Search found 641 matches

by kieranhj
Fri Jun 22, 2018 11:10 am
Forum: software: classic games
Topic: Prince of Persia BBC MASTER
Replies: 2
Views: 55

Re: Prince of Persia BBC MASTER

Oh hai! :D Alas the terms of Apple II source code release on GitHub, on which the port is based, make it very clear that there can be nothing vaguely construed as commercial release, as all rights are retained by Ubisoft. That wouldn’t stop anyone from making their own “boxed copy” using an old flop...
by kieranhj
Wed Jun 20, 2018 10:24 am
Forum: software: new games
Topic: New version of Scramble for the beeb (going well)
Replies: 48
Views: 2674

Re: New version of Scramble for the beeb (going well)

Great work Tricky, it looks lovely & smooth! If only you'd been doing these conversions in the 80's you'd have much fame & fortune. :D
by kieranhj
Fri Jun 15, 2018 9:24 am
Forum: general
Topic: Which games from other platforms did you wish was on the BBC?
Replies: 22
Views: 1976

Re: Which games from other platforms did you wish was on the BBC?

trixster wrote:
Thu Jun 14, 2018 10:08 pm
If you port Stunt Car Racer to the Beeb I will write you into my Will.
I did a genuine LOL on the train this morning reading that! :lol:
by kieranhj
Thu Jun 14, 2018 3:53 pm
Forum: general
Topic: Which games from other platforms did you wish was on the BBC?
Replies: 22
Views: 1976

Re: Which games from other platforms did you wish was on the BBC?

The talk of REVS on the "Most disappointing conversions..." thread made me yearn for Stunt Car Racer . It had an original release on C64 and was recently ported to 8-bit Atari . Given that Geoff Crammond started on the BBC Micro, perhaps it's time for a conversion?! EDIT: The 6502 source code for th...
by kieranhj
Wed Jun 13, 2018 10:09 pm
Forum: software: new games
Topic: Prince of Persia
Replies: 112
Views: 4898

Re: Prince of Persia

Now, about that Beeb with shadow and sideways ram conversion....! :wink: =P~ :lol: You’d need 5x banks of SWRAM as it uses all 64K in the Master plus all of ANDY and HAZEL (minus a couple of pages for the DFS.) Actually during development I did ponder what an enhanced Master version might look like...
by kieranhj
Wed Jun 13, 2018 4:34 pm
Forum: software: new games
Topic: Prince of Persia
Replies: 112
Views: 4898

Re: Prince of Persia

Here's a quick photo.
by kieranhj
Wed Jun 13, 2018 4:04 pm
Forum: software: new games
Topic: Prince of Persia
Replies: 112
Views: 4898

Re: Prince of Persia

Just received the latest edition of Retro Gamer in the post and PoP gets a very positive (if a tad brief) review in the homebrew section :D =D> Cool. Thanks Rob. I just got home to find my copy on the door mat. They didn't warn me but nice it got a high score 94% and their "sizzler" mark! Perhaps n...
by kieranhj
Wed Jun 13, 2018 10:22 am
Forum: projects
Topic: 640x512 50 fps Bad Apple on a B... how?!
Replies: 28
Views: 839

Re: 640x512 50 fps Bad Apple on a B... how?!

Witchcraft, I tell you! :D I'm still slightly confused about one detail. The CPU is still only running at 2MHz so, even though you have a perfectly precomputed instruction stream, you've still only got 39936 cycles/frame so can write a maximum of 9984 bytes/frame which is far less than the MODE 0 sc...
by kieranhj
Fri Jun 08, 2018 3:05 pm
Forum: projects
Topic: 640x512 50 fps Bad Apple on a B... how?!
Replies: 28
Views: 839

Re: 640x512 50 fps Bad Apple on a B... how?!

Amazing work! I love the idea of someone plugging in a massive cartridge back in the 1980's and playing the Bad Apple video like this. It'd undoubtedly have been both physically massive and massively expensive as well..!! Shall we all chip in and buy Chris a decent phone to record a video on? ;) We ...
by kieranhj
Fri Jun 08, 2018 3:02 pm
Forum: off-topic
Topic: Microsoft to buy Github
Replies: 30
Views: 537

Re: Microsoft to buy Github

Who can say but I doubt that outcome personally. Skype is a consumer product that is way past its prime. GitHub is for developers and Microsoft knows that developers are a tough audience to please and difficult / impossible to advertise to. Long-term I would expect more integration points with the M...
by kieranhj
Fri Jun 08, 2018 6:59 am
Forum: off-topic
Topic: Microsoft to buy Github
Replies: 30
Views: 537

Re: Microsoft to buy Github

Disclaimer: I also work for Microsoft (not that far away from VectorEyes actually!)

