Search found 389 matches

by Xeron
Thu Apr 02, 2009 2:54 pm
Forum: Technical questions
Topic: AY clock
Replies: 1
Views: 3686

AY clock

Edit: Doesn't matter, figured it out :-)
by Xeron
Thu Apr 02, 2009 10:16 am
Forum: Technical questions
Topic: Oric, cassette recorder and disk drive questions
Replies: 14
Views: 14980

Hmm ... someone needs to come up with a new interface board. You could probably do it with a microcontroller and some glue logic.
by Xeron
Tue Mar 31, 2009 7:44 pm
Forum: Emulators
Topic: Oriculator (WIP)
Replies: 74
Views: 72258

Even though its way to early, I decided to put a build of Oriculator online with some (minimal) documentation.

Please, don't report bugs or incompatibilities yet. Its too early for that :-) Just play with it and have fun...

Oriculator preview.
by Xeron
Fri Mar 27, 2009 10:34 am
Forum: Emulators
Topic: Oriculator (WIP)
Replies: 74
Views: 72258

I started the ground work for sound emulation. I put the basics in required to output sound, but since the AY emulation wasn't ready yet, I decided to mix in the (cycle exact) tape input. Result: Authentic tape noise from .TAP files :-) Not really useful, but fun :-) Of course, authentic tape noise ...
by Xeron
Thu Mar 26, 2009 7:32 pm
Forum: Emulators
Topic: Oriculator (WIP)
Replies: 74
Views: 72258

Well, i found a workaround for the inadequacies of the .TAP format when using "real" tape emulation. I insert an extra $16 at the start of the file when loading it. Then, when the motor is switched off, if the next byte is a $16, i send a load of dummy $16s when the motor is re-started. This allows ...
by Xeron
Thu Mar 26, 2009 9:50 am
Forum: Emulators
Topic: Oriculator (WIP)
Replies: 74
Views: 72258

PAL emulation: Should be possible Scaling: Sure, but only after i've added an OpenGL rendering mode, since scaling pixels 1/5th bigger would look terrible with simple scaling, and bicubic interpolation will add quite an overhead if i'm using the CPU ;-) Both things are waaaaaay down the list. First ...
by Xeron
Wed Mar 25, 2009 11:33 pm
Forum: Emulators
Topic: Oriculator (WIP)
Replies: 74
Views: 72258

:-)
Image

Image
by Xeron
Wed Mar 25, 2009 1:53 pm
Forum: Emulators
Topic: Oriculator (WIP)
Replies: 74
Views: 72258

I'm looking forward to this greatly too. The screenshot (if they are not just a mockup) look great. Actual screenshots, not mockups :-) The Debugger to (optionally) show a breakdown of AY registers(Unlike Caloric and Euphoric) Already done (although sound is still not actually emulated). The Debugg...
by Xeron
Mon Mar 23, 2009 12:45 pm
Forum: Emulators
Topic: Oriculator (WIP)
Replies: 74
Views: 72258

Oriculator (WIP)

I decided to write a new Oric emulator entirely from scratch, simply to give me something to do on the train to work :-) It is written purely in C, and uses SDL, so it will be possible to port it to loads of operating systems and devices. Every part of the emulation is written from scratch, includin...
by Xeron
Mon Mar 09, 2009 5:19 pm
Forum: 6502 assembly coding
Topic: Cycle and video timings
Replies: 6
Views: 10189

OK, thanks.

Anyone know the other answers?
by Xeron
Sun Mar 08, 2009 11:12 pm
Forum: 6502 assembly coding
Topic: Cycle and video timings
Replies: 6
Views: 10189

Cycle and video timings

I have some questions about timings in the Oric-1 and Atmos. Where there NTSC models ever released, or just PAL? When you set 60Hz mode, i presume thats a 60Hz PAL signal, rather than NTSC? How many CPU cycles are executed per raster line? Of the 312 PAL raster lines, on which line does the Oric sta...
by Xeron
Sun Mar 08, 2009 10:12 pm
Forum: 6502 assembly coding
Topic: ROM disassembly
Replies: 11
Views: 19496

Great, thanks!

My e-mail address is pete _at_ petergordon _dot_ org _dot_ uk
by Xeron
Sun Mar 08, 2009 9:36 pm
Forum: General Discussion
Topic: Reminder: #oric IRC channel on ircnet
Replies: 2
Views: 3974

I've added it to the channels I autoconnect to :-)
by Xeron
Sat Mar 07, 2009 5:22 pm
Forum: 6502 assembly coding
Topic: ROM disassembly
Replies: 11
Views: 19496

ROM disassembly

Hi

Is there a commented disassembly of the Oric Atmos (or Oric-1) ROM available online? Or do I have to try and find a copy of the Advanced User Guide?

Cheers,
Pete