Search found 519 matches

by iss
Sat Jan 13, 2018 12:13 pm
Forum: Hardware hacks and extensions
Topic: Midi/Joystick interface?
Replies: 4
Views: 203

Re: Midi/Joystick interface?

It looks very close to the "MIDI/Minitel interface for Oric".
I think it's only MIDI and kind of serial interface, i.e. no joystick.
by iss
Fri Dec 15, 2017 11:21 pm
Forum: Technical questions
Topic: Merging video output?
Replies: 56
Views: 4670

Re: Merging video output?

20171216_000215.jpg ... and here is the short clip: https://youtu.be/W6KxqdzQLX8 What is new: I connected the SYNC output to the TAPE input (i.e. the famous VSYNC hack ;)) to filtrate H-sync pulses and left only V-sync to be used for synchronization. In the video I manually connect and disconnect t...
by iss
Fri Dec 15, 2017 5:33 pm
Forum: 6502 assembly coding
Topic: Identifying Oric-1
Replies: 3
Views: 417

Re: Identifying Oric-1

Take a look in Atmos ROM disassembly: http://www.defence-force.org/ftp/oric/documentation/v1.1_rom_disassembly.pdf There are lot places marked with V1.0 and V1.1 which show differences in both versions - most are in page 2. If the question is exactly for a zero page address then you can use $31 - Sc...
by iss
Wed Dec 13, 2017 10:52 pm
Forum: Technical questions
Topic: Merging video output?
Replies: 56
Views: 4670

Re: Merging video output?

20171213_231329.jpg This is today's best result. :) We are getting closer and closer.... For now I have the same results with extra ULA and without it, so which is better - I still don't know. About the video mixer - having an emulator for experiments and development will be really great! Else I th...
by iss
Tue Dec 12, 2017 1:21 am
Forum: Technical questions
Topic: Merging video output?
Replies: 56
Views: 4670

Re: Merging video output?

Additionally I made one quick and dirty ROM for testing. On the pictures above you see vertical lines - it's not coincidence! Attached are the sources, 4k and 2k ROM files. You can load them in Oricutron - edit 'oricutron.cfg' and set the 4k file as atmos rom or the 2k file as microdisk rom then sta...
by iss
Tue Dec 12, 2017 12:59 am
Forum: Technical questions
Topic: Merging video output?
Replies: 56
Views: 4670

Re: Merging video output?

For all impatient Oric maniacs: 20171212_010731.jpg 20171212_010900.jpg 20171212_003338.jpg ... and two short clips: https://youtu.be/2FSEukwxqn4 https://youtu.be/IO6X_84h6U0 Far far from working, but things are looking optimistic. Unfortunately I think that something on the upper board died during ...
by iss
Fri Dec 08, 2017 10:59 am
Forum: Technical questions
Topic: Merging video output?
Replies: 56
Views: 4670

Re: Merging video output?

Clipboard01.jpg Clipboard02.jpg Clipboard03.jpg Well, this are samples with the changed schematic (AND instead NAND), now the reference SYNC is BEHIND the derived SYNC's with exactly 1 full period, so no big difference and in common it doesn't matter which variant will be used. For me the important...
by iss
Thu Dec 07, 2017 8:47 pm
Forum: Technical questions
Topic: Merging video output?
Replies: 56
Views: 4670

Re: Merging video output?

@NigthBird: No, I don't think this simplification will work. After the XOR we must have NOT to invert the logic and enable the clock only when the clocks are the same . BUT , (looking again at the traces) if we change the NAND to AND (7400 -> 7408) then maybe the 1/2 cycles delay will be eliminated...
by iss
Thu Dec 07, 2017 11:27 am
Forum: Games
Topic: Blake's 7 feedback and review thread
Replies: 119
Views: 8300

Re: Blake's 7 feedback and review thread

Attached is 'Floppy.cpp' from the SVN with fixed CRC. I added missing 'compute_crc' calls where they are needed.
Floppy.cpp.zip
(8.83 KiB) Downloaded 27 times
by iss
Wed Dec 06, 2017 1:29 pm
Forum: Technical questions
Topic: Merging video output?
Replies: 56
Views: 4670

Re: Merging video output?

At end one interesting case ! Clipboard04.jpg Clipboard05.jpg Here, after power-on the reference ULA started with 60Hz but the child ULA's with 50Hz. This actually confirms that the synchronization logic works :). To not happen such case, the reference ULA should be fed with proper data to initializ...
by iss
Wed Dec 06, 2017 1:10 pm
Forum: Technical questions
Topic: Merging video output?
Replies: 56
Views: 4670

Re: Merging video output?

Clipboard02.jpg
Clipboard03.jpg
On the traces CLK, CLK1,CLK2,CLK3 are 12Mhz clocks and VSYNCH/HSYNC are visible.
You can see how the reference SYNC is 1/2 of the 12MHz period before the child's SYNCH's.
I think It's worth to sacrifice one ULA as reference.
(continue below...)
by iss
Wed Dec 06, 2017 12:40 pm
Forum: Technical questions
Topic: Merging video output?
Replies: 56
Views: 4670

Re: Merging video output?

Hello all! Below are updated schematic and test results. I think we have working synchronization :) sch.jpg 20171206_014751.jpg In short how it works: I used one ULA (U2) as reference, its SYNC signal is compared with the SYNC form a "child" ULA (U5,U6,U7), so if both SYNC's are the same then the cl...
by iss
Thu Nov 30, 2017 9:09 pm
Forum: Hardware hacks and extensions
Topic: And now, box for the controller.
Replies: 7
Views: 1415

Re: And now, box for the controller.

The Good, the Bad and the Ugly :) 20171130_213534.jpg 20171130_213704.jpg 20171130_213745.jpg I started with the right one using ABS material, but the result was extremely fragile - the supports broke before printing was finished. The left and the middle boxes are from PLA material and they are real...
by iss
Thu Nov 30, 2017 12:26 pm
Forum: Technical questions
Topic: Merging video output?
Replies: 56
Views: 4670

Re: Merging video output?

Is the printer port bi-directional? I thought it could only send data. I'm sure you know this well ;), it's bi-directional, every bit can be set independently as IN or OUT, think about the joysticks... About the RAM overlay - if it's requirement then maybe microdisc for every machine is best choice...