stardot.org.uk

Given that this thread has been inactive for a couple of months I thought I'd better point out that the problem is still there when using Edge.

Alan

Also be aware that if you fit the 1K0 resistor then playing back audio through the 1MHz bus will be affected (e.g. BeebSID will be silent except via its external audio output). The resistor is a kind of sideways boosting of the signal from one part of the audio stage to another and you may therefore...

MartinB wrote: ↑

Tue Jan 22, 2019 9:00 pm

In Edge under Windows 10 (and probably other OS), you can just Right-Click on the [Download] box and select 'Save Target as'

Though that works with Firefox, using Edge the filetype is then set to HTML despite it being an ssd file.

I'd have used them a lot more out-of-the-box for experimental data capture and analysis if they'd had a 16 bit ADC as standard. When I saw the subject line I thought it was going to be an I'm Sorry I Haven't A Clue one letter changing round, half expecting to see the BBC Yodel B, BBC Easter and Acor...

Ah, good, ta. It sounds like I can put my feet up. Your comment does remind me, though, of an old SF programme where someone needed "an extremely fine pair of brain tweezers".

Alan

Attempting to answer all the points, I don't know whether it works yet as I'm still waiting for the thing that plugs into it to arrive. It's not just the gold plating that's missing, it's the underlying copper as well. I've heard horror stories when people have tinned such pads so I've always avoide...

Thanks for the reply. Such a simple question but it meant a 95% dismantle of the kit. I've attached the best I can do with the cameras I have. As you can see there is some nibbling-n at the side of one of the pads. You may also see a horizontal hairline break of the pad across most of the width. The...

I've a piece of retro kit where a couple of PCB edge card connector pads have been over-etched on one side, possibly because they're adjacent to a notch. The pads are gold plated. What paint/pen/etc product would people here recommend (and how many coats) to patch them up a bit?

Alan

It is more likely IMHO to be leeching-out of a plastic additive, possibly a softener, and subsequent recrystallisation on the polymer surface. The thinking behind that is that a fungus would require a food source (including trace compounds) and moisture to survive. The computers mentioned all seem t...

Advertised for cleaning Epson printer heads:

https://www.ebay.co.uk/itm/Eco-Solvent- ... 2496527164

Nowhere near a sideways scroller, but some might say that Lemmings would be a very easy conversion for you given that many of the levels already say "tricky".

The WDC W65C22S6TPG-14 is a CMOS chip for new designs, as the interrupt pin (IRQB) output is a totem pole type which should not be directly connected to existing circuit designs if more than one device is connected to the CPU's interrupt input. The WDC W65C22N6TPG-14 is also a CMOS chip, but design...

Today I received the best cheap Signal Gen my budget would stretch to ... Very useful pieces of kit. One slight problem to be aware of with a lot of these things is that you can get AC line voltages on the outside of the BNC connectors because of the floating switch mode power supplies used. That c...

Odd indeed.
It looks like a ROM socket for a Solidisk SWR card without its cable. In which case it seems rather out of place with a Master.

Alan

I first encountered it in use in the late 1980's to early 1990's in RF tuners used in Satellite Receivers. It also started appearing in other consumer "brown" goods like TV's in the 1980s. I'm sure I remember an article in the TV trade magazine 'Television'. Mark Excellent memory. That was probably...

Here are the results I achieved using the Brillo Bone colour vinyl dye from vinyldye.co.uk. This isn't a recommendation one way or the other, it's entirely your responsibility whether you do the same. I also apologise for the photo quality - what my cameras lack in picture quality is more than match...

How well does vinyl dye cover? Can you do black over cream ABS, or bone over black ABS, without it looking patchy? Their blurb says that a 150ml aerosol can will do 1 to 1.5 square metres with 3 fine coats and that it usually takes 3 or 4 fine coats to do the job. Their site shows how someone dyed ...

Is it the head moving to the disc then? It was the familiar clunk when you start accessing something. Anyway I thought it was weird. If it's the familiar healthy-sounding clunk then that's very likely to be the head-loading solenoid making the noise. The other possibility posted by Mark usually giv...

Sorry I know this thread is a couple of months old now but did you or anyone else try vinyl dye? I have a Micro ready for retrobriting but I'm leaning towards dyeing it instead as it's more permanent / even but unsure of the colour needed (white, bone etc) I decided to give it a while to see whethe...

Disc drives for the BBC computers have an electronic track 0 sensor and so don't bang the heads against a stopper. That was only done on the Commodore 1541 drives AFAIK. I suppose it's possible it might happen if there was a problem with the track 0 sensor circuitry but it seems very unlikely in you...

Impressive peroxy acid job. Do you varnish things afterwards (if so what make/type). I may get the marigolds out again, however I don't wish to hijack my own thread so am still dyeing (apologies) to hear peoples' experiences with original-look paint.


Alan

Thanks both. I RetroBrited both my Masters last summer and they turned out pretty well. However, they've subsequently re-oxidised, even though they've been kept away from direct sunlight. It seems they do, as some say, need a protective varnish; in effect a paint job. That's why I'm interested in ex...

I picked up a couple of empty Master 128 cases last year. Both are very yellowed. One of them has obviously had something with a straight edge put on top such that half the case is yellow and the other cream. I suspect that such a two-tone case will not respond well to RetroBrite treatment, even mul...

Apologies for the iffy etiquette (replying to my own post), however the problem is now solved. Having found a better schematic it appears that the resistor is a feedback method to boost sound originating from the BBC synth chip at the expense of other audio inputs. Removing the resistor re-enables a...

I've recently built a BeebSID (v2.4 PCB) and it works splendidly using its phono jack output. However, after closing the 1MHz bus audio output jumper, I get no SID output from the internal speaker route. The machine in question is a Master 128. The audio output is fine for BBC-generated sounds (e.g....

Is the V2.3 parts list still current? I can't answer that directly, however the notes in the schematic don't indicate any value changes (and neither does the posting at the start of this thread). I'm working from an excel-format Bill of Materials (parts list) file produced after importing the Eagle...

2x Reco6502Mini
2x Pi Zero + Kjell adapter + PiTubeDirect

Alan

It's a great credit to this group that the thread has got this far without anyone making a 'Port noICE Complaint'.

Alan

Are there any preferred memory locations whose contents would be suitable for a RNG seed value in assembler? The RNG routines I've implemented handle a 32 bit seed value but, for the application I'm currently writing, I could get away with a 16 bit value; the more the merrier though. Compatibility a...

Hi,

Aye, I'd probably end up writing one if I had such a beast, looks like an interesting processor.
I was going to look at what C compilers there were available for the BBC. I seem to recall
there was a multi-ROM one yonks ago. There's cc65 out there still - must look at it; who needs floats.

Alan