Search found 2464 matches

by tricky
Sat May 12, 2018 11:48 am
Forum: software: other
Topic: SN76489 best sample playback?
Replies: 44
Views: 1218

Re: SN76489 best sample playback?

The SN76489AN used in most (all?) BBCs does indeed reset the bit sequence when writing to the noise control register. I know the NCR 8496 does not (this is required by the LucasArts Tandy music driver), not sure about the other chips. Most then as I have one that doesn't and seems to be factory fit...
by tricky
Sat May 12, 2018 6:08 am
Forum: software: other
Topic: SN76489 best sample playback?
Replies: 44
Views: 1218

Re: SN76489 best sample playback?

I vaguely remember that I played with setting frequency to 1 years ago, but I don't think it works, although I think it does on some other versions of the chip. On another version, I believe that the bit sequence is reset when setting the noise frequency, so that that can also be used to get a stead...
by tricky
Fri May 11, 2018 4:53 pm
Forum: software: other
Topic: SN76489 best sample playback?
Replies: 44
Views: 1218

Re: SN76489 best sample playback?

Sample playback in the usual emulators can sound from different to completely unrecognisable, so always test on Real HW, but then I guess it won't work for people emulating. Also watch out for emulators that reset the timer when data is sent, I think this is how some of the SN76489 chips work, but n...
by tricky
Tue May 08, 2018 9:24 pm
Forum: emulators
Topic: Which emulator to use: developing on Windows (VS2017)...
Replies: 4
Views: 294

Re: Which emulator to use: developing on Windows (VS2017)...

I build beebem with vs2017, although I always have dxsdk2010june installed. It is very easy to mod to add the type of features you describe. I have also hacked importing of the labels that beebasm can export as well as auto saving break and watch points relative to those labels. I was thinking of ad...
by tricky
Mon May 07, 2018 9:11 pm
Forum: hardware
Topic: Use old PC gamepad with Beeb: are they compatible?
Replies: 4
Views: 184

Re: Use old PC gamepad with Beeb: are they compatible?

PC joysticks were originally analogue, but the they just provide different resistances and the PC card does the rest. The beeb is given two voltages and returns a value between them which the chip in the beeb turns into a number. Here is the thread with that EEVBLOG video http://stardot.org.uk/forum...
by tricky
Mon May 07, 2018 8:56 pm
Forum: hardware
Topic: Use old PC gamepad with Beeb: are they compatible?
Replies: 4
Views: 184

Re: Use old PC gamepad with Beeb: are they compatible?

Sorry, they aren't pin compatible, and I haven't heard of a converter, but you may be able to mod the pad. There are a few threads around explaining why, but the simple answer is it is cheaper to do it the way the PC did, even though it isn't as good. I think I may have linked an EEVBLOG that descri...
by tricky
Sun May 06, 2018 6:55 am
Forum: off-topic
Topic: Acorn Art Thread
Replies: 292
Views: 21358

Re: Acorn Art Thread

Wow =D> looks like you might be getting the hang of this art thing ;)
by tricky
Sat May 05, 2018 9:48 pm
Forum: software: new games
Topic: New version of Scramble for the beeb (going well)
Replies: 48
Views: 2719

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

You have it correct. The plan is to use 224x256 to match the arcade. I think that there is enough time to avoid flicker. The trick is to setup (no matter how slowly) the drawing so as to minimise the actual update time. The longest setup is about half a frame, but this allows the top and bottom land...
by tricky
Sat May 05, 2018 12:20 pm
Forum: software: new games
Topic: New version of Scramble for the beeb (going well)
Replies: 48
Views: 2719

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

It is just changing the background colour, but I think this version of beebem doesn't update the palette as frequently as b-en, plus I wait half a scanline before going back to black.
by tricky
Sat May 05, 2018 9:55 am
Forum: software: new games
Topic: New version of Scramble for the beeb (going well)
Replies: 48
Views: 2719

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

I had a go at adding the sprites this morning and this is what I have. I still need to add the boss and KONAMI. timing_shot.png The four lines at the bottom are temporary timing lines: Yellow: start of drawing. Cyan: end of land drawing/start of sprite drawing. Magenta: end of sprite drawing/start o...
by tricky
Fri May 04, 2018 12:01 pm
Forum: software: new games
Topic: New version of Centipede for the BBC Micro (in progress)
Replies: 59
Views: 4724

Re: New version of Centipede for the BBC Micro (in progress)

That is exactly what the misses said 10 seconds after I posted that image.
I'll change it.
Note to self, next time don't bother with instructions ;)
by tricky
Thu May 03, 2018 7:48 pm
Forum: hardware
Topic: Connecting SEGA Mega Drive controllers to the beeb
Replies: 31
Views: 1815

