Search found 2006 matches

by tricky
Tue Jan 23, 2018 12:22 pm
Forum: hardware
Topic: Connecting SEGA Mega Drive controllers to the beeb
Replies: 23
Views: 389

Re: Connecting SEGA Mega Drive controllers to the beeb

Thanks guys, I might try and do one that I actually get produced. This was just something that I tried last night - it is "by hand" if that means no auto routing, other than picking the best line between two point - that is no push the button and sit back while lines appear everywhere. I j...
by tricky
Tue Jan 23, 2018 8:05 am
Forum: hardware
Topic: Connecting SEGA Mega Drive controllers to the beeb
Replies: 23
Views: 389

Re: Connecting SEGA Mega Drive controllers to the beeb

JGH, thanks for the reassurance and thanks to the others who's advice is very welcome as I might actually get to order one of these designs one day.
I would like about a dozen of these for myself, but doing them as I have for the prototype is really out of the question.
Thanks again all of you.
by tricky
Mon Jan 22, 2018 11:32 pm
Forum: hardware
Topic: Connecting SEGA Mega Drive controllers to the beeb
Replies: 23
Views: 389

Re: Connecting SEGA Mega Drive controllers to the beeb

In case you aren't board with this, here is what I made in KiCad, I don't know if it is any good, you judge :roll: http://stardot.org.uk/forums/download/file.php?id=34914 The three pin header is where the switch attaches to swap between 1 joystick 2/4 buttons and 2 joysticks 1/2 buttons each. layout...
by tricky
Sun Jan 21, 2018 8:29 pm
Forum: hardware
Topic: BBC Circuit diagram
Replies: 8
Views: 164

Re: BBC Circuit diagram

Thanks that is much better than the one that I got with my beeb.
by tricky
Sun Jan 21, 2018 1:38 pm
Forum: hardware
Topic: Connecting SEGA Mega Drive controllers to the beeb
Replies: 23
Views: 389

Re: Connecting SEGA Mega Drive controllers to the beeb

It actually connects to CB2 on the system via, driving it doesn't seem to upset the 6845, but that is when I have full control.
by tricky
Sun Jan 21, 2018 12:10 pm
Forum: hardware
Topic: Connecting SEGA Mega Drive controllers to the beeb
Replies: 23
Views: 389

Re: Connecting SEGA Mega Drive controllers to the beeb

The cable I used which I found very easy to work with for this was £4.15 for 10m from ebay (UK) and the mega drive controllers were £1.60+15p p&p each from ebay (China) . I have no connection to these auctions and as I said before, the controllers feel very "cheap", but then they are :...
by tricky
Sun Jan 21, 2018 11:56 am
Forum: hardware
Topic: Connecting SEGA Mega Drive controllers to the beeb
Replies: 23
Views: 389

Re: Connecting SEGA Mega Drive controllers to the beeb

The second prototype works, although I haven't tried the extra fire buttons yet! The 6.8K resistors should probably be a little lower, or the 20K ones a little higher as the midpoint is over 1/2 voltage, &8C00 instead of &8000 when measured through the ADC. I checked the datasheet and it see...
by tricky
Sun Jan 21, 2018 9:42 am
Forum: hardware
Topic: Connecting SEGA Mega Drive controllers to the beeb
Replies: 23
Views: 389

Re: Connecting SEGA Mega Drive controllers to the beeb

For the beeb, I would need to check if that chip works with 1.9v outputs. For the Dragon32, there is someone making a 2-Atari to beeb converter, maybe he could change his design slightly for the Dragon. The dragon seems to have its analogue directions inverted compared to the beeb and be 5v instead ...
by tricky
Sun Jan 21, 2018 9:36 am
Forum: hardware
Topic: Connecting SEGA Mega Drive controllers to the beeb
Replies: 23
Views: 389

Re: Connecting SEGA Mega Drive controllers to the beeb

"shouldn't work" #-o ...What's the LPSTB hack?... Firstly, sorry for the use of the word "hack", I must be getting down with the kids!" Instead of using the LPSTB input to trigger capturing the CRTC beam position for a light pen, you set it as output and use it to swap betwe...
by tricky
Sat Jan 20, 2018 7:02 pm
Forum: hardware
Topic: Connecting SEGA Mega Drive controllers to the beeb
Replies: 23
Views: 389

