Search found 245 matches

by VectorEyes
Sun Sep 01, 2019 3:12 pm
Forum: upcoming and recent events & exhibitions
Topic: Retro Computer Festival 2019 - 7th & 8th September
Replies: 1
Views: 174

Re: Retro Computer Festival 2019 - 7th & 8th September

Sounds fantastic but I have to save my weekends for precious ABUG meets. If anyone feels like taking pictures of interesting stuff please do so!
by VectorEyes
Sat Aug 31, 2019 5:43 pm
Forum: projects
Topic: Wave Runner Demo Details
Replies: 20
Views: 1032

Re: Wave Runner Demo Details

Another thread bump! Closing Thoughts section has been done (actually I wrote it a few weeks ago but didn't want to bump the thread until I'd finished a few other things.) The source code is now available on Github: https://github.com/bitshifters/wave-runner Finally, the 'incorrect scrolltext colour...
by VectorEyes
Fri Aug 30, 2019 3:18 pm
Forum: hardware
Topic: A blitter for the beeb?
Replies: 103
Views: 9600

Re: A blitter for the beeb?

Just a quick note to say that this sounds really interesting. And I quite like 'Aeris' for the name!
by VectorEyes
Mon Aug 19, 2019 3:38 pm
Forum: emulators
Topic: Emulation tests
Replies: 13
Views: 538

Re: Emulation tests

Writing a sequence of values (or just one odd value) to a nonexistent CRTC register?
by VectorEyes
Sun Aug 18, 2019 4:44 pm
Forum: hardware
Topic: Testing all RAM in a Master 128
Replies: 4
Views: 213

Re: Testing all RAM in a Master 128

Just in Twisted Brain, or elsewhere as well? There's a known issue in Twisted Brain where it can show some spurious lines in the 'Twister' section. It depends on what screen mode you were in when you booted the demo. It's also known to have problems with some of the more obscure 6845 CRTC chips foun...
by VectorEyes
Sat Aug 17, 2019 9:01 am
Forum: upcoming and recent events & exhibitions
Topic: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019. FULL
Replies: 132
Views: 5543

Re: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019

I rescued all the old Risc PCs from ARM ltd. just recently. Got stacks in my room. Only a couple of interesting ones which I will be sure to bring along. My God. Do you have any with uncorroded motherboards?... Yes, I have removed all the batteries...there is one that boots up to a screwed up graph...
by VectorEyes
Wed Aug 14, 2019 9:49 pm
Forum: upcoming and recent events & exhibitions
Topic: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019. FULL
Replies: 132
Views: 5543

Re: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019

riscman wrote:
Wed Aug 14, 2019 9:42 pm
I rescued all the old Risc PCs from ARM ltd. just recently. Got stacks in my room. Only a couple of interesting ones which I will be sure to bring along.
My God. Do you have any with uncorroded motherboards?...
by VectorEyes
Tue Aug 13, 2019 8:44 am
Forum: projects
Topic: Wave Runner Demo Details
Replies: 20
Views: 1032

Re: Wave Runner Demo Details

Thread bump! I have updated the Logo Dissolve, Intro/Outro and Vertical Scrolltext write-ups. I will write up some closing thoughts shortly.
by VectorEyes
Mon Aug 12, 2019 8:16 am
Forum: software: classic games
Topic: Exile - early port
Replies: 3
Views: 397

Re: Exile - early port

Yes, this is fascinating. Thanks!

(I'd love to play that version! A mix of the original Beeb version and the eventual C64 release.)
by VectorEyes
Fri Aug 09, 2019 6:00 pm
Forum: general
Topic: Remarkable videos recently posted on Youtube
Replies: 260
Views: 29226

Re: Remarkable videos recently posted on Youtube

It's a shame they're moving, I always thought I might take a trip up there one day for the pure nostalgia factor of walking into an 'Acorn' shop!

