Search found 565 matches

by lazarusr
Thu Jun 22, 2017 7:32 am
Forum: hardware
Topic: Are there old books online for the Beeb/Elk?
Replies: 6
Views: 233

Re: Are there old books online for the Beeb/Elk?

Bruce Smith has made all the books he wrote available online: http://www.brucesmith.info/bbc-micro-an ... ed-titles/
by lazarusr
Wed Jun 21, 2017 6:09 pm
Forum: hardware
Topic: Music 5000 FPGA
Replies: 52
Views: 6872

Re: Music 5000 FPGA

lazarusr wrote:Managed to get this working on my Papilio One.

OK, don't try this at home. The Papilio One is not 5V tolerant so you could damage it. Luckily, mine seems OK.
by lazarusr
Sat Jun 17, 2017 7:57 pm
Forum: hardware
Topic: Music 5000 FPGA
Replies: 52
Views: 6872

Re: Music 5000 FPGA

OK. Yes, it sounds a bit closer to the original with the precise clock.

I am using the same MCP4822 you used.
by lazarusr
Sat Jun 17, 2017 7:23 pm
Forum: hardware
Topic: Music 5000 FPGA
Replies: 52
Views: 6872

Re: Music 5000 FPGA

Managed to get this working on my Papilio One. It really is brilliant. Thanks Dave.

IMG_0180.jpg

One thing (one of the many things) I don't understand - why have you used a 23.7832 MHz clock when the original Music 5000 had a 12 MHz oscillator?
by lazarusr
Sat Jun 10, 2017 10:59 pm
Forum: acorn atom
Topic: Is there still any interest for Atom2k15 boards
Replies: 4
Views: 122

Re: Is there still any interest for Atom2k15 boards

I might be interested in one. Although, strictly speaking, at the moment, I have run out of retro money.
by lazarusr
Sat Jun 10, 2017 12:50 am
Forum: software: other
Topic: BeebOPL and ARM7TDMI
Replies: 3
Views: 180

Re: BeebOPL and ARM7TDMI

Sadly, I have nothing in BASIC. It very quickly became apparent that on a vanilla 6502A, BASIC was going to be too slow.

There are quite a lot of resources here. But it is a lot to wade through.
by lazarusr
Fri Jun 09, 2017 8:01 pm
Forum: software: other
Topic: BeebOPL and ARM7TDMI
Replies: 3
Views: 180

Re: BeebOPL and ARM7TDMI

The structure of DRO files is set out here . In simple terms, it is just a question of sending the data in the file to the OPL chip at the right time. The code I wrote isn't Tube compliant. If you want to use it over the Tube, rather than writing to &FC04 and &FC05 you should be using OSBYTE...
by lazarusr
Wed Jun 07, 2017 5:02 pm
Forum: hardware
Topic: Acorn Music 5000
Replies: 12
Views: 315

Re: Acorn Music 5000

Mark Haysman (Retroclinic) sells a package that includes the manual, the disc and the ROM. He also sells the programmer's reference guide. You should get a 5pin DIN to 3.5mm stereo lead (such as this http://www.maplin.co.uk/p/maplin-35mm-jack-to-5-pin-din-cable-15m-a31xf) - then you can plug it in t...
by lazarusr
Thu May 25, 2017 10:45 am
Forum: hardware
Topic: Possibly Unscanned Acorn Circuit Diagrams - Need Help!
Replies: 6
Views: 305

Re: Possibly Unscanned Acorn Circuit Diagrams - Need Help!

If you can come to Central London one evening, I am pretty sure that the scanners at work are A3.
by lazarusr
Mon May 15, 2017 8:34 pm
Forum: software: other
Topic: BeebOPL choons
Replies: 45
Views: 2027

Re: BeebOPL choons

Time for another disc. Once again, this is one of the several music discs that AdLib sold to owners of the AdLib Music Synthesizer Card. This one was 'optimistically' called " Pop/Rock Grooves ". All your 'favourites' are here including Traffix, Visions of Glory and Business Talk. Enjoy it...
by lazarusr
Sun May 14, 2017 8:57 pm
Forum: upcoming and recent events & exhibitions
Topic: May 12th-14th 2017 Cambridge ABUG (FULL) & Acorn World event at CCfCH
Replies: 188
Views: 6675

Re: May 12th-14th 2017 Cambridge ABUG (FULL) & Acorn World event at CCfCH

I'm very glad I made the effort to attend yesterday. A great day. Great company, lot's of things to see as ever plus a great exhibition. And I solved a bug in my new MIDI player!

