Search found 936 matches

by kieranhj
Thu Feb 25, 2021 6:49 pm
Forum: programming
Topic: 50fps?
Replies: 18
Views: 564

Re: 50fps?

tricky wrote:
Thu Feb 25, 2021 2:43 pm
As Kieran implied, I do have a bit of a thing for 50fps, especially on a CRT, it's just so smooth :)
I was thinking you’d list out your games & conversions that run at 50Hz - probably all of them!!? :D
by kieranhj
Wed Feb 24, 2021 3:58 pm
Forum: programming
Topic: 50fps?
Replies: 18
Views: 564

Re: 50fps?

I was thinking about how to get a consistent 25fps if going for that. I thought maybe to have an IRQ on the vsync event that increments a counter. And then have the main loop of the game, once it's finished doing it stuff, polling that counter looking for the right value before waiting for the next...
by kieranhj
Wed Feb 03, 2021 10:36 pm
Forum: modern implementations of classic programming languages
Topic: MODE 7 emulation (was SAA5050 Reverse Engineering)
Replies: 43
Views: 1249

Re: MODE 7 emulation (was SAA5050 Reverse Engineering)

Soruk wrote:
Wed Feb 03, 2021 2:00 pm
guesser wrote:
Wed Feb 03, 2021 1:29 pm
Soruk wrote:
Wed Feb 03, 2021 12:00 am
the Parrot of Doom
:lol:

I shall have to adopt that name for that test :D
I can't take any credit for that, that's from scarybeasts' disc menu! :lol:
That’s my creation, sorry! :lol:
by kieranhj
Fri Jan 29, 2021 6:04 pm
Forum: past all-day virtual ABugs
Topic: All-day 'Virtual' Acorn session #11, Saturday 6th February 2021, 9am - 11pm
Replies: 54
Views: 1854

Re: All-day 'Virtual' Acorn session #11, Saturday 6th February 2021, 9am - 11pm

Hi Arcadian. Please put me down for the afternoon & evening. Thanks!
by kieranhj
Wed Jan 20, 2021 8:20 pm
Forum: new ideas wishlist & general chat
Topic: what should i write next?
Replies: 366
Views: 38620

Re: what should i write next?

Well, I think the beeb could do with more than one new shmup, and since you are going to write one anyway, you might as well start now ;) You know how much better it could be on the Master and that I will be targeting the beeb with one or two sideways RAM/ROM banks. Factor in my zero creative talen...
by kieranhj
Wed Jan 20, 2021 4:47 pm
Forum: new ideas wishlist & general chat
Topic: what should i write next?
Replies: 366
Views: 38620

Re: what should i write next?

As you’ve clearly run out of arcade ROMs to port :wink: I think the time has finally come for you to start developing that R-Type inspired sideways scrolling shmup. :D Mostly so that I don’t have to write one later. :lol:
by kieranhj
Mon Jan 18, 2021 7:51 pm
Forum: development tools
Topic: NEW! Owlet: a simple, modern BBC BASIC editor
Replies: 7
Views: 1061

Re: NEW! Owlet: a simple, modern BBC BASIC editor

Just a note that the emulator in the Owlet editor is now interactive - just click in the window! This is the ONLY way I ever want to write BASIC from now on. :D Check it out at https://bbcmic.ro.
by kieranhj
Mon Jan 18, 2021 7:45 pm
Forum: past weeknight 'developer' sessions
Topic: Weeknight 'Virtual' Dev session #9, Thursday 14th January 2021, 7pm - 10pm (GMT)
Replies: 49
Views: 1682

Re: Weeknight 'Virtual' Dev session #9, Thursday 14th January 2021, 7pm - 10pm (GMT)

Hi all, I hope the CRTC Register Masterclass session was helpful for people and apologies again for the interruption halfway through! I've sent Arcadian the PDF version of the slides to upload alongside the video when it eventually arrives. In the meantime, these are the two demo programs in BASIC: ...
by kieranhj
Wed Jan 13, 2021 5:05 pm
Forum: past weeknight 'developer' sessions
Topic: Weeknight 'Virtual' Dev session #9, Thursday 14th January 2021, 7pm - 10pm (GMT)
Replies: 49
Views: 1682

Re: Weeknight 'Virtual' Dev session #9, Thursday 14th January 2021, 7pm - 10pm (GMT)

I’m hoping my session will be closer to 30 minutes than an hour but I’ve yet to run through it all. There are some slides but want to make sure there’s more time spent on practical examples. This may or may not generate questions depending on whether I’m lecturing to the already knowledgeable! EDIT:...
by kieranhj
Sun Jan 10, 2021 8:26 pm
Forum: past weeknight 'developer' sessions
Topic: Weeknight 'Virtual' Dev session #9, Thursday 14th January 2021, 7pm - 10pm (GMT)
Replies: 49
Views: 1682