(I'd inevitably end up buying lots of stuff of course!)
by VectorEyes
Wed Aug 07, 2019 8:18 pm
Forum: hardware
Topic: BBC clock speed
Replies: 23
Views: 742

Re: BBC clock speed

Quick note to clarify (maybe?) the previous post. Although from the CRTC's perspective it's outputting sequential numbers as the raster-beam scans along one scanline, the way the address lines and multiplexer chips work mean that the actual address fetched increases by eight each time the CRTC moves...
by VectorEyes
Wed Aug 07, 2019 4:54 pm
Forum: hardware
Topic: BBC clock speed
Replies: 23
Views: 742

Re: BBC clock speed

Yes, the CRTC simply generates addresses by making some of its output pins high and others low. It does not fetch the values stored at that address, it just creates the number, puts it on the address bus, and it's the responsibility of other parts of the system to fetch the byte stored at the addres...
by VectorEyes
Mon Aug 05, 2019 10:02 pm
Forum: wanted
Topic: Wanted: map and clues sheet for BBC Exile
Replies: 6
Views: 301

Re: Wanted: map and clues sheet for BBC Exile

I don't recall there being a printed map or clue sheet available when I bought it, and I'm pretty positive I bought it when it was first released. Could this have been a re-release?
by VectorEyes
Mon Jul 22, 2019 12:03 am
Forum: for sale / freebies
Topic: Take my money! BNIB BBC Master!
Replies: 14
Views: 962

Re: Take my money! BNIB BBC Master!

If you mean the one referenced in the first post in this thread... I was watching it with great interest on Facebook Marketplace. The seller said that he was going to come back a bit later and offer it for sale once he'd decided on a price, but he never did. My assumption was that someone had made h...
by VectorEyes
Wed Jul 17, 2019 7:28 pm
Forum: hardware
Topic: I have an Atomwide Risc PC 8 Slot Backplane with a set of metal case fixings (long!)
Replies: 10
Views: 417

Re: I have an Atomwide Risc PC 8 Slot Backplane with a set of metal case fixings (long!)

I'm sort of interested. I have three RiscPCs and the thought of cannibalising the broken ones to make a franken-RPC has occasionally occured to me... Although I must admit I'm not sure I have enough podules to do it justice! :)
by VectorEyes
Wed Jul 17, 2019 2:38 pm
Forum: projects
Topic: Wave Runner Demo Details
Replies: 20
Views: 1032

Re: Wave Runner Demo Details

A link to the demo would be useful. Nice use of animated GIFs :D Thanks, and good point! I'm sure my notes for the first section had a link but apparently not. I've amended the first section and added the link. The animated GIFs were created by exporting a video from B2 and then running it through ...
by VectorEyes
Tue Jul 16, 2019 11:26 pm
Forum: projects
Topic: Wave Runner Demo Details
Replies: 20
Views: 1032

Re: Wave Runner Demo Details

Just a note to say that I have added the sections on 'NOP Slides and Clockslides' and the 'Double Sine Wave' effect. Work commitments mean I can't write these up as quickly as I'd like, but I'm very happy to answer questions or discuss areas where people want more detail, and I'm sure everyone else ...
by VectorEyes
Thu Jul 11, 2019 11:52 pm
Forum: emulators
Topic: Unreleased Android version of B-Em
Replies: 8
Views: 740

Re: Unreleased Android version of B-Em

No, that's a different Kieran. He's active on here quite a bit.
by VectorEyes
Tue Jul 09, 2019 11:37 pm
Forum: projects
Topic: Wave Runner Demo Details
Replies: 20
Views: 1032

Re: Wave Runner Demo Details

(Placeholder: Anything else I forgot!)
by VectorEyes
Tue Jul 09, 2019 11:36 pm
Forum: projects
Topic: Wave Runner Demo Details
Replies: 20
Views: 1032

Re: Wave Runner Demo Details

Closing thoughts Before I get to anything else, I'd like to reiterate that Wave Runner was a team effort. Myself and Tom Seddon did the framework and effects code, the music compression and playback came from SimonM (via Twisted Brain), HexWab helped out with music player speedups (and also prototy...
by VectorEyes
Tue Jul 09, 2019 11:36 pm
Forum: projects
Topic: Wave Runner Demo Details
Replies: 20
Views: 1032