Re: Connecting SEGA Mega Drive controllers to the beeb

I've just ordered some boards from jlcpcb.com, I only ordered the dual boards as the single ones didn't preview, so I wasn't sure they had loaded correctly.
by tricky
Thu May 03, 2018 4:36 pm
Forum: hardware
Topic: Adapting joysticks for the BBC micro
Replies: 12
Views: 323

Re: Adapting joysticks for the BBC micro

There is also this thread on what it links to.
viewtopic.php?f=3&t=14485
by tricky
Thu May 03, 2018 4:31 pm
Forum: software: new games
Topic: New version of Frogger (was: A demo of what is looking like a new Frogger for the beeb)
Replies: 191
Views: 22126

Re: New version of Frogger (was: A demo of what is looking like a new Frogger for the beeb)

A while back I started making the main file loadable as a ROM and it had to be compressed to do that.
There should be old uncompressed and new compressed, as a side effect, it should load faster :)
by tricky
Wed May 02, 2018 6:58 pm
Forum: software: new games
Topic: New version of Scramble for the beeb (going well)
Replies: 48
Views: 2719

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

I haven't touched the code, but have generated the data for the rockets, fuel etc, but not for anything that moves. tiles 1008 bytes that make up the level land 3882 bytes maps of each level drawing 983 bytes mostly self modifying unrolled loops advance 258 bytes level across screen (not including s...
by tricky
Wed May 02, 2018 4:51 pm
Forum: software: new games
Topic: New version of Frogger (was: A demo of what is looking like a new Frogger for the beeb)
Replies: 191
Views: 22126

Re: New version of Frogger (was: A demo of what is looking like a new Frogger for the beeb)

Thanks to both of you.
Looks good, but I think you could score more if you tried ;)
by tricky
Wed May 02, 2018 4:43 pm
Forum: software: new games
Topic: New version of Centipede for the BBC Micro (in progress)
Replies: 59
Views: 4724

Re: New version of Centipede for the BBC Micro (in progress)

I'll have a look, I could try and blame it on writing them in a hex editor, but I also can't spell ;)
by tricky
Tue May 01, 2018 10:14 pm
Forum: software: other
Topic: Trying to get a rom into an SSD
Replies: 14
Views: 668

Re: Trying to get a rom into an SSD

I'm planning on adding a gotek or two to my torch system as they seem likely to be the most compatible option but am not likely to get around to it in the near future.
by tricky
Tue May 01, 2018 10:07 pm
Forum: software: new games
Topic: New version of Frogger (was: A demo of what is looking like a new Frogger for the beeb)
Replies: 191
Views: 22126

Re: New version of Frogger (was: A demo of what is looking like a new Frogger for the beeb)

Thanks,
I notice that the b-em link (to sth) is to quite an old version (may still be the latest release though).
by tricky
Tue May 01, 2018 7:45 pm
Forum: introduce yourself
Topic: Greetings!
Replies: 10
Views: 526

Re: Greetings!

Welcome, great history.
Hedgehog looks a little "tricky" ;)
I have done some beeb versions of Frogger and Centipede if you are interested.
by tricky
Tue May 01, 2018 7:42 pm
Forum: software: new games
Topic: New version of Centipede for the BBC Micro (in progress)
Replies: 59
Views: 4724

Re: New version of Centipede for the BBC Micro (in progress)

I hope I have now fixed the unfair death if you are immediately below a segment, just as it is about to reverse and go up. I have also added preliminary Trackball support for the STACK trackball (thanks Arcadian), it should also work in "analogue mouse stick" mode in emulators. Your avatar is a litt...
by tricky
Tue May 01, 2018 6:08 am
Forum: off-topic
Topic: Messing about with 6507 CPUs...
Replies: 5
Views: 307

Re: Messing about with 6507 CPUs...

Hey, its not old, I'm older than it ;)
I think eevblog did something similar to make a handheld 2600, I was amazed then too :)
by tricky
Tue May 01, 2018 6:00 am
Forum: development tools
Topic: BeebAsm
Replies: 73
Views: 5093

Re: BeebAsm

Sorry, I had forgotten that was added.
I will add the export symbols with dots to there enclosing scope locally and see how it feels. I like having beebem showing the labels as I step and adjusting breakpoint and watch addresses automatically from one run to the next.
by tricky
Mon Apr 30, 2018 7:44 pm
Forum: development tools
Topic: BeebAsm
Replies: 73
Views: 5093

Re: BeebAsm

Consider this an early suggestion for the next release ;) I sometimes find myself with code like: .function { ;; ... .label ;; ... } where I would like to jump to label from outside function. What do people think about jsr function.label? I would also like to export function.label when exporting sym...