Search found 2701 matches

by Dbug
Thu Feb 02, 2006 12:59 pm
Forum: Operating systems
Topic: DSK file format description
Replies: 4
Views: 9967

DSK file format description

I was trying to figure out how to patch DSK files, and then I checked the Tap2Dsk tool that seem to work with a simple format: - a 'imageheader' of 256 bytes, followed by 'n' sectors of 256 bytes. With this I would just have to put the Jasmin boot in DSK+256, the MicrodiscBoot at DSK+512, and the fa...
by Dbug
Thu Feb 02, 2006 12:40 pm
Forum: Operating systems
Topic: Jasmin boot sequence and disc structure.
Replies: 6
Views: 11772

Both the microdisc controller and the jasmin controller have electronics to control the MAP and ROMDIS signals on the expansion port. This allows them to switch between the BASIC rom, the overlay ram, and an eprom that reads the OS from the floppy disk. Ok. So even if the way of doing it is differe...
by Dbug
Tue Jan 31, 2006 11:55 pm
Forum: Operating systems
Topic: Stratsed/Sedoric differences ?
Replies: 4
Views: 12634

Stratsed/Sedoric differences ?

Does anyone know the differences between a Sedoric and a Stratsed disc ?

Are the boot sequences similar ?
by Dbug
Tue Jan 31, 2006 11:53 pm
Forum: Operating systems
Topic: Sedoric disc structure ???
Replies: 3
Views: 8395

Ok from reading various documents, I figured out that Sedoric contains mostly two kind of data: - Stuff to be recognised as an Oric Dos disc, and thus getting the microdisc eprom to boot the disc. - Sedoric data itself. It seems that for the Oric Dos compatibility sedoric uses the 3 first sectors of...
by Dbug
Tue Jan 31, 2006 10:14 pm
Forum: Operating systems
Topic: Jasmin boot sequence and disc structure.
Replies: 6
Views: 11772

Jasmin boot sequence and disc structure.

When writing my long post about the basis of a new mini os, I was wondering about how the Jasmin was actually working. I know that instead of having like on the microdisc a dedicated boot sequence where the disc rom takes control of everything when you switch on the system, on the Jasmin you have a ...
by Dbug
Tue Jan 31, 2006 10:10 pm
Forum: Operating systems
Topic: Sedoric disc structure ???
Replies: 3
Views: 8395

Sedoric disc structure ???

Could somebody give me a description of how the Sedoric discs are organised, where is the directory, boot sector, system files, sector allocation tables, etc...

Or at least point me on some page with the informations :)

Thanks.
by Dbug
Tue Jan 31, 2006 12:00 am
Forum: Operating systems
Topic: Let's talk about a Mini-DOS
Replies: 6
Views: 12402

Let's talk about a Mini-DOS

In these last years, I've been talking with a number of people that had (like me) some large scale projects on the Oric. Some wanted to port games, some wanted to port applications, some wanted to create demos. The common point of all these projects is that they use the floppy disc drive, the other ...
by Dbug
Sun Jan 29, 2006 10:53 pm
Forum: Technical questions
Topic: Bigger capacity disc idea
Replies: 7
Views: 9528

Except that I think that since the rotation (relatively to the head position) is faster the farther you got from the center, I fear that the pulses to read and write are getting longer and longer. (longer "bits") ?
by Dbug
Thu Jan 26, 2006 11:54 pm
Forum: Technical questions
Topic: Implications of playing Music during a Disc Load
Replies: 2
Views: 5033

My own idea is to actually consider the problem on a track by track basis. At maximum we have 18 sectors to load in a track. And the loading of these sectors are critical. The track change is not that important. The idea is to have the replay routine to not actually sent data to the PSG, but instead...
by Dbug
Wed Jan 25, 2006 10:06 pm
Forum: Cross development tools
Topic: Porting OSDK
Replies: 8
Views: 10810

The thing you need to ask there though is the targetting. If you have no intention in supporting an operating system which died it's death around 1998 then you will need to keep the filenames in the 8.3 format. However, if you want a platform independent fix, you need to ditch dos and move on. Unde...
by Dbug
Tue Jan 24, 2006 9:43 am
Forum: Tape and floppy disk converters
Topic: Disk tools.
Replies: 6
Views: 11749

Hum, is not nibble found on some old operating system master disks ?
I have no idea about what is BDDisk thus :-/
by Dbug
Mon Jan 23, 2006 10:09 pm
Forum: Cross development tools
Topic: Porting OSDK
Replies: 8
Views: 10810

Wouldn't it make more sense to follow the set up of the system (for instance, binaries in /usr/bin and libs in /usr/local/lib for Linux or in Program Files for Win32)? Well, it makes sense, but it is not necessarily practical or even suitable. The first thing to consider, is that half of the tools ...
by Dbug
Mon Jan 23, 2006 9:45 pm
Forum: General Discussion
Topic: here I am
Replies: 5
Views: 6622

Well, now that you are back, perhaps can you tell us what you became during all that long time without earing of you :)
by Dbug
Mon Jan 23, 2006 9:31 pm
Forum: General Discussion
Topic: htp://forum.oric.org ?
Replies: 4
Views: 7965

Well, I would have loved to get forums on oric.org, but if I decided to put them on my own server, it's because the sad truth is that Oric.org has not been update for ages... And if there is something to fix, I can do it her. I have no power of any kind on oric.org Anyway, if you need to remeber, ju...
by Dbug
Mon Jan 23, 2006 9:19 pm
Forum: 6502 assembly coding
Topic: IRQ interupt
Replies: 23
Views: 27330

Salut Hi Il n'y a aucun registre sur l'oric permettanr de savoir où se trouve la position du balayage. On peut bidouiller (hardware) entre la prise K7 et la prise péritel pour obtenir l'information, mais ca n'est évidement pas disponible en standard. There is no register on the oric to know where th...