Well done to the two Jasons for an amazing feat of organisation.
by lazarusr
Wed May 10, 2017 10:12 pm
Forum: upcoming and recent events & exhibitions
Topic: May 12th-14th 2017 Cambridge ABUG (FULL) & Acorn World event at CCfCH
Replies: 188
Views: 6675

Re: May 12th-14th 2017 Cambridge ABUG (FULL) & Acorn World event at CCfCH

jbnbeeb wrote:YWill we have BeebOPL so we can still make some lazarusr-derived noise at Cambridge?

I think a couple of people said they were bringing theirs along.
by lazarusr
Wed May 10, 2017 8:03 am
Forum: upcoming and recent events & exhibitions
Topic: May 12th-14th 2017 Cambridge ABUG (FULL) & Acorn World event at CCfCH
Replies: 188
Views: 6675

Re: May 12th-14th 2017 Cambridge ABUG (FULL) & Acorn World event at CCfCH

LUXURY ROOM AVAILABLE IN CAMBRIDGE HOTEL Something has come up that means, sadly, I am now not able to attend. I am completely gutted about this - I haven't missed an ABUG meeting since I joined StarDot. I had booked a prepaid on a no cancel basis, a King Room with Breakfast at the Cambridge Hilton....
by lazarusr
Mon May 08, 2017 4:39 pm
Forum: upcoming and recent events & exhibitions
Topic: May 12th-14th 2017 Cambridge ABUG (FULL) & Acorn World event at CCfCH
Replies: 188
Views: 6675

Re: May 12th-14th 2017 Cambridge ABUG (FULL) & Acorn World event at CCfCH

There is free parking at the museum. However, it is a small car park and it is likely to be busy because of the event. I think last time we (ABUG folks) boxed ourselves in to the car park behind, as we didn't need to leave by 5pm like the regular visitors. Pretty sure I left my car at the museum ov...
by lazarusr
Mon May 08, 2017 9:52 am
Forum: upcoming and recent events & exhibitions
Topic: May 12th-14th 2017 Cambridge ABUG (FULL) & Acorn World event at CCfCH
Replies: 188
Views: 6675

Re: May 12th-14th 2017 Cambridge ABUG (FULL) & Acorn World event at CCfCH

There is free parking at the museum. However, it is a small car park and it is likely to be busy because of the event.
by lazarusr
Fri May 05, 2017 9:52 pm
Forum: hardware
Topic: My new project (don't tell Arcardian)
Replies: 35
Views: 799

Re: My new project (don't tell Arcardian)

The latest development: https://soundcloud.com/user-469563483/princess-leias-theme This piece really challenges the 6502 code as it keeps changing the 'tempo' during the piece which in turn requires recalculating (with long division) the interrupt rate on the fly. Needless to say, I am no longer har...
by lazarusr
Wed May 03, 2017 7:25 pm
Forum: hardware
Topic: My new project (don't tell Arcardian)
Replies: 35
Views: 799

Re: My new project (don't tell Arcardian)

It is indeed a Midi file player in 6502 code. It is not too difficult, albeit somewhat more complicated than DRO files. The code I have written is only about 500 bytes long. The specification is here: http://cs.fit.edu/~ryan/cse4051/projects/midi/midi.html. I will share the code soon (I will be work...
by lazarusr
Wed May 03, 2017 7:11 pm
Forum: hardware
Topic: My new project (don't tell Arcardian)
Replies: 35
Views: 799

Re: My new project (don't tell Arcardian)

This one is for Arcadian

https://soundcloud.com/user-469563483/ultima-vi

(I know it doesn't sound quite like the original.)
by lazarusr
Wed May 03, 2017 6:56 pm
Forum: hardware
Topic: My new project (don't tell Arcardian)
Replies: 35
Views: 799

Re: My new project (don't tell Arcardian)

Despite still not having the time, I have continued to code and now I have this:

https://soundcloud.com/user-469563483/i ... own-on-you

:D :D :D
by lazarusr
Tue May 02, 2017 11:17 am
Forum: upcoming and recent events & exhibitions
Topic: May 12th-14th 2017 Cambridge ABUG (FULL) & Acorn World event at CCfCH
Replies: 188
Views: 6675

Re: May 12th-14th 2017 Cambridge ABUG (FULL) & Acorn World event at CCfCH

z0m8ied0g wrote:
lazarusr wrote:Does anyone have a BeebOPL board that they could bring to Cambridge?


