Search found 850 matches

by kieranhj
Tue Mar 24, 2020 10:00 pm
Forum: introduce yourself
Topic: Hello from Hampshire
Replies: 24
Views: 535

Re: Hello from Hampshire

Yes, sorry, the file loading mechanism for Prince of Persia is a bit convoluted. It loads sectors directly from the disc in drive 0 so you can’t *COPY the files or run from a different drive I’m afraid. This was all because I needed ~50 catalogue entries but also wanted to fit everything on a single...
by kieranhj
Fri Mar 20, 2020 5:43 pm
Forum: hardware
Topic: VideoNuLA and 6845 questions
Replies: 13
Views: 416

Re: VideoNuLA and 6845 questions

I am trying to understand "rupture" smooth vertical scrolling. I've seen some useful info on an Amstrad CPC464 forum, but would appreciate if anyone could check my understanding of a typical use case: - divide screen into 3 vertical regions: - 1 at top, small, static - 2 in middle, large, smooth (a...
by kieranhj
Wed Mar 18, 2020 8:31 pm
Forum: programming
Topic: zero page addresses help please
Replies: 14
Views: 587

Re: zero page addresses help please

The other thing to note is that very few vars need to be zero page. Obviously anything that’s using an indirected load/store through a pointer has to be in ZP and anything that’s in tight inner loops, like counters, would be advised. But if you’re only touching the var once per frame, or even less, ...
by kieranhj
Fri Mar 13, 2020 3:33 pm
Forum: programming
Topic: 6845 Shenanigans
Replies: 5
Views: 413

Re: 6845 Shenanigans

Welcome to the wonderful world of CRTC register abuse! It is a lot of fun. :D jsBeeb is by far and away the most accurate emulator when it comes to display timing but you should find both b2 and b-em are very good and sufficient for your experiments, unless you’re getting down to needing to update r...
by kieranhj
Thu Mar 12, 2020 8:42 pm
Forum: software: new games
Topic: Prince of Persia
Replies: 136
Views: 12489

Re: Prince of Persia

Just completed this - still astounded that you got it to run on a BBC Master! I'd only played the first level before on an Atari ST (I think). It's amazing how many neat little touches there are across the 12 levels considering it's an 8 bit game. The Mode 2 graphics add a certain charm that I thin...
by kieranhj
Fri Jan 31, 2020 7:05 pm
Forum: software
Topic: Modern development environment for Archimedes
Replies: 3
Views: 412

Modern development environment for Archimedes

Hey all, I've recently started dabbling in some ARM development again, as a change from several years of 6502, targeting the 'classic era' Archimedes machines, so A310 through A5000, but mostly focused on A30x0 as a standard configuration. I thought I'd start a thread on setting up a modern developm...
by kieranhj
Fri Jan 31, 2020 9:21 am
Forum: upcoming and recent events & exhibitions
Topic: BBC Micro Lives at ROUGOL / Mon 17th Feb 2020
Replies: 11
Views: 762

Re: BBC Micro Lives at ROUGOL / Mon 17th Feb 2020

Doh! I really wanted to come along to this one to support Jason and chip-in with some of my own BBC exploits. Alas it falls during the school half-term holidays so my wife has already booked us to be away for a long weekend. #-o I look forward to hearing how it goes and what the RISCOS folks make of...
by kieranhj
Sat Jan 18, 2020 5:22 pm
Forum: wanted
Topic: Wanted: A3000
Replies: 2
Views: 221

Re: Wanted: A3000

I have an A3020 already so looking for an A3000 at this time.
by kieranhj
Sat Jan 18, 2020 4:51 pm
Forum: wanted
Topic: Wanted: A3000
Replies: 2
Views: 221

Wanted: A3000

Hello all, I’m interested in acquiring an A3000 for software development purposes. I am happy to pay a fair, but not excessive, price depending on configuration of RAM/HDD etc. Only requirement is that the machine is in full working order and the motherboard is demonstrably free of battery damage (c...
by kieranhj
Sun Jan 12, 2020 4:57 pm
Forum: software: classic games
Topic: Electron Elite disk image.
Replies: 14
Views: 710

Re: Electron Elite disk image.

Elite typically did have anti-tampering CRC protection in a number of places.

I made a buildable disassembly of the BBC cassette version of Elite (probably the closest to the Electron version) which you can find on GitHub here: https://github.com/kieranhj/elite-beebasm
by kieranhj
Mon Jan 06, 2020 9:23 pm
Forum: general
Topic: Today I received.....
Replies: 5703
Views: 490527

Re: Today I received.....

