Search found 5221 matches

by danielj
Wed Feb 15, 2012 9:53 pm
Forum: for sale / freebies
Topic: FS: SLOGGER PEGASUS Electron Disk Interfaces *NEW*
Replies: 209
Views: 25112

Re: FS: SLOGGER PEGASUS Electron Disk Interfaces *NEW*

Am i right in thinking I can butcher an atari stfm for its wd1772 chip to populate this peg? Ive read elsewhere it can be done but i dont want to waste time/money finding out the hard way, also how hard is it to source all the other parts? Easy to get the bits - Retroclinic has the 1772, Beebmaster...
by danielj
Wed Feb 15, 2012 2:02 pm
Forum: introduce yourself
Topic: Hello from London
Replies: 12
Views: 1113

Re: Hello from London

Hallo! :)
by danielj
Mon Feb 13, 2012 11:34 am
Forum: off-topic
Topic: Other marques
Replies: 28
Views: 1909

Re: Other marques

I have a Victor 9000 in the loft, which I really should get back running at some point. The monitor failed to spark into life last time I looked at it, which was un-good.
by danielj
Sun Feb 12, 2012 9:42 pm
Forum: past events & exhibitions
Topic: Homebrew Gaming Weekend / 27-29 Jan 2012 / M'cr
Replies: 53
Views: 7435

Re: Homebrew Gaming Weekend / 27-29 Jan 2012 / M'cr

So after finally making it back into the country, I've fixed the lass's beeb. I did the PSU whilst I was at it; not a moment too soon judging by the cracks all over those capacitors: lasscaps.jpg Anyhow, I'll drop it back with them tomorrow. I'll continue trying to convince them to get an MMBEEB kno...
by danielj
Wed Feb 01, 2012 9:05 pm
Forum: hardware
Topic: Oh, hello
Replies: 4
Views: 525

Re: Oh, hello

Thanks Alan, I have expansion 2.02 and a Rombox plus. All working according to the instructions. I'd forgotten how slow Elk Galaforce was compared to the beeb.

So, is anyone interested in a brand new genuine slogger switched joystick interface (minus case)? I have yet to order the bits...

d.
by danielj
Wed Feb 01, 2012 8:29 pm
Forum: hardware
Topic: Possible ROM problem on a Master 128
Replies: 8
Views: 576

Re: Possible ROM problem on a Master 128

Thanks for the explanation, Daniel. When the UPURS ROM was recognised, it came up as ROM 8 on the list. Should that be the case? I've had a look at part 1 of the reference guide, but I'm still none the wiser. Must be me having a thicko moment! I think (without looking at the user guide) that that's...
by danielj
Wed Feb 01, 2012 8:02 pm
Forum: hardware
Topic: Oh, hello
Replies: 4
Views: 525

Re: Oh, hello

MartinB wrote:You'd have to guess Electron serial port or joystick interface. What are the chips?


It's the joystick. I just builded it having come into possession of some of the boards (thanks Arcadian!). I could probably build a few more... :)
by danielj
Wed Feb 01, 2012 7:37 pm
Forum: hardware
Topic: Oh, hello
Replies: 4
Views: 525

Oh, hello

What's this, back from the dead?

interface.jpg
(17.2 KiB) Downloaded 269 times


:-k
by danielj
Wed Feb 01, 2012 7:13 pm
Forum: hardware
Topic: Possible ROM problem on a Master 128
Replies: 8
Views: 576

Re: Possible ROM problem on a Master 128

That's correct behaviour, those ROM sockets aren't active unless you change some jumpers - you have to choose between using a physical ROM or having the sideways RAM banks active. It's links 18 and 19 on the motherboard - if you move 18 east, you loose banks 6 & 7 but can stick a 32K rom in IC41...
by danielj
Wed Feb 01, 2012 2:39 pm
Forum: hardware
Topic: Opus 5802 Disc Drive
Replies: 16
Views: 2862

Re: Opus 5802 Disc Drive

On further investigation trying to figure out why this drive is not reading discs anymore, I got my Carer to break off the three remaining wires which were soldered in various places of the board that goes to a small board with a few resistors and capacitors which connects to the 80/40 switch on th...
by danielj
Wed Feb 01, 2012 7:05 am
Forum: software: other
Topic: Copy files between ADFS(FD+HDD)/DFS/USB(Datacentre)
Replies: 20
Views: 2810

Re: Copy files between ADFS(FD+HDD)/DFS/USB(Datacentre)

videofx wrote:Yup, for source its DISK not DFS. Doesnt work anyway. Reads the files from DFS but when it goes to write to the ADFS HD it locks up.

