Search found 821 matches

by flynnjs
Mon Feb 28, 2011 10:57 pm
Forum: acorn atom and system
Topic: Atom upgrades pt 2
Replies: 38
Views: 4870

Re: Atom upgrades pt 2

Mmm, look at those mitred corners. Not one missed! Real pride at work there :)

Jason (an OCD mitrer)
by flynnjs
Fri Feb 25, 2011 3:37 pm
Forum: wanted
Topic: 8255 + other Atom parts
Replies: 4
Views: 770

8255 + other Atom parts

Having obtained RAM, CPU and Video ICs for an Atom I'm now after an 8255 and some of the other bits and bobs. Does 81LS95 have any sane alternatives? I think I can source all the rest of the 74series stuff.
by flynnjs
Tue Feb 22, 2011 7:58 am
Forum: past events & exhibitions
Topic: Wakefield Acorn Show / 16 April 2011 / W. Yorks
Replies: 47
Views: 6439

Re: Wakefield Acorn Show / 16 April 2011 / W. Yorks

I will be at Gadget Show Live with the museum, so I cant attend. (Nor can the museum attend this year.)
Meh, 3 events to go to in one weekend. I might be there :mrgreen:
by flynnjs
Sun Feb 20, 2011 10:27 pm
Forum: past events & exhibitions
Topic: Centre for Com His / TBA 2011 / Haverhill, Suffolk
Replies: 38
Views: 5558

Re: Centre for Com His / TBA 2011 / Haverhill, Suffolk

Hmm, b/hol w/e. Not sure if I'll be able to get there. Anyway, I'll
keep monitoring the thread and flag whether I'm attending in
due course.
by flynnjs
Sun Feb 20, 2011 8:47 am
Forum: hardware
Topic: Simulating a Remote Control
Replies: 15
Views: 2057

Re: Simulating a Remote Control

will a receiver that normally expects modulation to be present be able to decode without it, i.e. just the data? Not usually. Basically, the IR signal is fed through a capacitor to block the DC component caused by ambient light. The carrier passes through this and is then demodulated, sometimes the...
by flynnjs
Sat Feb 19, 2011 11:06 pm
Forum: hardware
Topic: Simulating a Remote Control
Replies: 15
Views: 2057

Re: Simulating a Remote Control

As flynnjs pointed out BTW, I'm Jason :P BeebMaster & SirMorris (amongst others, but I include them as they are vocal on this thread) met me a Bletchley last summer. I'm sure there's plenty of help available to get this remote stuff going but I guess we need a lot more information. Beebmaster has a...
by flynnjs
Sat Feb 19, 2011 9:36 am
Forum: hardware
Topic: Simulating a Remote Control
Replies: 15
Views: 2057

Re: Simulating a Remote Control

The problem with feeding directly into an LED is that background light affects the receiver. This is usually solved by modulating a carrier with the data to be transmitted. Therefore your user port program will need to switch the transmit LED on and off quickly (to create the carrier) and then start...
by flynnjs
Wed Jan 26, 2011 10:38 pm
Forum: acorn atom and system
Topic: Acorn Atom for sale on Ebay
Replies: 7
Views: 1884

Re: Acorn Atom for sale on Ebay

Another one just gone for £144. Given the cost of obtaining the legacy parts to build one these figures aren't unrealistic. :(
by flynnjs
Mon Jan 24, 2011 9:40 pm
Forum: acorn atom and system
Topic: Atom RAM
Replies: 6
Views: 1394

Re: Atom RAM

Not sure I'd desperately want to be flogging 12 though, that's quite a lot.
Indeed. I've got a whole board to populate :-(

There's some MCM2114P45 on e-bay from .nl but only 5pcs left.

I think I'm going to have to splash out on from the USA.
by flynnjs
Sun Jan 16, 2011 9:47 am
Forum: hardware
Topic: Cleaning bbc micro
Replies: 4
Views: 1471

Re: Cleaning bbc micro

Washing the PCB is water should be OK provided you follow Mark's advice to use de-ionised/distilled water leave to dry properly before applying power. However, I wouldn't let it "soak" as there are probably devices that will degrade due to ingress if left for any duration, so just a quick rinse shou...
by flynnjs
Fri Jan 14, 2011 11:49 am
Forum: acorn atom and system
Topic: Atom RAM
Replies: 6
Views: 1394

Atom RAM

Hi all, does anyone have any tips on buying 2114s? I'm aware that the 2114L has lower dissapation and would be preferred for a fully loaded board but are there any brands that have compatibility issues with a regular Atom? I've found Intel, Toshiba, OKI, NatSemi types so far. Finally, is there anyon...