Search found 238 matches
- Mon May 21, 2018 4:18 pm
- Forum: 6502 assembly coding
- Topic: 6502 flags C, N, Z, V and tests
- Replies: 7
- Views: 10396
Re: 6502 flags C, N, Z, V and tests
In case it helps to offer any exposition as to `CLV`, 6502s have a dedicated input pin, SO, which when asserted will s et o verflow. It's there in case the hardware design requires a low-latency polling input: CLV ; clear V in preparation to wait... .loop BVC loop ; repeat until V is set That gets y...
- Wed May 16, 2018 2:43 pm
- Forum: Emulators
- Topic: Clock Signal — an Oric emulator for macOS and Linux
- Replies: 170
- Views: 157678
Re: Clock Signal — an Oric emulator for macOS and Linux
* doesn't affect the Oric. But, essentially, nowadays if you insert a piece of media for which the correct machine or hardware configuration cannot be determined a priori, the proper machine and configuration will be found empirically. E.g. if you provide a 16kb file with a .bin extension and the e...
- Wed May 16, 2018 2:53 am
- Forum: Emulators
- Topic: Clock Signal — an Oric emulator for macOS and Linux
- Replies: 170
- Views: 157678
Re: Clock Signal — an Oric emulator for macOS and Linux
I've released a new version to GitHub . Most interesting features: Pravetz 8DOS support (read-only at present); text pasting is unbroken for the Mac port; and text pasting is faster and more accurate on both the Mac and SDL. For 8DOS, DSK or WOZ files are supported. NIBs are also implemented but I'm...
Re: JOric
(Of course, contacting MS would not hurt, if they care to answer I suspect they would confirm the hypothesis I just laid down here.) Not to mention that owning a licence does not necessarily mean owning a licence in perpetuity, or owning an assignable licence. Just as with PC-DOS, Microsoft may hav...
Re: JOric
I can't speak as to the manuals but the Commodores identify themselves as running Commodore BASIC, and although the Apple version of Microsoft BASIC is often called 'Applesoft', nothing identifying is printed at all. So I'm not sure the absence of the word Microsoft necessarily means anything. It'd ...
Re: JOric
I'm actually a bit confused about that second quote as it seems to imply that Tangerine was a company and that 'Oric' was another company rather than a product of Tangerine, which held a BASIC licence. The Register's version sounds a lot more plausible: 1983 isn't just the launch year of the Oric, i...
- Wed May 09, 2018 3:02 pm
- Forum: Games
- Topic: Wolfenstein / DOOM for Oric : has this been done?
- Replies: 118
- Views: 56034
Re: Wolfenstein / DOOM for Oric : has this been done?
Here's a longer video of the same title by somebody other than me, not implicitly about proving that they've fixed a counter placement bug: [media]https://www.youtube.com/watch?v=J203nk_OxQs[/media] It was also available with completely different graphics for the Atari 400/800/etc, with the faster p...
- Wed May 09, 2018 2:35 pm
- Forum: Technical questions
- Topic: 8DOS: overlay RAM control?
- Replies: 6
- Views: 7591
Re: 8DOS: overlay RAM control?
I tried only 130 and, from memory, probably 210; neither seemed to proceed all the way back to the BASIC prompt. But it wasn't particularly systematic testing. I guess that most likely I've messed up my implementation of 0380–0383 as all DOSes to count down and then get stuck, so maybe they're inadv...
- Wed May 09, 2018 4:05 am
- Forum: Technical questions
- Topic: 8DOS: overlay RAM control?
- Replies: 6
- Views: 7591
Re: 8DOS: overlay RAM control?
Sorry, it's a gross digression, but having attempted to implement an emulation of the scheme as above, I see as per this video; the machine hangs at the end — I can wait indefinitely and that final frame will be unchanged: [media]https://youtu.be/rRGz0Uoo9QE[/media] So my relevant follow-up question...
- Wed May 09, 2018 3:40 am
- Forum: Operating systems, utilities and other serious software
- Topic: FastBoot/FastLoad on Pravetz 8D/Disk II
- Replies: 35
- Views: 35467
Re: FastBoot/FastLoad on Pravetz 8D/Disk II
Well, the sneak preview gossip from my emulator is attached. I've not implemented any track skew, but still see the results as attached from your mapper.dsk so is it possible that Oricutron just doesn't preserve disk position when stepping tracks? i.e. each swing of the head magically resets the dis...
Re: JOric
As yet I haven't published anything on Google Play. Not sure what the approval process involves. You make it sound like it has recently changed though. There are plenty of emulators on the Google Play store with system ROMs. Has something changed recently to make those less likely to be published? ...
Re: JOric
Yeah, I've come at this whole thing from the slightly atypical direction of wanting to learn about TV standards first. So having that written, it wasn't too hard to plug the colour ROM in. I strongly suspect that the whole composite side of things is very uninteresting for most Oric users because th...
Re: JOric
If you're asking me rather than dreamseal then I'll try to answer very briefly because this answer is not about JOric: yes. RGB output travels to the GPU as RGB. Composite output is constructed from the colour ROM and then handed off and decoded from there. And other CRT-emulation steps apply. The t...
Re: JOric
I tend to adopt the mentality that each chip is sovereign, so as long as each has an interface with the same fidelity of information as the original pinout, it's sufficiently correct. That's why I care about using the actual colour ROM, because it's a knowable component, but haven't tried to deduce ...
- Mon Apr 30, 2018 7:15 pm
- Forum: Technical questions
- Topic: Merging video output?
- Replies: 86
- Views: 85875
Re: Merging video output?
Tom: You should probably read back the entire thread :) I have to admit that I find it very hard to think of what would have a relevant response to "the only difficulty become to make the four cpus start exactly at the same time" given that it's also true that "the processors are not...