Cheers!


BBC OS or Master OS?

d.
by danielj
Tue Jan 31, 2012 9:58 pm
Forum: software: other
Topic: Copy files between ADFS(FD+HDD)/DFS/USB(Datacentre)
Replies: 20
Views: 2810

Re: Copy files between ADFS(FD+HDD)/DFS/USB(Datacentre)

Found Treecopy but when I run it and say Source filing system : DFS I get broken directory. When you do a directory of a floppy you get files on top and files on the bottom. I have no problem copying files on the top but how do you copy the files on the bottom from DFS to ADFS? Cheers! Don't you ty...
by danielj
Tue Jan 31, 2012 9:23 pm
Forum: past events & exhibitions
Topic: Homebrew Gaming Weekend / 27-29 Jan 2012 / M'cr
Replies: 53
Views: 7435

Re: Homebrew Gaming Weekend / 27-29 Jan 2012 / M'cr

I've got their Beeb with me now, the one that was having a rather bad day. Beebmaster and I had a good poke at it. It had been dropped, the RAM/ROM board in it had got knocked, one of the wires had come off it, and when I hoiked that out, one of the power spades gave out on the MB. Anyway, it's goin...
by danielj
Tue Jan 31, 2012 1:38 pm
Forum: acorn atom
Topic: What's going on here then ?
Replies: 4
Views: 773

Re: What's going on here then ?

Spotted this Atom on ebay, it's not in bad nick, but there's some odd wiring on the bottom of the keyboard..... http://cgi.ebay.co.uk/290664663197 Wonder what that's all about ? Cheers. Phill. Probably fixing the broken keys he talks about? The other wires possibly going to the red button on the ba...
by danielj
Mon Jan 30, 2012 8:21 pm
Forum: hardware
Topic: Tinkering....
Replies: 107
Views: 8471

Re: Tinkering....

Hello Daniel as Mark says looks like they are using an open collector transistor to safley OR any NMI a peripheral may raise the flip flop looks as though it is there to make NMI syncronous Still think you need to clean nPGFC AlanD I'm going to do that too and try all permutations. :) Cheers. d.
by danielj
Mon Jan 30, 2012 8:11 pm
Forum: hardware
Topic: Tinkering....
Replies: 107
Views: 8471

Re: Tinkering....

The transistor is to give an open collector output to the NMI line, so it can be asserted to 0v, but left to float otherwise, so other devices can assert it. Not sure what the LS74 is doing offhand, looks like it may be syncronising the NMI to the clock perhaps? Mark. Thanks Mark, I can see that no...
by danielj
Mon Jan 30, 2012 9:58 am
Forum: hardware
Topic: Master ROM carts....
Replies: 13
Views: 1167

Re: Master ROM carts....

Well I have the Electron version too, which works in an Electron with a Plus 1. Ah, okay. However this deffo has Master written on the cartridge casing and the internal circuit board is different, it's all LS logic and only has 8K of battery backed RAM. The Electron version has 32K of battery backe...
by danielj
Mon Jan 30, 2012 7:30 am
Forum: hardware
Topic: Tinkering....
Replies: 107
Views: 8471

Re: Tinkering....

Definitely, you're doing a great job sir =D> Ha! Not really; I've started poking around on an actual AP5 :? It seems that RnW is buffered through an LS11 before it hits the 1MHz bus, additionally the timing setup involves 2 LS74s instead of one, and a strange setup with nNMI that I'm not quite unde...
by danielj
Mon Jan 30, 2012 6:07 am
Forum: hardware
Topic: Master ROM carts....
Replies: 13
Views: 1167

Re: Master ROM carts....

