Search found 42 matches

by roganjosh
Mon Apr 01, 2019 8:57 pm
Forum: bbcmicro.co.uk
Topic: Downloading ssds
Replies: 19
Views: 707

Re: Downloading ssds

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
by roganjosh
Wed Mar 13, 2019 3:36 pm
Forum: hardware
Topic: Master audio noise
Replies: 13
Views: 254

Re: Master audio noise

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...
by roganjosh
Tue Jan 22, 2019 10:52 pm
Forum: bbcmicro.co.uk
Topic: Downloading ssds
Replies: 19
Views: 707

Re: Downloading ssds

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.
by roganjosh
Tue Dec 25, 2018 9:14 pm
Forum: general
Topic: Bit of fun - One change only
Replies: 82
Views: 2477

Re: Bit of fun - One change only

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...
by roganjosh
Sat Dec 22, 2018 3:42 pm
Forum: hardware
Topic: Over-etched pads
Replies: 8
Views: 252

Re: Over-etched pads

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
by roganjosh
Sat Dec 22, 2018 3:09 pm
Forum: hardware
Topic: Over-etched pads
Replies: 8
Views: 252

Re: Over-etched pads

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...
by roganjosh
Sat Dec 22, 2018 2:01 pm
Forum: hardware
Topic: Over-etched pads
Replies: 8
Views: 252

Re: Over-etched pads

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...
by roganjosh
Sat Dec 22, 2018 9:50 am
Forum: hardware
Topic: Over-etched pads
Replies: 8
Views: 252

Over-etched pads

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
by roganjosh
Thu Dec 13, 2018 8:49 am
Forum: hardware
Topic: White stuff on pin connectors and jumpers
Replies: 12
Views: 429

Re: White stuff on pin connectors and jumpers

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...
by roganjosh
Wed Dec 12, 2018 7:45 am
Forum: off-topic
Topic: LOLPRICE
Replies: 2916
Views: 251168

Re: LOLPRICE

Advertised for cleaning Epson printer heads:

https://www.ebay.co.uk/itm/Eco-Solvent- ... 2496527164
by roganjosh
Mon Dec 03, 2018 4:10 pm
Forum: software: classic games
Topic: what should i write next?
Replies: 204
Views: 17634

Re: what should i write next?

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".
by roganjosh
Sat Nov 03, 2018 10:10 am
Forum: hardware
Topic: This is not a language
Replies: 68
Views: 1923

Re: This is not a language

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...
by roganjosh
Sat Sep 15, 2018 8:57 am
Forum: general
Topic: Today I received.....
Replies: 5108
Views: 375631

Re: Today I received.....

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...
by roganjosh
Mon Sep 10, 2018 9:35 am
Forum: hardware
Topic: STL mini cart
Replies: 2
Views: 150

Re: STL mini cart

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
by roganjosh
Sat Sep 08, 2018 9:28 pm
Forum: hardware
Topic: I2C 4 U
Replies: 384
Views: 23683

Re: I2C 4 U

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...
by roganjosh
Tue Aug 07, 2018 12:53 pm
Forum: general
Topic: Master spray job
Replies: 17
Views: 981

Re: Master spray job

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...
by roganjosh
Thu Aug 02, 2018 5:30 am
Forum: general
Topic: Master spray job
Replies: 17
Views: 981

Re: Master spray job

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 ...
by roganjosh
Wed Aug 01, 2018 10:07 pm
Forum: hardware
Topic: BBC Master weirdness
Replies: 6
Views: 654

Re: BBC Master weirdness

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...
by roganjosh
Wed Aug 01, 2018 9:58 pm
Forum: general
Topic: Master spray job
Replies: 17
Views: 981

Re: Master spray job

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...
by roganjosh
Fri Jul 13, 2018 5:57 pm
Forum: hardware
Topic: BBC Master weirdness
Replies: 6
Views: 654

Re: BBC Master weirdness

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...
by roganjosh
Thu May 31, 2018 12:31 pm
Forum: general
Topic: Master spray job
Replies: 17
Views: 981

Re: Master spray job

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
by roganjosh
Wed May 30, 2018 4:37 pm
Forum: general
Topic: Master spray job
Replies: 17
Views: 981

Re: Master spray job

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...
by roganjosh
Wed May 30, 2018 7:25 am
Forum: general
Topic: Master spray job
Replies: 17
Views: 981

Master spray job

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...
by roganjosh
Sun May 06, 2018 8:57 am
Forum: hardware
Topic: BeebSID and 1MHz bus silence
Replies: 2
Views: 336

Re: BeebSID and 1MHz bus silence

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...
by roganjosh
Sat May 05, 2018 7:56 pm
Forum: hardware
Topic: BeebSID and 1MHz bus silence
Replies: 2
Views: 336

BeebSID and 1MHz bus silence

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....
by roganjosh
Sat Apr 14, 2018 8:11 pm
Forum: hardware
Topic: BeebSID 2.4 design files.
Replies: 31
Views: 2221

Re: BeebSID 2.4 design files.

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...
by roganjosh
Fri Oct 13, 2017 8:31 am
Forum: hardware
Topic: 6502 second processor poll
Replies: 40
Views: 2801

Re: 6502 second processor poll

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

Alan
by roganjosh
Tue May 30, 2017 8:42 am
Forum: hardware
Topic: 6809 experiments
Replies: 137
Views: 10780

Re: 6809 experiments

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

Alan
by roganjosh
Wed May 17, 2017 7:16 am
Forum: software: other
Topic: RNG seed
Replies: 0
Views: 415

RNG seed

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...
by roganjosh
Wed Mar 29, 2017 7:48 pm
Forum: software: other
Topic: Macro Assembler (MASS)
Replies: 2
Views: 695

Re: Macro Assembler (MASS)

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