[Coco] HDBDOS - RETRIEVE FIXED!!

[Brett Gordon]

Yup.  This should work:

            fill   $39,MAGICDG+$1930-*


The -* part make lwasm calculate the number of bytes from the current
address to the MAGICDG+$1930.  Basically "*" stands for "the current
address.     If the bottom parts of the ROM gets too big, then the
result of "MAGICDG+$1930-*" becomes negative and farts out.....



On Mon, Jan 19, 2015 at 11:13 AM, Chad H <chadbh74 at hotmail.com> wrote:
> I think I understand what you are saying here.  Whereas with the "MAGICDG+$1930" it was offsetting at a fixed point, which was shifting by my adding of bytes.   Your solution of 'fill $39,MAGICDG+$1930'  would instead pad the gap so to speak and keep the Hard drive routine from moving?  This makes me want to go try again with your change and see if I can add in the extra bootup copyright string and see if it works.  I'll report back...
>
> -----Original Message-----
> From: Coco [mailto:coco-bounces at maltedmedia.com] On Behalf Of Robert Gault
> Sent: Sunday, January 18, 2015 9:26 PM
> To: CoCoList for Color Computer Enthusiasts
> Subject: Re: [Coco] HDBDOS - RETRIEVE FIXED!!
>
> Chad H wrote:
>> Yes I know right!!   I played around with that section of code ALL DAY yesterday!! You have to adjust this section every time you change the length of the code before it...
>>
>> * HARD DISK DRIVER
>>
>>                 org       MAGICDG+$193D       It all starts here!
>>
>> * Indirect Jump Table ( jsr [$MMMM] )
>>
>>                 fdb       DISKIO              universal hard disk input / output
>>                 fdb       SETUP               Setup command packet
>>                 fdb       BEEP                Make a beep sound
>>                 fdb       DSKCON2             DSKCON Re-entry
>>
>> HDBHI          fcb       $00                 HDB-DOS Offset hi-byte
>> HDBLO          fdb       $0000               HDB-DOS Offset lo-word
>>
>> PORT           fdb       DATAADDR            Interface base address
>> CCODE          fcb       TDELAY              IDE: startup delay / SCSI: wakeup delay
>>
>> That "MAGICDG" Offset, if not right, made it freeze instantly.     If you use a hex editor on the original HDBDOS.ROM file for your computer you will see at the offset they have there this long string of ff's with a data marker at that address. (ff ff ff 99 da ad da b3 ...."   It's that first 'da' that you have to find the offset of and change it beside the MAGICDG.
>
> I know what is happening but not why. The problem almost certainly is with lwtools.
> All the intermediate org statements in the program are being ignored. If you replace
>    org MAGICDG+$1930
> with
>    fill  $39,MAGICDG+$1930
> then the HDBDOS jump table and offset will always be at $D930.
>
> Given this problem, all the org sections probably should be changed to equ.
>
> Robert
>
>
>
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-- 
Brett M. Gordon,
beretta42 at gmail.com