Re: Weeknight 'Virtual' Dev session #9, Thursday 14th January 2021, 7pm - 10pm (GMT)

After a few months away from the (retro) keyboard, my new year's resolution is to start on some new projects and do some more Masterclasses. To that end, I've prepared An Intro to CRTC Registers (part 1) for Thursday evening. In this session we can cover: A high-level overview of what the CRTC actua...
by kieranhj
Sat Dec 19, 2020 2:54 pm
Forum: new projects and releases: demoscene
Topic: b-tracker
Replies: 15
Views: 931

Re: b-tracker

This is great! =D> It's also been on my very long backlog, for a very long time, to write a Tracker on the Beeb - shame there wasn't one available BITD.
by kieranhj
Thu Dec 17, 2020 10:04 pm
Forum: programming
Topic: Reclaiming sound, serial, speech etc workspace
Replies: 14
Views: 637

Re: Reclaiming sound, serial, speech etc workspace

Edit to add: On a Master, this variable lives at &2CD! So this just demonstrates the pitfalls of trying to do hacky things with the OS. I would be inclined to implement your own IRQ handler and only restore the OS one when you access the disk (this may not even be necessary, but is probably rec...
by kieranhj
Thu Dec 17, 2020 11:28 am
Forum: programming
Topic: Reclaiming sound, serial, speech etc workspace
Replies: 14
Views: 637

Re: Reclaiming sound, serial, speech etc workspace

All the info you need about memory usage (and what you can feasibly steal) is here: http://mdfs.net/Docs/Comp/BBC/AllMem
by kieranhj
Sat Nov 14, 2020 12:51 pm
Forum: miscellaneous new bbc and electron games
Topic: BBC AGD Games
Replies: 23
Views: 2931

Re: BBC AGD Games

I figure I should just share this here, rather than leave it languishing on my PC. Although I'm no longer actively helping with the development of BBC AGD, I did have some success a while back converting Foggy's Quest by Dethmunk into MODE 1 to give it a bit of colour (the Spectrum version looks gor...
by kieranhj
Sat Oct 24, 2020 11:00 pm
Forum: past all-day virtual ABugs
Topic: All-day 'Virtual' Acorn session #9, Saturday 7th November 2020, 9am - 11pm
Replies: 63
Views: 8683

Re: All-day 'Virtual' Acorn session #9, Saturday 7th November 2020, 9am - 11pm

Thanks again for organising! Please put me down for the afternoon and evening. 8)
by kieranhj
Sun Oct 18, 2020 10:56 pm
Forum: new projects in development: games
Topic: BBC Pooyan
Replies: 107
Views: 7837

Re: BBC Pooyan

If you found some suitable VGM files for music then you should have come talk to us Bitshifters! Try taking a look at https://github.com/simondotm/vgm-converter and https://github.com/simondotm/vgm-player-bbc from simonm. Drop me or Simon a PM if you need any help getting it going. Keep up the good ...
by kieranhj
Fri Oct 09, 2020 4:06 pm
Forum: past weeknight 'developer' sessions
Topic: Weeknight 'Virtual' Dev session #5, Thursday 22nd October 2020, 7pm - 10pm
Replies: 37
Views: 1819

Re: Weeknight 'Virtual' Dev session #5, Thursday 22nd October 2020, 7pm - 10pm

Unfortunately (well, fortunate for me) I'm away on holiday on that Thursday. I will endeavour to attend the following session in November and maybe even see if I can get the CRTC Registers masterclass together by then.
by kieranhj
Thu Oct 08, 2020 8:45 am
Forum: past weeknight 'developer' sessions
Topic: Weeknight 'Virtual' Dev session #4, Thursday 8th October 2020, 7pm - 10pm
Replies: 15
Views: 969

Re: Weeknight 'Virtual' Dev session #4, Thursday 8th October 2020, 7pm - 10pm

Not sure I will be able to make it tonight but will pop in if I can.
by kieranhj
Wed Sep 30, 2020 7:53 pm
Forum: general
Topic: Can MODE 3 or MODE 6 display graphics?
Replies: 4
Views: 582

Re: Can MODE 3 or MODE 6 display graphics?