I'm bringing mine so am happy for you to borrow.

Thanks
by lazarusr
Mon May 01, 2017 7:04 pm
Forum: upcoming and recent events & exhibitions
Topic: Maker Faire UK, Newcastle, Spring 2018
Replies: 5
Views: 306

Re: Maker Faire UK, Newcastle, Spring 2018

It's a full weekend. Plus we will need to set up on Saturday morning (I don't think there is access on Friday evening) and get our kit out again (" ooh err missus ") on Sunday evening. People will not have to volunteer for the full weekend. But we would really have to be able to cast iron ...
by lazarusr
Mon May 01, 2017 5:51 pm
Forum: upcoming and recent events & exhibitions
Topic: May 12th-14th 2017 Cambridge ABUG (FULL) & Acorn World event at CCfCH
Replies: 188
Views: 6675

Re: May 12th-14th 2017 Cambridge ABUG (FULL) & Acorn World event at CCfCH

Does anyone have a BeebOPL board that they could bring to Cambridge? I wouldn't mind being able to demo it to passing members of the public from time-to-time and all of mine have been harvested for various other projects. So I don't actually have a working one at the moment. :oops:
by lazarusr
Sun Apr 30, 2017 6:53 pm
Forum: general
Topic: Remarkable videos recently posted on Youtube
Replies: 102
Views: 6381

Re: Remarkable videos recently posted on Youtube

Steve Furber - His First Computer and the Prototype Acorn BBC Micro! Two fantastic donations made to the Centre for Computing by Professor Steve Furber. The first computer he ever designed, which he took to the famous Cambridge University Processor Group, and a machine that is the closest we have t...
by lazarusr
Sun Apr 30, 2017 1:29 pm
Forum: hardware
Topic: My new project (don't tell Arcardian)
Replies: 35
Views: 799

Re: My new project (don't tell Arcardian)

I have a lot of work I need to get through this weekend and so don't have time to for this project today. Unfortunately, despite not having the time, it seems that ignoring an un-programmed chip in the corner of the room is harder than it seems. So I have ended up writing a quick basic routine to ru...
by lazarusr
Sun Apr 30, 2017 7:48 am
Forum: hardware
Topic: My new project (don't tell Arcardian)
Replies: 35
Views: 799

Re: My new project (don't tell Arcardian)

I'm probably not helping but just in case you haven't seen it, this is from a forum somewhere.... Thanks. Yes, I have seen that before. The problem is I am using DRO files, so they should take care of all that. All I need to be aware of is that OPL3 has an extra register address and make sure that ...
by lazarusr
Sat Apr 29, 2017 11:05 pm
Forum: hardware
Topic: My new project (don't tell Arcardian)
Replies: 35
Views: 799

Re: My new project (don't tell Arcardian)

There are two problems - one major, one minor. The minor problem is that the interval timer doesn't generate an interrupt. I don't understand why. It is supposed to work exactly the same as OPL2. But it doesn't. I can live with that though. The major problem is that my OPL3 codes just doesn't work a...
by lazarusr
Sat Apr 29, 2017 9:55 pm
Forum: hardware
Topic: My new project (don't tell Arcardian)
Replies: 35
Views: 799

Re: My new project (don't tell Arcardian)

The project is going to be a bit of a slow burn though. There are some things going on at work which are taking up quite a bit of my time. Plus I haven't given up on OPL3 yet which, for some reason, I still can't get to work.
by lazarusr
Sat Apr 29, 2017 9:52 pm
Forum: hardware
Topic: My new project (don't tell Arcardian)
Replies: 35
Views: 799

Re: My new project (don't tell Arcardian)

Very early days at the moment. The SAM2695 is a pretty straightforward chip to work with (apart from soldering it to the PCB - 0.4m pitch QFN48!). It has a serial interface (which I am not using) and a parallel interface that is almost identical to the YM3812 - so I am using exactly the same circuit...

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