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

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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