I found this article to be most illuminating and from a very independent source: https://www.linuxfoundation.org/blog/mi ... -reaction/
by kieranhj
Wed Jun 06, 2018 10:51 am
Forum: emulators
Topic: Video Timing
Replies: 58
Views: 1827

Re: Video Timing

I'm still not clear as to exactly when the CRTC is comparing the Vertical Character Count against Vertical Total (R4) which I think is at the root of my issue. Is this only when VCC is incremented or cleared? My take on it is that the comparison is probably performed at the beginning of the last sc...
by kieranhj
Wed Jun 06, 2018 6:48 am
Forum: emulators
Topic: Video Timing
Replies: 58
Views: 1827

Re: Video Timing

I feel like this can also be explained by the same issue as tricky's problem, here . Have I understood right that you have a bunch of single line, single row CRTC frames (R4=0, R9=0), and then a block of rows to make the PAL frame up to 312? In the other thread, we have the observation that R4 need...
by kieranhj
Tue Jun 05, 2018 9:48 pm
Forum: emulators
Topic: Video Timing
Replies: 58
Views: 1827

Re: Video Timing

With the diversion on restoring 'normal' CRTC conditions, I think I've lost the discussion here! Kieran, can you explain again what problems you're seeing now on real hardware, compared to emulation? During the demo (and also during the transition)? Just to make sure I understand your code well eno...
by kieranhj
Tue Jun 05, 2018 10:15 am
Forum: emulators
Topic: Video Timing
Replies: 58
Views: 1827

Re: Video Timing

Would it be "safer" to add a total adjust (R5) of 8 scan lines and then change your mode in that section, with 38 rows and vsync one row earlier? If I understand what you are doing, and I might have missed it, this would make everything match as well as supporting any 6845s that don't add the extra...
by kieranhj
Mon Jun 04, 2018 5:19 pm
Forum: emulators
Topic: Video Timing
Replies: 58
Views: 1827

Re: Video Timing

I feel like this can also be explained by the same issue as tricky's problem, here . Have I understood right that you have a bunch of single line, single row CRTC frames (R4=0, R9=0), and then a block of rows to make the PAL frame up to 312? In the other thread, we have the observation that R4 need...
by kieranhj
Sun Jun 03, 2018 9:47 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG SOUTH 1 to 3 June 2018 (Hampshire) BOOKING THREAD
Replies: 125
Views: 6195

Re: ABUG SOUTH 1 to 3 June 2018 (Hampshire) BOOKING THREAD

After Leicester when we were talking about injecting code into the Tube memory window I did a proof of concept and got Bad Apple running at 640x512 (yep not 256) 50 fps in mode 0 with 2x2 ordered dithering and the Japanese version digital audio playing back at 22kHz via the Tube port... on an other...
by kieranhj
Sun Jun 03, 2018 9:39 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG Cambridge Sept 7th-9th 2018 BOOKING THREAD
Replies: 55
Views: 1319

Re: ABUG Cambridge Sept 7th-9th 2018 BOOKING THREAD

Gah! I’m not likely going to be able to make this one as it’s my father-in-law’s birthday that weekend. Will have to see nearer the time if I can make it for a day. :(
by kieranhj
Sun Jun 03, 2018 3:08 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG SOUTH 1 to 3 June 2018 (Hampshire) BOOKING THREAD
Replies: 125
Views: 6195

Re: ABUG SOUTH 1 to 3 June 2018 (Hampshire) BOOKING THREAD

Thanks for the photos everyone - looks like a great weekend! Sorry I wasn’t able to make it in the end - my short business trip to Egypt earlier in the week has left me somewhat incapacitated, I’ll just leave it at that. Amazing to see SCUMM running on a Master but I’m still intrigued as to what cmo...
by kieranhj
Thu May 31, 2018 8:13 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG SOUTH 1 to 3 June 2018 (Hampshire) BOOKING THREAD
Replies: 125
Views: 6195

Re: ABUG SOUTH 1 to 3 June 2018 (Hampshire) BOOKING THREAD

A non-sequitur, I will be attending but on Sunday only. As I’m relatively local I’m hoping to get over early doors and stay for the duration.

