 >>
 >>
 >>>> [code snipped]
 >>>>             lda  #$08         ; Logical file number
 >>>>             jsr  CLOSE        ; Close the file
 >>>
 >>> Looks good to me. Perhaps it will work with the first mentioned
 >>> change? Sadly not.  However, I'm not sure that a CLOSE is necessary
 >>> as I noticed
 >> in other code examples that it isn't used.  I've tried without it
 >> and also checked for errors via a carry after the SAVE but still no
 >> joy. If you or anyone else has any ideas I'd love to get this
 >> working.


 LW> I've managed to track down the problem.  Because I was automating some
 LW> of the testing around this I hadn't left a long enough delay
 LW> before displaying the directory.  It turns out that it takes a little
 LW> longer than I expected for the SAVE command to complete the write.
 LW> Once I left a bigger delay before checking the directory everything
 LW> was fine.  It also appears that there is no need to call CLOSE either.

and what are you coding? :)

--
Daniel

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