Re: Connecting SEGA Mega Drive controllers to the beeb

Kazzie, The idea is similar, but I am just using the circuit in the controller to pull the lines up and down and then, similar resistors to centre the voltage. I added an extra resistor to pull the voltage down to the range required by the ADC on the beeb (seemingly unnecessary on the dragon). I als...
by tricky
Sat Jan 20, 2018 9:01 am
Forum: hardware
Topic: Connecting SEGA Mega Drive controllers to the beeb
Replies: 23
Views: 389

Re: Connecting SEGA Mega Drive controllers to the beeb

Unfortunately, when I finished wiring the prototype, it was wrong! start_again.jpg When I first check the outputs from the joypad, I measured each button as 5v unpressed, dropping to 0v when pressed, as is normal with these things (pull up, short to ground). When I put it on the prototyping board, ...
by tricky
Thu Jan 18, 2018 8:22 pm
Forum: hardware
Topic: Newbie question regarding first machine
Replies: 16
Views: 456

Re: Newbie question regarding first machine

They did replace all the "illegal" ops with NOPs, but I didn't know if any had the same behaviour as an added op - probably not.
I believe (but haven't checked) that 6502 jmp (&xxFF) will read &xxFF and &xx00, rather than 65C02 &xxFF &yy00 where yy=xx+1.
by tricky
Thu Jan 18, 2018 8:00 pm
Forum: hardware
Topic: Fault finding index
Replies: 86
Views: 16951

Re: Fault finding index

Hoglet, sorry, I need to go back and read that thread, but does you software check reads from memory with "known" values to spot dodgy RAM etc?
by tricky
Thu Jan 18, 2018 7:58 pm
Forum: hardware
Topic: Newbie question regarding first machine
Replies: 16
Views: 456

Re: Newbie question regarding first machine

8. the Master runs faster Any idea why? ... I guess he means BASIC, but maybe some OS routines too as you know you have a 65C02 with a its few extra instructions which, can save spilling a register and in turn make a noticeable difference in a tight loop. For my stuff, I stick to "documented/l...
by tricky
Wed Jan 17, 2018 9:21 pm
Forum: introduce yourself
Topic: Hello from Greece.
Replies: 6
Views: 181

Re: Hello from Greece.

Welcome,
an Elk is a good place to start ;)
by tricky
Wed Jan 17, 2018 6:23 pm
Forum: hardware
Topic: How do Beebs break in transit?
Replies: 11
Views: 413

Re: How do Beebs break in transit?

I had four beebs and a master arrive all with broken cases and packaging smashed in with boot prints on the box! I have also had internal expansions loose, but they may have been that way and one with a broken key, again with badly marked packaging. I guess you might loose a track to a crack if the ...
by tricky
Wed Jan 17, 2018 6:18 pm
Forum: software: classic games
Topic: Does it exists a version of "Death race" for the beeb?
Replies: 4
Views: 255

Re: Does it exists a version of "Death race" for the beeb?

:oops: In this case, you could probably draw everything with user defined characters and EOR your car on and off to move it. Bounding boxes are probably OK for collision, so keeping an array should do. So, this might actually be "easy", not "tricky easy" ;) Disclaimer, I have nev...
by tricky
Tue Jan 16, 2018 11:32 pm
Forum: hardware
Topic: Newbie question regarding first machine
Replies: 16
Views: 456

Re: Newbie question regarding first machine

For myself, I prefer B+, B, compact and lastly master, but this is not what I would recommend for others. Compact is probably most expensive and least compatible. B is probably cheapest and most compatible. Sideways ram is cheap to add to a B, but is poorly supported. Master is a good compromise, co...
by tricky
Tue Jan 16, 2018 8:22 pm
Forum: software: classic games
Topic: Does it exists a version of "Death race" for the beeb?
Replies: 4
Views: 255

Re: Does it exists a version of "Death race" for the beeb?