Maybe 2020 is the year of ‘next gen’...? :wink:
by kieranhj
Sat Jan 04, 2020 7:36 pm
Forum: general
Topic: Post pictures of your beeb setup
Replies: 229
Views: 31179

Re: Post pictures of your beeb setup

I found some time over the holidays to get my office set back up. I have managed to squeeze in 9 machines (not including the laptop) that can be used with only a modicum of cable shuffling. I’m on a bit of a ‘next gen’ trip for 2020 hence the Atari ST, Amiga and Archie. Of course it’ll all get destr...
by kieranhj
Fri Dec 27, 2019 10:39 pm
Forum: general
Topic: 363C Lecture: The Ultimate Acorn Archimedes talk
Replies: 3
Views: 409

Re: 363C Lecture: The Ultimate Acorn Archimedes talk

I saw this mentioned on Twitter but didn’t have a link to the media for the talk itself, so thank you for posting that! Looking forward to watching it soon. 8)
by kieranhj
Fri Dec 27, 2019 5:35 pm
Forum: projects
Topic: Bouncing Basketball tech demo on the Acorn Electron
Replies: 40
Views: 1470

Re: Bouncing Basketball tech demo on the Acorn Electron

=D> You’re just showing off now. :wink:

Any chance of an ssd now I’ve got my Elk set up with an SD64 plz?

Looking forward to what you come up with next and maybe a full length demo for NOVA2020...?
by kieranhj
Fri Dec 27, 2019 5:19 pm
Forum: software
Topic: New demo - Horizon
Replies: 11
Views: 1838

Re: New demo - Horizon

Thanks for doing a write up Sarah, this is really interesting. It’s been so long since I did any ARM, I naively assumed there would be no need for lots of unrolled code but clearly I’m completely wrong! I think I managed a 4x4 pixel rotozoomer but that was my limit BITD. There are a ton of awesome e...
by kieranhj
Sat Dec 14, 2019 11:40 pm
Forum: software: other
Topic: Merry Christmas from Bitshifters!
Replies: 10
Views: 751

Re: Merry Christmas from Bitshifters!

IIRC many of the effects are done by changing the palette at the right moment. Can this be done on a FPGAtom, now that we have 64 colours and an eight MHz cpu core? This one has no fancy palette switching or CRTC tricks - at 2MHz there’s just enough time to move 64 3x3 pixel blocks independently. S...
by kieranhj
Sat Dec 14, 2019 10:34 pm
Forum: software: other
Topic: Merry Christmas from Bitshifters!
Replies: 10
Views: 751

Re: Merry Christmas from Bitshifters!

:shock: :shock: Absolutely nuts! Such smooth animation. Brilliant! =D> =D> Btw, unlike the older version on the Bitshifters website, the latest version of JSBeeb enables sound on iOS: https://bbc.godbolt.org/?disc=https://bitshifters.github.io/content/bs-xmas-19.ssd&autoboot&model=Master :idea: Tha...
by kieranhj
Sat Dec 14, 2019 10:04 pm
Forum: software: other
Topic: Merry Christmas from Bitshifters!
Replies: 10
Views: 751

Merry Christmas from Bitshifters!

bs-xmas-19.png
A festive greeting from Bitshifters for your BBC Micro!
https://bitshifters.github.io/posts/pro ... as-19.html
by kieranhj
Sat Dec 14, 2019 12:21 am
Forum: projects
Topic: The well known Bad Apple demo on the Acorn Electron
Replies: 19
Views: 1091

Re: The well known Bad Apple demo on the Acorn Electron

Amazing work! Love the high-res scanline look. =D>
by kieranhj
Sun Dec 08, 2019 1:27 pm
Forum: software
Topic: New demo - Horizon
Replies: 11
Views: 1838

Re: New demo - Horizon

A great excuse for me to set my office back up after all the unplugging for ABUG! I’ll see if I can make a decent video capture from real hardware at some point too.
by kieranhj
Sun Dec 08, 2019 12:14 am
Forum: software: other
Topic: BooBip RTool 1.04 released
Replies: 13
Views: 603