Re: Wave Runner Demo Details

(Placeholder: Chequerboard Effect)
by VectorEyes
Tue Jul 09, 2019 11:35 pm
Forum: projects
Topic: Wave Runner Demo Details
Replies: 20
Views: 1032

Re: Wave Runner Demo Details

(Placeholder: 'Blobs' Effect)
by VectorEyes
Tue Jul 09, 2019 11:35 pm
Forum: projects
Topic: Wave Runner Demo Details
Replies: 20
Views: 1032

Re: Wave Runner Demo Details

Vertical Scrolltext Perhaps surprisingly, this effect is one of the more complicated ones, both in terms of code complexity in the Update and Render functions, and in terms of the pre-processing steps and tools used to generate the code and data. To understand this effect, we'll start by describing...
by VectorEyes
Tue Jul 09, 2019 11:35 pm
Forum: projects
Topic: Wave Runner Demo Details
Replies: 20
Views: 1032

Re: Wave Runner Demo Details

Intro and Outro Image Sequence These are relatively simple effects, which showcase Dethmunk's artistic skills by displaying a sequence of images. There are essentially three types of transition used by these effects: Palette-based: The palette changes from 'all colours black' to 'standard MODE2 col...
by VectorEyes
Tue Jul 09, 2019 11:35 pm
Forum: projects
Topic: Wave Runner Demo Details
Replies: 20
Views: 1032

Re: Wave Runner Demo Details

Logo Dissolve Effect Overview This effect -- the first one in the demo -- is based on vertical rupture, not stable raster. The effect reprograms the CRTC each scanline to choose which line of the logo to render (and also changes the palette to control the logo colour) but it does not 'draw' images ...
by VectorEyes
Tue Jul 09, 2019 11:34 pm
Forum: projects
Topic: Wave Runner Demo Details
Replies: 20
Views: 1032

Re: Wave Runner Demo Details

Double Sine Wave Effect Introduction This effect uses stable raster to render a superposition of two sine waves. Each wave can have its left/right movement speed and vertical scale adjusted independently, and by choosing values carefully a variety of interesting patterns can be created. When the ef...
by VectorEyes
Tue Jul 09, 2019 11:34 pm
Forum: projects
Topic: Wave Runner Demo Details
Replies: 20
Views: 1032

Re: Wave Runner Demo Details

NOP Slides and Clockslides In several places the demo needs to delay by an exact number of cycles, but the cycle count is continually changing and only known at runtime. The techniques necessary to do this are out there on the Web (e.g. https://www.pagetable.com/?p=669 ) but for those who are inter...
by VectorEyes
Tue Jul 09, 2019 11:34 pm
Forum: projects
Topic: Wave Runner Demo Details
Replies: 20
Views: 1032

Re: Wave Runner Demo Details

The Demo Framework Wave Runner is heavily influenced by, and shares some code with, Twisted Brain (hereafter known as 'TB') There will be places in this write-up where it's easier to refer to TB and describe how Wave Runner is different than to describe how Wave Runner works in detail. Similarities...
by VectorEyes
Tue Jul 09, 2019 11:33 pm
Forum: projects
Topic: Wave Runner Demo Details
Replies: 20
Views: 1032

Wave Runner Demo Details

Introduction In a similar manner to Kieran's Twisted Brain write-up from last year, I'm going to describe how Wave Runner works under the hood, as well as providing some details about its genesis and how it all came together. The demo itself can be found here: https://bitshifters.github.io/posts/pr...
by VectorEyes
Sun Jul 07, 2019 11:12 pm
Forum: upcoming and recent events & exhibitions
Topic: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019. FULL
Replies: 132
Views: 5543

Re: Acorn World and ABUG meetup, Cambridge 20-22nd September 2019

Could I have a full table for Saturday and Sunday? I have too few holiday days left this year to justify the Friday!