I've never seen it, but as it only has one sprite IIRC, your right, it should be very easy, even from BASIC.
by tricky
Sun Jan 14, 2018 9:36 pm
Forum: programming
Topic: BeebAsm's Hello World - printing part of file name, not "Hello World"
Replies: 13
Views: 341

Re: BeebAsm's Hello World - printing part of file name, not "Hello World"

There were some additions last year (can't find the thread).
RichTW was working talking about a new version, but it didn't look very lightly.
by tricky
Sun Jan 14, 2018 9:29 pm
Forum: hardware
Topic: SpectROM - Speccy emulator for the Pi co-pro
Replies: 73
Views: 1629

Re: SpectROM - Speccy emulator for the Pi co-pro

Batman the movie
Beach buggy simulator
More tea vicar (lots of particles)
Repton 1 and 2 ported by Gil who wrote Jeltron with me in the 80s.
No scrolling, but what does bomb Jack look like ;)
by tricky
Sun Jan 14, 2018 8:14 pm
Forum: hardware
Topic: Which replacement parts are available new?
Replies: 5
Views: 284

Re: Which replacement parts are available new?

6522s seem to be around.
It might be worth having a chat with Lazarus I think he is still making a 6502 homebrew and is quite familiar with the beeb.
by tricky
Sat Jan 13, 2018 8:50 pm
Forum: software: other
Topic: What version of Windows is best for running emulators, assemblers etc?
Replies: 5
Views: 277

Re: What version of Windows is best for running emulators, assemblers etc?

I use 7 for my stuff (see my sig), but the main local emulators (beebem and b-em) are both available for linux (I guess that's what your using) as is beebasm, which is the cross-assembler that quite a few of us use for making beeb projects. I have only tried SWIFT briefly, and don't let me put you o...
by tricky
Sat Jan 13, 2018 4:57 pm
Forum: introduce yourself
Topic: Greetings and salutations
Replies: 9
Views: 210

Re: Greetings and salutations

Welcome, I don't know of anyone who had built a beeb from scratch, other than I did see a couple of new old stock bare boards a few years back. I'm sure you have been scanning the threads already, but you might like to look at the Video NULA (new ULA) project (also used for SpectROM) as a modern rep...
by tricky
Sat Jan 13, 2018 1:57 am
Forum: hardware
Topic: SpectROM - Speccy emulator for the Pi co-pro
Replies: 73
Views: 1629

Re: SpectROM - Speccy emulator for the Pi co-pro

Well done Rob, more great work. Is the Pi fast enough to look for small areas of shifted/scrolled graphics and send a scroll command for an area? It could probably be optimised along th lines of a frame rate converter, but apart from paperboy, horizontal and vertical 1,2,4,8 pixels should cover it, ...
by tricky
Fri Jan 12, 2018 7:53 pm
Forum: software: new games
Topic: A new Warlords emulator for the beeb (was Writing a ...)
Replies: 51
Views: 4560

Re: A new Warlords emulator for the beeb (was Writing a ...)

To see my continuing adventures in connecting other system's controllers to the beeb, see this Connecting SEGA Mega Drive controllers to the beeb thread.
by tricky
Fri Jan 12, 2018 7:50 pm
Forum: hardware
Topic: Connecting SEGA Mega Drive controllers to the beeb
Replies: 23
Views: 389

Connecting SEGA Mega Drive controllers to the beeb

I have been looking at adding joystick support for when I take my games on the road and not really been very happy with any of the solutions. * I wanted something cheap (as they may walk or get broken and I might want quite a few). * be compatible with standard analogue sticks so that they could be ...
by tricky
Sun Jan 07, 2018 11:31 am
Forum: hardware
Topic: Broken Beeb - strange memory issue, what to try next?
Replies: 12
Views: 568

Re: Broken Beeb - strange memory issue, what to try next?

Well done and now you have a working spare.
by tricky
Fri Jan 05, 2018 9:32 pm
Forum: introduce yourself
Topic: Hello!
Replies: 10
Views: 260

Re: Hello!

Welcome, glad to have you on board.
I got my Elk a little after you, but you have had yours about 1,500 times longer than I had mine ;)

Go to advanced search