AFAIK this was an electron specific piece of hardware. Can't necessarily pin the situation you're seeing on it, but RnW is on a different pin on the elk, so of its using writes to ram its not going to work on the Master unless they're taking RnW from pin A11 on the slot.

d.
by danielj
Sun Jan 29, 2012 9:49 am
Forum: past events & exhibitions
Topic: Homebrew Gaming Weekend / 27-29 Jan 2012 / M'cr
Replies: 53
Views: 7435

Re: Homebrew Gaming Weekend / 27-29 Jan 2012 / M'cr

Hello,
Great to finally put some faces to names and see everyone. Shall be popping back down briefly just after 12ish.

d.
by danielj
Fri Jan 27, 2012 9:12 pm
Forum: acorn atom
Topic: Atomic JetSet Miner...
Replies: 28
Views: 3760

Re: Atomic JetSet Miner...

Resurrecting an old thread - I think I've found another bug in ATOMMMC? If you try and *RUN a file from within a basic program you get the response "SYN" and it doesn't work....

Any ideas? I promise I'll stop trying to do awkward things with it shortly...

d.
by danielj
Fri Jan 27, 2012 8:43 pm
Forum: past events & exhibitions
Topic: Homebrew Gaming Weekend / 27-29 Jan 2012 / M'cr
Replies: 53
Views: 7435

Re: Homebrew Gaming Weekend / 27-29 Jan 2012 / M'cr

BeebMaster wrote:The bad news is that it's started snowing.


Argh.

Actually, it's OK in Manchester at the moment. Might be 5 foot elsewhere though.
by danielj
Fri Jan 27, 2012 8:04 pm
Forum: hardware
Topic: Tinkering....
Replies: 107
Views: 8471

Re: Tinkering....

:D Your input's been really helpful Alan, it's very much appreciated - as has yours Martin. I really am going from no knowledge with this, I've tied a few things to an arduino in the past, but not really got into working out anything from scratch. What's very apparent to me now is that both of the c...
by danielj
Fri Jan 27, 2012 2:27 pm
Forum: past events & exhibitions
Topic: Homebrew Gaming Weekend / 27-29 Jan 2012 / M'cr
Replies: 53
Views: 7435

Re: Homebrew Gaming Weekend / 27-29 Jan 2012 / M'cr

I should add, for anyone coming along, that you can get a discount on the beer in there if you're a CAMRA member. I think they do a student discount too.

I'll pop down at midday.

d.
by danielj
Fri Jan 27, 2012 12:53 pm
Forum: hardware
Topic: Tinkering....
Replies: 107
Views: 8471

Re: Tinkering....

Is using this IC a better idea than hooking through another ls74 I guess it depends on the particular application but I used to use them a lot in similar projects because you can 'tune' a few signals with the one chip. I didn't think to check whether they're still feely available though, someone on...
by danielj
Fri Jan 27, 2012 11:52 am
Forum: hardware
Topic: Tinkering....
Replies: 107
Views: 8471

Re: Tinkering....

If you can cope with another chip, an effective route to fixed delays is to use gate delay elements. The 7431 would be your friend here :wink: sn74ls31.zip I think I probably can :D - the prototype is rather IC heavy but I can slim it all down rather well for the actual thing. Is using this IC a be...
by danielj
Fri Jan 27, 2012 7:12 am
Forum: hardware
Topic: Tinkering....
Replies: 107
Views: 8471

Re: Tinkering....

Looking a bit further, I think you're right though Alan, nINFC/nINFD need to cleaned up before going into the address selection logic as the buffer gets spuriously activated by the extra pulses which might be causing some of the problems (it certainly shows a dirty big spike on the activation line w...
by danielj
Thu Jan 26, 2012 11:15 pm
Forum: hardware
Topic: Tinkering....
Replies: 107
Views: 8471

Re: Tinkering....

Thanks again Alan. I've had a good poke with the scope at this now, and then a look back at the beeb AUG. It seems the BBC does exactly the same thing when it stretches its clock to sync with the 1MHz bus - you end up with 1:3 low:high. According to that the addresses don't become unknown, but they ...
by danielj
Thu Jan 26, 2012 9:20 pm
Forum: hardware
Topic: Tinkering....
Replies: 107
Views: 8471

Re: Tinkering....

AlanD wrote:
this is a probelm if the peripheral needs the address and data to be valid for the whole 500ns

That really does, crystal clear. Many thanks. What would happen if I timed the 1MHz signal 1:3? Or realistically should the address/data lines be latched?

Cheers,
Daniel.

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