I understand it wouldn't look pretty with the two blank scanlines creating a dashed line effect unless I also changed the value in CTRC register 9 to 7 to remove the blank scanlines, but I wonder if anyone else has tried such a thing? If you want an equivalent of MODE 0 or 4 but with just 25 charac...
by kieranhj
Wed Sep 30, 2020 5:18 pm
Forum: new projects in development: games
Topic: Elementum - new Elk/Beeb platformer
Replies: 135
Views: 8087

Re: New Elk/Beeb platformer - playable demo

Great work, as ever! It is super-smooth and responsive. The coyote time jumping is absolutely essential and become a gameplay feature I see. If I was going to be critical then I would say that the collision detection is a bit too coarse at the moment. Would it be possible to make this pixel-perfect?...
by kieranhj
Fri Sep 25, 2020 10:28 pm
Forum: 8-bit acorn software: classic games
Topic: Acorn - A World in Pixels - new book
Replies: 53
Views: 4572

Re: Acorn - A World in Pixels - new book

What a list of contributors! And the book looks like a really high quality edition. Really looking forward to reading this. :D
by kieranhj
Thu Sep 24, 2020 10:20 am
Forum: new projects in development: games
Topic: Elementum - new Elk/Beeb platformer
Replies: 135
Views: 8087

Re: New Elk platformer - playable demo

A modified MODE 1 (256x256) on the Beeb would save 4K and you only have to inc/dec the hi byte of the screen address to switch char rows. A square MODE 1 (256x256) on the Beeb takes 16K but you still need to increment two pages to get to the next character row as there are 64 columns * 8 bytes per ...
by kieranhj
Wed Sep 23, 2020 4:43 pm
Forum: new projects in development: games
Topic: Elementum - new Elk/Beeb platformer
Replies: 135
Views: 8087

Re: New Elk platformer - playable demo

0xC0DE wrote:
Wed Sep 23, 2020 4:24 pm
Thanks for all the positive comments and suggestions for improvements. There will definitely be a Beeb version! Actually, it will be a multi-platform version that runs equally well on either system (as games should!).
Beeb version in MODE 1 maybe? :wink:
by kieranhj
Wed Sep 23, 2020 12:20 pm
Forum: past weeknight 'developer' sessions
Topic: Weeknight 'Virtual' Dev session #3, Thursday 24th September 2020, 7pm - 10pm
Replies: 35
Views: 2015

Re: Weeknight 'Virtual' Dev session #3, Thursday 24th September 2020, 7pm - 10pm

Ooops, yes, I'll be there tomorrow. No Masterclass from me this time though! (I have CRTC register programming and maybe Video ULA 101 on the backlog though.)
by kieranhj
Mon Sep 14, 2020 6:55 pm
Forum: trickysoft (new bbc micro games)
Topic: Canyon Bomber emulator/source code port without the source
Replies: 5
Views: 474

Re: Canyon Bomber emulator/source code port without the source

And again, good job with this port. It's a funny little game, that I'd also never heard of, but quite addictive once you get into it, as you say. I love the NULA version in dreary grey, very authentic! :D I think I like your MODE 1 colour choices better. Enjoyed the video again too.
by kieranhj
Mon Sep 14, 2020 6:49 pm
Forum: trickysoft (new bbc micro games)
Topic: Super Breakout emulator/source code port without the source
Replies: 3
Views: 574

Re: Super Breakout emulator/source code port without the source

So many games! You have been busy Tricky. :wink: Great work once again, and also enjoyed the video a lot hearing about your history with the game and the details of how it works. Good stuff. =D>
by kieranhj
Mon Sep 14, 2020 6:45 pm
Forum: trickysoft (new bbc micro games)
Topic: Asteroids emulator/source code port without the source
Replies: 15
Views: 1064

Re: Asteroids emulator/source code port without the source

Excellent work Tricky, as ever! And a fantastic video, really interesting to hear about the details of making the game. :)

Now, about that 6502 copro version with line drawing in MODE 0. :-k :D
by kieranhj
Mon Sep 14, 2020 6:18 pm
Forum: past weeknight 'developer' sessions
Topic: Weeknight 'Virtual' Dev session #2, Thursday 10th September 2020, 7pm - 10pm
Replies: 55
Views: 3565

Re: Weeknight 'Virtual' Dev session #2, Thursday 10th September 2020, 7pm - 10pm

I'm looking forward to catching up with some of the presentations I missed. The ones I saw were very inspiring and it's great to see people still developing for the Atom, Beeb, Electron and Archimedes. Kieran, your 'introduction to timer interrupts' was superb! I remember trying to work out this st...
by kieranhj
Fri Sep 11, 2020 10:53 am
Forum: past weeknight 'developer' sessions
Topic: Weeknight 'Virtual' Dev session #2, Thursday 10th September 2020, 7pm - 10pm
Replies: 55
Views: 3565

Re: Weeknight 'Virtual' Dev session #2, Thursday 10th September 2020, 7pm - 10pm

Nice to see everyone last night and thanks again to Arcadian for organising. I hope the Intro to Interrupts session was practical and useful. All the text and asm code can be found on GitHub: https://github.com/kieranhj/intro-to-interrupts. In the spirit of improvement, please feel free to PM me wit...

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