Re: BooBip RTool 1.3b released

All but the earliest versions should work with higher PAGE - which one were you using Kieran? I regularly use ADFS and DFS with RT1.02 and that was fine :? Whichever one I got with my EEPROM. :) My B is still in a box after last ABUG but I’ll check when I set it all back up (hopefully tomorrow) and...
by kieranhj
Sun Dec 08, 2019 12:07 am
Forum: software: other
Topic: BooBip RTool 1.04 released
Replies: 13
Views: 603

Re: BooBip RTool 1.3b released

Thanks for the update! Any chance of a version that can cope with PAGE a bit > &1900 please? Several times I accidentally loaded two FS ROMs into my EEPROM so PAGE ended up ~&1B00. After that I get a ‘No Room’ error when trying to update ROM slots, which makes it a bit painful to correct my mistake.
by kieranhj
Sat Nov 30, 2019 1:08 am
Forum: upcoming and recent events & exhibitions
Topic: ABUG SOUTH 24 to 26 January 2020: NOW FULL
Replies: 175
Views: 7859

Re: ABUG SOUTH 24 to 26 January 2020 (Hampshire) BOOKING THREAD

So soon! Oh go on then, yes, please put me down for a table from Friday through Sunday. Thanks again for organising. :)
by kieranhj
Sun Nov 24, 2019 11:44 am
Forum: software: other
Topic: New music conversion - Castlevania III
Replies: 17
Views: 1266

Re: New music conversion - Castlevania III

Great work Sarah! It was lovely to hear this on real hw at ABUG. :) Sounds amazing, like a real arcade machine and nothing like a Beeb! =D>
by kieranhj
Fri Nov 22, 2019 6:38 pm
Forum: upcoming and recent events & exhibitions
Topic: ABUG SOUTH 22 to 24 November 2019 - NOW FULL
Replies: 179
Views: 8941

Re: ABUG SOUTH 22 to 24 November 2019 - NOW FULL

Not very Acorn, I know, but does anyone have an Amiga 1200 they could bring along this weekend please? I have a new 8mb RAM upgrade for mine but it resolutely refuses to work. It would be great to determine whether the problems lies with the RAM board or my motherboard before I (continue) complainin...
by kieranhj
Mon Nov 18, 2019 7:04 pm
Forum: hardware
Topic: OSWORD &7F on DFS vs MMFS
Replies: 26
Views: 1135

Re: OSWORD &7F on DFS vs MMFS

Actually, it seems it didn't, at least not on the Model B. Oops, oh dear, that's definitely my bad, as they say. :oops: I'm slightly disappointed that no-one complained about it for the last two years. #-o Looks like 2 sectors reads is the way to go, at least for 'fast' devices (will need to test o...
by kieranhj
Mon Nov 18, 2019 8:09 am
Forum: hardware
Topic: OSWORD &7F on DFS vs MMFS
Replies: 26
Views: 1135

Re: OSWORD &7F on DFS vs MMFS

I had a quick look at Teletext Bad Apple this afternoon (as I wanted to test the ICE-6502 in anger). On a Model B with the latest MMFS (1.44) it crashes consistently at 00:54 due to the ring buffer underflowing. Looking at why this might be, I noticed for "fast" devices the player is dynamically pa...
by kieranhj
Sun Nov 17, 2019 2:12 pm
Forum: hardware
Topic: OSWORD &7F on DFS vs MMFS
Replies: 26
Views: 1135

Re: OSWORD &7F on DFS vs MMFS

I still need to close the loop with Kieron on the Bad Apple / MMFS issues, so this may end up changing back again. Happy to do this at ABUG next weekend, a good opportunity to get to the bottom of it with the right people in the room! I also have a sneak peak of a new streaming demo so quite timely...
by kieranhj
Wed Nov 13, 2019 10:54 pm
Forum: programming
Topic: Mode 7 flip between pages
Replies: 12
Views: 1154

Re: Mode 7 flip between pages

I’m sure there are some practical posts on here or maybe the old RetroSoftware programming forum. Otherwise check out the technical details on BeebWiki: http://beebwiki.mdfs.net/Address_translation#TTX_VDU
by kieranhj
Tue Nov 12, 2019 9:09 pm
Forum: programming
Topic: Mode 7 flip between pages
Replies: 12
Views: 1154

Re: Mode 7 flip between pages

It’s been long established that with CRTC linear addressing mode, as used for MODE 7, the screen address is generally restricted to the top 1024 bytes of lower RAM, so &7C00 to &7FFF. However on Model B there is also a mapping to &3C00 which can be used for buffer swapping. Sadly this isn’t availabl...