Look forward to seeing everyone there!
by kieranhj
Sun May 27, 2018 8:50 pm
Forum: introduce yourself
Topic: Hello
Replies: 13
Views: 305

Re: Hello

Yay! Great to have you join the forum. The 8088 MPH demo is a legendary piece of work from the last few years. One of those rare instances of genuinely new techniques being uncovered on such an old platform. I’m hoping this will mean more BBC demos (or maybe some Archie ones?!) from CRTC since it se...
by kieranhj
Sun May 27, 2018 5:46 pm
Forum: upcoming and recent events & exhibitions
Topic: NOVA 18 demoparty: 22nd - 24th June, Budleigh Salterton, Devon
Replies: 2
Views: 161

NOVA 18 demoparty: 22nd - 24th June, Budleigh Salterton, Devon

Hi all, I know it's a bit niche for many but NOVA, the only UK demoparty, is back on again down in the lovely seaside town of Budleigh Salterton in Devon, running over the weekend of 22nd to 24th June. Details and registrations can be found here: novaparty.org/ Tickets aren't a problem but recommend...
by kieranhj
Sat May 26, 2018 10:18 am
Forum: introduce yourself
Topic: Hi from London
Replies: 16
Views: 317

Re: Hi from London

A hearty welcome to the forum! Are you planning to put any of those software development skills to use in an 8 or 32-bit capacity?
by kieranhj
Thu May 17, 2018 1:37 pm
Forum: programming
Topic: BASIC 2 Commented Disassembly
Replies: 6
Views: 456

Re: BASIC 2 Commented Disassembly

Seems like this was a popular passtime in the 80's. Here's Kevin Edwards talking about it: https://twitter.com/KevEdwardsRetro/sta ... 09632?s=20
by kieranhj
Mon May 14, 2018 9:50 pm
Forum: emulators
Topic: Video Timing
Replies: 58
Views: 1827

Re: Video Timing

I feel like this can also be explained by the same issue as tricky's problem, here . Have I understood right that you have a bunch of single line, single row CRTC frames (R4=0, R9=0), and then a block of rows to make the PAL frame up to 312? In the other thread, we have the observation that R4 need...
by kieranhj
Mon May 14, 2018 5:37 pm
Forum: emulators
Topic: Video Timing
Replies: 58
Views: 1827

Re: Video Timing

This would imply that, for some 6845s, you could set R12/R13 at different scanlines within the first character row of a new frame and get a change of address midway through a row. Doesn't it? Not that this is related to your problem, but it's probably worth considering all the same, if it's true. I...
by kieranhj
Mon May 14, 2018 5:00 pm
Forum: other vintage computer hardware, software and games
Topic: Some Apple II's needing TLC at Hampshire ABUG
Replies: 11
Views: 491

Re: Some Apple II's needing TLC at Hampshire ABUG

I also have an Apple IIe that I have (shamefully :oops: ) never attempted to turn on since obtaining it from eBay. If there is going to be a small Apple II corner then I will bring this along as well, if that's OK? (This is assuming I make it to ABUG at all, it's a bit touch & go with work at the mo...
by kieranhj
Thu May 10, 2018 11:59 am
Forum: software: classic games
Topic: My final unanswered Exile question
Replies: 61
Views: 3032

Re: My final unanswered Exile question

I struggle to imagine how it could be much better than it already is. However I do have a practical suggestion, which is whether it could be ported to the 6502 second processor. This would free up a lot of memory which could be used for more sound samples perhaps? That's an interesting idea, whethe...
by kieranhj
Thu May 10, 2018 11:26 am
Forum: software: classic games
Topic: My final unanswered Exile question
Replies: 61
Views: 3032

Re: My final unanswered Exile question

If it were up to me, I'd have a separate Exile subforum! :) :D Without wanting to trigger a mega-thread, VectorEyes & I were discussing what an Exile 2 might look like, perhaps if it was Master only... or whether the original game is considered the beautiful pinnacle of 6502 game engineering (on th...
by kieranhj
Sat May 05, 2018 7:04 pm
Forum: software: new games
Topic: New version of Scramble for the beeb (going well)
Replies: 48
Views: 2674

Re: New version of Scramble for the beeb (just starting)

Looks nice and smooth Tricky, great work as always! Just so I’m clear what you’re doing here - this is 1 pixel scrolling in MODE 1 by pre-calculating all of the tile offsets in the sequence in which they appear across all of the maps? Then presumably redrawing all of the background tiles each frame ...