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

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> 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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