Re: Searching for an assembly guru -- DART disk utility

And also in "APPENDIX C Hard Disk Image Format"

On 01/21/18 12:10, Ray Arachelian wrote:
> You can check the tag bytes and other image data/features using
> lisafsh-tool: https://github.com/rayarachelian/lisafsh-tool-libdc42
>
> BLU has a different format, tags are stored with sectors, while the
> web page does not share the full details, some of the details about
> the tags are in Appendix F here:
> http://sigmasevensystems.com/blumanual.html
>
>
> On 01/21/18 10:41, David Ryskalczyk wrote:
>> I dug up a pile of Xenix disks in DART format that were imaged in
>> 1991 and they all have the format byte set as Lisa.
>>
>> My understanding is that this format byte is stored in each sector
>> header on the disk in GCR (before decoding). Maybe it would be a good
>> idea to check this? One way would be using Copy ][ Mac to look at the
>> sector header pre-decode.
>>
>> How does BLU record this format byte? Does it copy it from the sector
>> header, or does it guess based on the observed disk format?
>> It's also possible that DC42 on a Mac handles this wrong.
>>
>> David
>>
>> On Sun, Jan 21, 2018 at 10:34 AM, Ray Arachelian <ray_at_email.domain.hidden
>> <mailto:ray_at_email.domain.hidden>> wrote:
>>
>>
>>
>> On 01/21/18 09:36, Al Kossow wrote:
>> > On 1/20/18 10:35 PM, David Ryskalczyk wrote:
>> >> Not being clear there — the Lisa disk images on BitSavers are all
>> >> DC42, so I’d expect them to have a format byte of 0x12 (DC42)
>> or 0x2
>> >> (DART); not 0x02 (DC42) or 0x1 (DART, but there are no DART
>> images).
>> >
>> > I'll see if I can whip something up to check the values at 0x51 in
>> > every DC42 I've archived and see what I come up with.
>> >
>> Here you go: gcc check-dc42-format-byte.c:
>>
>> ----------- >8 cut here 8< ---------------
>> #include <stdio.h>
>> #include <stdlib.h>
>>
>> int main(int argc, char *argv[])
>> {
>>  for (int i=1; i<argc; i++)
>>  {
>>    FILE *f;
>>    unsigned char c;
>>    f=fopen(argv[i],"rb");
>>    if (!f) {fprintf(stderr,"Could not open %s ",argv[i]);
>> perror("\n"); }
>>    else
>>    {
>>      fseek(f,0x51,SEEK_SET);
>>      c=fgetc(f);
>>      printf("%s format byte @0x51: %02x\n",argv[i],c);
>>      fclose(f);
>>    }
>>  }
>> }
>>
>> ----------- >8 cut here 8< ---------------
>>
>> compile as usual: gcc check-dc42-format-byte.c -o
>> check-dc42-format-byte
>>
>> And sample output on some images off bitsavers
>>
>> $ check-dc42-format-byte *.dc42
>> 682-0073-A_Pascal_2.0_1_cpy1.dc42 format byte @0x51: 02
>> 682-0073-A_Pascal_2.0_1_cpy2.dc42 format byte @0x51: 02
>> 682-0074-A_Pascal_2.0_2_cpy1.dc42 format byte @0x51: 02
>> 682-0075-A_Pascal_2.0_3_cpy1.dc42 format byte @0x51: 02
>> 682-0075-A_Pascal_2.0_3_cpy2.dc42 format byte @0x51: 02
>> 682-0076-A_Pascal_2.0_4_cpy1.dc42 format byte @0x51: 02
>> 682-0076-A_Pascal_2.0_4_cpy2.dc42 format byte @0x51: 02
>> 682-0077-A_Pascal_2.0_5_cpy1.dc42 format byte @0x51: 02
>> 682-0077-A_Pascal_2.0_5_cpy2.dc42 format byte @0x51: 02
>> mac_supp_1.dc42 format byte @0x51: 02
>> mac_supp_2.dc42 format byte @0x51: 02
>> mac_supp_3.dc42 format byte @0x51: 02
>> ws2.0_1.dc42 format byte @0x51: 02
>> ws2.0_2.dc42 format byte @0x51: 02
>> ws2.0_3.dc42 format byte @0x51: 02
>> ws2.0_4.dc42 format byte @0x51: 02
>> label_list_for_7_7.dc42 format byte @0x51: 02
>> lisa_calendar_for_7_7.dc42 format byte @0x51: 02
>> lisa_macnosy2.55.dc42 format byte @0x51: 02
>> lisa_phone_book_for_7_7.dc42 format byte @0x51: 02
>>
>> twiggy$ check-dc42-format-byte *.dc42
>> t001_Office_System_I.dc42 format byte @0x51: 01
>> t004_Smalltalk-80.dc42 format byte @0x51: 01
>> t008_Office_System_II.dc42 format byte @0x51: 01
>> t021_Lisa_Draw.dc42 format byte @0x51: 01
>> t025_Lisa_Guide.dc42 format byte @0x51: 01
>> t044_Lisa_Project.dc42 format byte @0x51: 01
>> t046_Lisa_Write.dc42 format byte @0x51: 01
>> t058_Lisa_Graph.dc42 format byte @0x51: 01
>>
>> BTW: any reason bitsavers doesn't have Lisa Office System 3.x and
>> apps?
>>
>>
>>
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