Search found 141 matches

by dgrubb
Thu Jun 14, 2018 8:18 pm
Forum: off-topic
Topic: ST micro ARM boards....
Replies: 10
Views: 357

Re: ST micro ARM boards....

with my AVR based arduinos I tend to generally just use plain old GCC to program the base AVR. Though that doesn't mean I couldn't be converted into using a framework as the ARM chips are somewhat more complicated than the 8 bit AVR / PIC micros. I used to be be purely a PIC user, but was deeply ag...
by dgrubb
Wed Jun 13, 2018 9:38 pm
Forum: general
Topic: How far gone must a BBC be to be unfixable?
Replies: 22
Views: 721

Re: How far gone must a BBC be to be unfixable?

steve3000 wrote:
Sat Jun 09, 2018 7:39 am
Even now I'm not sure of the full extent of damage yet, but so far repaired about 30 tracks! [...] I've learnt so much about the circuitry of the A3010 in the process, and every little improvement in function feels so rewarding! I'll get there one day :)
Highly commendable!
by dgrubb
Fri Jun 08, 2018 5:33 pm
Forum: hardware
Topic: A3000 startup procedure?
Replies: 2
Views: 95

Re: A3000 startup procedure?

Phlamethrower wrote:
Fri Jun 08, 2018 5:16 pm
On reset, MEMC maps the ROM to &00000000. The ROM code then performs a magic handshake to restore it to normal behaviour.

(See section 5.4 of the MEMC manual - http://www.home.marutan.net/arcemdocs/)
Got it. Thanks for the reference.
by dgrubb
Fri Jun 08, 2018 5:09 pm
Forum: general
Topic: How far gone must a BBC be to be unfixable?
Replies: 22
Views: 721

Re: How far gone must a BBC be to be unfixable?

With Commodore people, it seems to be when the board tracks have utterly perished. That's probably my personal limit as well. I'm game for repairing a small number of traces, but if a leaked battery has corroded through several layers and damaged a large number of traces then it's probably beyond m...
by dgrubb
Fri Jun 08, 2018 4:55 pm
Forum: general
Topic: Acorn machines in the movies / TV
Replies: 41
Views: 3723

Re: Acorn machines in the movies / TV

Believe it or not - that's my Archimedes monitor :) I was paid for the day (my 16th Birthday!) to supervise the Archimedes and show the actors how to run the programme (I didn't write it - but I did modify it to make it easier to cue and recue (it just used the space bar to change from memory). It ...
by dgrubb
Fri Jun 08, 2018 4:53 pm
Forum: hardware
Topic: A3000 startup procedure?
Replies: 2
Views: 95

A3000 startup procedure?

In the ARM2 datasheet it notes that coming out of reset the PC goes to 0x0 (RAM in the A3000 memory map) and starts loading code from there. Meanwhile, the start of ROM is mapped up at 0x3400000.

How does the A3000 startup and get to a place where it can begin executing RISC OS?
by dgrubb
Fri Jun 08, 2018 4:34 pm
Forum: off-topic
Topic: Modern mice
Replies: 19
Views: 520

Re: Modern mice

What on Earth are you doing to them? I don't think I've ever seen a mouse outright break, even the grotty cheap ones.
by dgrubb
Fri Jun 08, 2018 4:30 pm
Forum: general
Topic: Do your family and friends 'get it'?
Replies: 25
Views: 938

Re: Do your family and friends 'get it'?

My wife doesn't really get it, per se. However, she appreciates that I have a hobby which is useful ("help! The printer isn't working!", "Grandma's WiFi isn't working" etc) and which has ultimately led to a career that, while not exactly landing us in the lap of luxury, has provided me with decent j...
by dgrubb
Thu Nov 09, 2017 3:26 am
Forum: general
Topic: Acorn machines in the movies / TV
Replies: 41
Views: 3723

Re: Acorn machines in the movies / TV

Found one!

Doctor Who: Silver Nemesis (1988). Nazis hiding in South America use an Archimedes for calculating the return destination of a meteorite conveying a Time Lord super-weapon.
vlcsnap-2017-11-08-21h21m13s534.png
vlcsnap-2017-11-08-21h21m00s242.png
by dgrubb
Mon Sep 25, 2017 2:04 pm
Forum: off-topic
Topic: Cheap USB logic analyser - recommendations?
Replies: 9
Views: 917

Re: Cheap USB logic analyser - recommendations?

