Search found 119 matches

by roganjosh
Mon Sep 10, 2018 9:35 am
Forum: hardware
Topic: STL mini cart
Replies: 2
Views: 222

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: 394
Views: 29816

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: 18
Views: 1449

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: 18
Views: 1449

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: 792

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: 18
Views: 1449

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: 792

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: 18
Views: 1449

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: 18
Views: 1449

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: 18
Views: 1449

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: 399

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: 399

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: 36
Views: 3515

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: 3360

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: 12599

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: 507

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: 764

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
by roganjosh
Wed Mar 29, 2017 6:19 pm
Forum: software: other
Topic: Macro Assembler (MASS)
Replies: 2
Views: 764

Macro Assembler (MASS)

The attached file contains my macro assembler, MASS, for the BBC Master (mass.rom) and the BBC model B (mass-b.rom). The Master version allows the extra commands and addressing mode available in the 65C12 instruction set. The ROM also contains a lightweight disassembler, DASS. Anyone doing any assem...
by roganjosh
Tue Mar 28, 2017 7:35 pm
Forum: software: other
Topic: Timefix ROM
Replies: 1
Views: 455

Timefix ROM

Attached is my Timefix ROM. Its primary purpose is to allow the date/time to be set from 1st Jan 0000 to 31st Dec 9999. I'm aware that there are things in circulation that trap OSWORD $0E and substitute "19" with "20", that others use MOSs where the offending 19 has been replaced with 20 and that th...
by roganjosh
Sun Mar 26, 2017 7:05 pm
Forum: off-topic
Topic: What is the average age on here??
Replies: 278
Views: 31377

Re: What is the average age on here??

Two fat ladies, 59.

Nurse!
by roganjosh
Sun Mar 26, 2017 3:49 pm
Forum: software: other
Topic: Advice for contributions & ports
Replies: 2
Views: 527

Re: Advice for contributions & ports

Thanks for that. I'll post them in the next few days.

Alan
by roganjosh
Sat Mar 25, 2017 4:30 pm
Forum: software: other
Topic: Advice for contributions & ports
Replies: 2
Views: 527

Advice for contributions & ports

As a relative newbie on this site I confess to being a little confused about whether it has mechanisms/procedures for submitting software produced by its members and, if so, what they are. I've tried using obvious (to me) search terms and there seems to be nothing appropriate. For example, I've just...
by roganjosh
Wed Jan 18, 2017 7:10 pm
Forum: hardware
Topic: VR1 for M128?
Replies: 2
Views: 357

Re: VR1 for M128?

Thanks for the suggestion.

Alan
by roganjosh
Mon Jan 16, 2017 6:10 pm
Forum: hardware
Topic: VR1 for M128?
Replies: 2
Views: 357

VR1 for M128?

Although I've gone for the obvious non-invasive way of adding sound volume control to my Master (via audio out) I might not have bothered if, like previous models, the M128 had a 10K preset at the LM386 input. I was just wondering whether anyone has previously come up with an elegant way of adding t...
by roganjosh
Thu Dec 15, 2016 8:26 pm
Forum: software: other
Topic: Today I hacked ...
Replies: 96
Views: 12491

Re: Today I hacked ...

For amusement value I just created a special variant of one of my disassemblers
that implements those illegal opcode mnemonics and addressing modes (attached).
I'm afraid it's no DiscDoctor or Exmon though, just a simple little tool.

Hopefully not too many typos added in doing the extension.

Alan
by roganjosh
Tue Dec 13, 2016 9:55 pm
Forum: introduce yourself
Topic: Hello from Leeds
Replies: 15
Views: 1495

Re: Hello from Leeds

Hello Martin.

I think I must have done. However, that looks like North Street and
The Eagle Tavern was nearby (one of the few pubs of the time that
sold a selection of real ales and therefore a haunt for students) which
might have fuzzed-up a few Micropower recollection neurons.

Alan
by roganjosh
Mon Dec 12, 2016 10:31 am
Forum: introduce yourself
Topic: Hello from Leeds
Replies: 15
Views: 1495

Re: Hello from Leeds

Thanks for the warm welcome & suggestions.

Alan
by roganjosh
Sun Dec 11, 2016 2:15 pm
Forum: introduce yourself
Topic: Hello from Leeds
Replies: 15
Views: 1495

Hello from Leeds

Hello. As a new member it would be churlish not to put something here, uncomfortable as it is to talk about oneself. My nostalgia trip with the BBC micro started a few weeks ago when I got a Master 128 from ebay. I used to have an updated Model A when I was a student. It was paid for by writing comm...