Search found 1425 matches

by Symoon
Sun Jan 06, 2019 10:20 am
Forum: General Discussion
Topic: PC to Oric 3.5" floppy
Replies: 27
Views: 7418

Re: PC to Oric 3.5" floppy

Hey thanks.
Yesterday I almost fried another PC trying to use a 3" drive on it, and this morning my old Microdisc (master) for a real Oric doesn't seem to work anymore.

I think I'm cursed with disks :cry:
by Symoon
Sun Jan 06, 2019 10:15 am
Forum: Hardware hacks and extensions
Topic: re microdisc floppy controller board
Replies: 9
Views: 1028

Re: re microdisc floppy controller board

I don't think Oric DOS can handle 80 tracks? As far as I know only Sedoric 2.1 (modified by Ray McLaughlin) and onwards can.
(well, maybe Randos or other Stratsed can, but not sure... And the most common nowadays is Sedoric)
by Symoon
Sun Jan 06, 2019 10:00 am
Forum: Tape and floppy disk converters
Topic: Track reading (Sedoric / FDC)
Replies: 51
Views: 29922

Re: Track reading (Sedoric / FDC)

Thanks. I suspect the differences are with the user available tracks (would the system be present on the disk or not).
Or maybe small differences betwenn the (apparently) many different FTDOS versions.
by Symoon
Sat Jan 05, 2019 7:41 pm
Forum: General Discussion
Topic: PC to Oric 3.5" floppy
Replies: 27
Views: 7418

Re: PC to Oric 3.5" floppy

I have an Amstrad CPC 664 which came with a bunch of 3 inch disks. Most of them are unreadable, some give random read errors... but I can format and copy new data and they work quite reliably. Maybe time simply did its job and damaged the data on them... :? Or maybe there's a problematic speed gap ...
by Symoon
Sat Jan 05, 2019 7:40 pm
Forum: General Discussion
Topic: PC to Oric 3.5" floppy
Replies: 27
Views: 7418

Re: PC to Oric 3.5" floppy

Thanks, but I'm just trying to read a bunch of old 3" disks ;) I'm afraid they haven't been stored in good conditions :( And before that, I had to face so many problems with my old PCs that it seemed to be a joke (fried PC, fried USB ports, dying 3.5" floppy (used to transfer files), unexpected star...
by Symoon
Sat Jan 05, 2019 7:32 pm
Forum: Tape and floppy disk converters
Topic: Track reading (Sedoric / FDC)
Replies: 51
Views: 29922

Re: Track reading (Sedoric / FDC)

Interestingly, Omniflop lists 4 different formats for Jasmin:
40x17 340kB
41x17 348.5kB
42x17 357kB
They have been provided by Chloé so I suspect I should ask for details on the other forum!
by Symoon
Sat Jan 05, 2019 5:25 pm
Forum: General Discussion
Topic: PC to Oric 3.5" floppy
Replies: 27
Views: 7418

Re: PC to Oric 3.5" floppy

Tried Omniflop today, no success with a Jasmin disk.

Anyway, although I have five 3" drives and four PCs able to connect them, I ususally get a disk transfer failure of around 90-95%.
Each time I try, feels like a higway to hell. And ends in hell indeed.
by Symoon
Sat Jan 05, 2019 3:49 pm
Forum: Tape and floppy disk converters
Topic: Track reading (Sedoric / FDC)
Replies: 51
Views: 29922

Re: Track reading (Sedoric / FDC)

Hey thanks a lot, very valuable information ;)
by Symoon
Fri Jan 04, 2019 10:33 pm
Forum: Tape and floppy disk converters
Topic: Track reading (Sedoric / FDC)
Replies: 51
Views: 29922

Re: Track reading (Sedoric / FDC)

Stupid question but I still don't find the information: does anyone know where (if?) the disk format informations are stored on a FTDOS (Jasmin) disk? Maybe it's not stored at all... I seem to recall someone saying that it was always double sided, 41 tracks and 17 sectors, but I don't find back wher...
by Symoon
Thu Jan 03, 2019 9:06 pm
Forum: Tape and floppy disk converters
Topic: Old tapes-analysis and convertion to text
Replies: 9
Views: 372

Re: Old tapes-analysis and convertion to text

About speed, Orics have (more or less) a 20% tolerance to speed variations. The Oric ROM actually tests time between two transitions, as being shorter or longer than 512µs; remember short sinusoids are (normally) 416µs long, and longer ones are 624 or 832µs long. So I think the speed variation you m...
by Symoon
Wed Jan 02, 2019 11:43 pm
Forum: Tape and floppy disk converters
Topic: Old tapes-analysis and convertion to text
Replies: 9
Views: 372

Re: Old tapes-analysis and convertion to text

You're welcome, glad if it can help in any way. As promised, here are Fabrice's explanations from long ago: So, as you already know, the Oric can save *FAST* at 2400 bauds, this is what we read in manuals. However, don't mistake bauds for "bits per second". If the Oric could save 2400 bits per seco...
by Symoon
Tue Jan 01, 2019 9:35 pm
Forum: Tape and floppy disk converters
Topic: Old tapes-analysis and convertion to text
Replies: 9
Views: 372

Re: Old tapes-analysis and convertion to text

I will try to answer but I suspect you have electronic skills that I don't have ;) If I understand correctly wherever the synch sequence starts on the tape( sometimes the signal is faded very low and increases) but the synch sequence ends with 111 then restarts with start bit 0, then data ( MSB firs...
by Symoon
Tue Jan 01, 2019 9:14 am
Forum: Tape and floppy disk converters
Topic: Old tapes-analysis and convertion to text
Replies: 9
Views: 372

Re: Old tapes-analysis and convertion to text

Hi there, The easiest way if you want to make TAP files, could be to post your (unmodified) 44kHz WAV files somewhere so I could take a look at them and try converting them. There are no miracles to expect but with experience, somethimes old Oric users manage to make things better ;) To answer your ...
by Symoon
Tue Jan 01, 2019 7:51 am
Forum: General Discussion
Topic: Happy New Year 2019
Replies: 6
Views: 169

Re: Happy New Year 2019

Happy new year to all!
by Symoon
Sun Dec 23, 2018 7:11 am
Forum: 6502 assembly coding
Topic: How to create random number with machine code?
Replies: 4
Views: 212

Re: How to create random number with machine code?

Short reply (sorry, in a hurry): I would read the timer's low byte and keep the 2 lower bits from it. Something like LDA $0308 then any other instruction to set the 6 bits to 0, giving 000000xy (than would probably be AND #$03 but please double check, I have to leave now ;) ) then A = 0, 1, 2 or 3. ...