I've got my eyes on the Bitscope Micro . It's only six channels (plus two analogue, so eight really) and 20MHz, but it's tiny and £70. I think it'll do for a lot of stuff, and loads of people seem to like it, but I'm open to being told it's a terrible idea. (-8 I really like the builtin analog and ...
by dgrubb
Mon Sep 25, 2017 1:59 pm
Forum: off-topic
Topic: Cheap USB logic analyser - recommendations?
Replies: 9
Views: 917

Re: Cheap USB logic analyser - recommendations?

I have an Open Workbench logic sniffer and, for the price ($50), it's been a great purchase. The storage memory on it can be a little tight, but it's fully open-source and has 32 channels. Alternatively, you can go even cheaper and get a Chinese knockoff (~$15) of one of the streaming models (like t...
by dgrubb
Mon Sep 18, 2017 3:09 pm
Forum: other vintage computer hardware, software and games
Topic: SDK 85
Replies: 9
Views: 977

Re: SDK 85

I love that the "display drivers" are literally transistors driving extra current.
by dgrubb
Fri Sep 15, 2017 2:00 pm
Forum: other vintage computer hardware, software and games
Topic: Eastern Blok computers
Replies: 8
Views: 1134

Eastern Block computers

Interesting videos, thanks for sharing. I recall reading somewhere, so take with a gain of salt, that the authorities actually left the hacker scene (home micros and radio enthusiasts etc) largely alone so it was a lot more vibrant, albeit more resource constrained, than we in the West tend to assum...
by dgrubb
Mon Aug 28, 2017 3:08 am
Forum: hardware
Topic: Chipset datasheets (A3000)
Replies: 2
Views: 412

Re: Chipset datasheets (A3000)

sirbod wrote:Try the Archimedes Level Hardware section for the VLSI chipset manuals.
Terrific, cheers!
by dgrubb
Mon Aug 28, 2017 1:17 am
Forum: hardware
Topic: Chipset datasheets (A3000)
Replies: 2
Views: 412

Chipset datasheets (A3000)

I tried searching for the datasheets for the A3000 chipset (ARM2, IOC, MEMC, VIDC) but the links Google came up with were dead. I'd be very grateful if somebody could point me somewhere I can find them. Thanks!
by dgrubb
Sat Aug 19, 2017 2:36 pm
Forum: general
Topic: Mobile Unleashed
Replies: 0
Views: 434

Mobile Unleashed

I stumbled across this book while browsing around. It's a history of the ARM processor and, necessarily, a partial history of the later years of Acorn. It's probably a little lacking in the latter topic compared to some of the expert knowledge on these forums, mind, but I'm still finding it very int...
by dgrubb
Wed Jul 12, 2017 2:46 pm
Forum: off-topic
Topic: Monster 6502
Replies: 10
Views: 1375

Re: Monster 6502

It really is gorgeous. It's a great technical achievement and it just looks so slick.
by dgrubb
Wed Jul 12, 2017 2:41 pm
Forum: general
Topic: Remarkable videos recently posted on Youtube
Replies: 157
Views: 16116

Re: Remarkable videos recently posted on Youtube

I seem to remember reading a letter in Electron User from someone whose younger brother would press Break in the middle of a game to wind him up, and a design for a Break key guard made using a few bits of lego. Electron User also printed a guide for adding in a switch to toggle enabling the Break ...
by dgrubb
Thu Jun 22, 2017 5:40 pm
Forum: off-topic
Topic: My Idea of Summer Fun
Replies: 79
Views: 4122

Re: My Idea of Summer Fun

I went to a former-Poly and, although I'm somewhat biased on the matter, they had a lot of strength in their technical programs. Fortunately, I moved to the US where they aren't familiar enough with the UK system to have preconceived notions about such things. For some reason people are impressed wh...
by dgrubb
Sun Jun 18, 2017 3:03 pm
Forum: off-topic
Topic: My Idea of Summer Fun
Replies: 79
Views: 4122

Re: My Idea of Summer Fun

flaxcottage wrote:that dreaded Python, which is absolutely useless to start teaching programming
Just curious, what's the problem with Python?
by dgrubb
Tue May 23, 2017 7:48 pm
Forum: general
Topic: Acorn Mints (anybody else ever seen these?)
Replies: 5
Views: 837

Re: Acorn Mints (anybody else ever seen these?)

Rich Talbot-Watkins wrote:Mmmm, magnesium stearate.
That's my favourite magnesium!
by dgrubb
Sat May 20, 2017 6:01 pm
Forum: off-topic
Topic: Energy breakthrough : 'flammable' ice
Replies: 3
Views: 547

Re: Energy breakthrough : 'flammable' ice

I remember that book ...
by dgrubb
Thu Apr 27, 2017 3:54 pm
Forum: general
Topic: Today I built ...
Replies: 21
Views: 2126

Re: Today I built ...

Use the flux! Can't stress this enough. It looks live you've had a few problems getting the solder to flow and adhere cleanly which a touch of flux would help address. Not going to get any prizes for my soldering errr "skills" (butchery might be more apt!) but it works. :D With a little practise yo...
by dgrubb
Fri Apr 07, 2017 3:52 pm
Forum: other vintage computer hardware, software and games
Topic: Amiga youtube RetroGameModz is back!
Replies: 2
Views: 675

Re: Amiga youtube RetroGameModz is back!

Good to see him posting again. He has an amazing level of technical knowledge and practical skill and it's surprisingly engaging to watch him at work.
by dgrubb
Fri Mar 24, 2017 2:09 pm
Forum: general
Topic: Ah, Computing Britain back on BBC Player
Replies: 42
Views: 2534

Re: Ah, Computing Britain back on BBC Player

There was a complaint that kids in school were being moved away from things like BASIC and onto making spreadsheets, photo graphics and various DTP for projects. You are giving Microsoft far too much credit for this. Then came ubiquity in computers, where whole IT departments were required to maint...
by dgrubb
Thu Mar 23, 2017 7:20 pm
Forum: general
Topic: Ah, Computing Britain back on BBC Player
Replies: 42
Views: 2534

Re: Ah, Computing Britain back on BBC Player

Commie_User wrote:Though listening, I am dismayed a talking head bemoans the coming of Microsoft and the kind of dynamite productivity packages they brought.
Er, what?
by dgrubb
Fri Mar 17, 2017 7:24 pm
Forum: emulators
Topic: Arculator on Linux?
Replies: 100
Views: 7944

Re: Arculator on Linux?

Thank you very much for this information. :) So what is wrong with my ArcEm? Is it working with 64-bit Linux? I've never had issues running it under Debian Jessie for x86_64, so I'd expect it to work fine under related distros like Ubuntu, Elementary etc. get the screen Are you sure that OS ROM is ...
by dgrubb
Fri Mar 17, 2017 5:18 pm
Forum: emulators
Topic: Arculator on Linux?
Replies: 100
Views: 7944

Re: Arculator on Linux?

Yes, that I mean =1 is present but does no difference on speed.I tried also 0, 2, 4, 5, 8, 16 but nothing works. Then I'm out of ideas, sorry. By the way, your debian version didn't exits as it should, even with "kill" command. True. It needs some proper signal handling so it can shutdown things li...
by dgrubb
Fri Mar 17, 2017 4:50 pm
Forum: emulators
Topic: Arculator on Linux?
Replies: 100
Views: 7944

Re: Arculator on Linux?

bakoulis wrote:The option

Code: Select all

limit_speed 1
is present to arc.cfg file, but does no difference.
:(
Opps, my mistake:

Code: Select all

limit_speed = 1
by dgrubb
Fri Mar 17, 2017 3:15 pm
Forum: emulators
Topic: Arculator on Linux?
Replies: 100
Views: 7944

Re: Arculator on Linux?

Does the Linux version not have the "Limit speed" option that the Windows version has in the "Options" menu? It does, but ... Don't have menu at all!!! Right. The Linux version doesn't have any GUI widgets attached to it, so you don't have any menus, just the window which Allegro draws in. Fortunat...