Search found 262 matches

by scruss
Sat Aug 08, 2020 5:45 pm
Forum: introduce yourself
Topic: Hi from Montreal (via Bexhill)
Replies: 10
Views: 265

Re: Hi from Montreal (via Bexhill)

Hi from Toronto!

There's another *. user in Toronto with an Atom and *possibly* the right drives
by scruss
Fri Aug 07, 2020 3:35 am
Forum: off-topic
Topic: 3D printing advice
Replies: 197
Views: 6421

Re: 3D printing advice

Is there still a shortage in the market of good quality filament at the moment? Not really, I was just remiss in ordering it, and the 3 kg of 3D850 / 3D870 I bought is effectively useless and I have to return it. I have no PLA at work, only PET-G or loads of ancient ABS I was trying to avoid. PPE m...
by scruss
Thu Aug 06, 2020 1:08 am
Forum: off-topic
Topic: 3D printing advice
Replies: 197
Views: 6421

Re: 3D printing advice

Yes, it's the same material as the Amazon listing. But I came back to it after the weekend and it wouldn't feed even at 255 °C. I think the supplier has quality control issues, so I have to return it: I need prints that will finish without intervention. I've got so low on good filament I had to reso...
by scruss
Tue Aug 04, 2020 2:13 pm
Forum: off-topic
Topic: 3D printing advice
Replies: 197
Views: 6421

Re: 3D printing advice

International shipping is in a mess right now. I've been dealing with suppliers in China on a couple of projects and the only way to get stuff out with any kind of delivery guarantee is to pay for DHL. This is more expensive than I expect most CR6 preorders would be willing to pay, but is incredibly...
by scruss
Sun Jul 26, 2020 6:45 pm
Forum: 8-bit acorn hardware
Topic: Printing from the BBC Model B
Replies: 17
Views: 1770

Re: Printing from the BBC Model B

Not directly with a Beeb, no, but on many other "small" systems, yes. These printers work well, are often surprisingly well made (and powerful: they've typically got an ARM Cortex-M0 inside doing the clever stuff) but woefully under-documented by suppliers. There are many variants, and you typically...
by scruss
Sun Jul 26, 2020 2:22 am
Forum: development tools
Topic: Generating MODE 2 screens on a PC
Replies: 3
Views: 321

Re: Generating MODE 2 screens on a PC

I've always found ImageMagick to be unnecessarily hard to use. Far too many options, and sometimes not great output. Netpbm is what I use to dither to a limited palette. It's best to build it from source so you're not stuck with the 20+ year old version that comes packaged with most Linux distributi...
by scruss
Sun Jul 26, 2020 1:59 am
Forum: scanning of books, magazines, ads and letters
Topic: Personal Computer World scans!
Replies: 61
Views: 2534

Re: Personal Computer World scans!

What I can make out of the Space Trader code is that it seems to owe more than a bit to PCC's Star Trader
by scruss
Sun Jul 26, 2020 1:35 am
Forum: off-topic
Topic: 3D printing advice
Replies: 197
Views: 6421

Re: 3D printing advice

No, absolutely not. It's important to mark product that can be recycled, because they have to be identifiable in the waste stream. It's not marketing at all. Not everything that you put in the recycling stream gets recycled; only the materials than have a market for reuse at an economic rate get rec...
by scruss
Sat Jul 25, 2020 9:52 pm
Forum: development tools
Topic: Generating MODE 2 screens on a PC
Replies: 3
Views: 321

Re: Generating MODE 2 screens on a PC

Neat! I just found out about Dithertron, which I tried out on your image in BBC Mode 2. Here's an image uncorrected for aspect ratio:
brighton1-bbcmicro.mode2.png
brighton from Dithertron
brighton1-bbcmicro.mode2.png (16.58 KiB) Viewed 180 times
I wrote about Dithertron and its associated IDE here: viewtopic.php?f=55&t=20047
by scruss
Sat Jul 25, 2020 9:44 pm
Forum: development tools
Topic: 8bitworskhop's Dithertron - mode 2 screen generation on your browser
Replies: 1
Views: 196

8bitworskhop's Dithertron - mode 2 screen generation on your browser

I was just on a session at KansasFest (the Apple II event, usually in Kansas City) that introduced me to the very neat 8bitworkshop online IDE . While the IDE doesn't (yet!) support the Beeb, its Dithertron graphics tool does. It only generates PNG images in Mode 2 format right now, but is still pot...
by scruss
Sat Jul 25, 2020 8:02 pm
Forum: off-topic
Topic: 3D printing advice
Replies: 197
Views: 6421

Re: 3D printing advice

The Recycle symbol, in Canada at least, means "recyclable where facilities exist". It's effectively saying that the material is composed of a single polymer or material and could be included in the recycling stream. If the material were a composite (say fibre-reinforced, or the PC/ABS blend you ment...
by scruss
Sat Jul 25, 2020 7:44 pm
Forum: 8-bit acorn emulators
Topic: Choosing a copyright license for DFS image tool / BBC BASIC de-tokenizer
Replies: 21
Views: 806

Re: Choosing a copyright license for DFS image tool / BBC BASIC de-tokenizer

although even with CC0, in the UK it's very difficult to waive your moral rights. Moral rights link you to the creation of your work. While you can disclaim liability for all uses of the work you created (to the fullest extent permitted by applicable law, at least), you can't disclaim liability for ...
by scruss
Thu Jul 23, 2020 10:15 am
Forum: off-topic
Topic: 3D printing advice
Replies: 197
Views: 6421

Re: 3D printing advice

If I can get results like that on a CR6 with normally priced filament then that would be good. I'm sure it's doable. I've just cracked open a spool of locally-made low-sheen tough PLA and it's rather good. Any attempts to take pictures to show layer detail have failed for me. It's not quite matte b...
by scruss
Sun Jul 19, 2020 4:53 pm
Forum: 8-bit acorn emulators
Topic: Choosing a copyright license for DFS image tool / BBC BASIC de-tokenizer
Replies: 21
Views: 806

Re: Choosing a copyright license for DFS image tool / BBC BASIC de-tokenizer

I hadn't considered that one in detail before. Seems to strike a nice balance between freedom to use and modify, and retaining control of credit. I'd use it if I had anything worthwhile to release. As is, my code is best covered by the Sandia Message Public License (SMPL) :D Just built beebtools. Ni...
by scruss
Fri Jul 10, 2020 3:32 am
Forum: off-topic
Topic: 3D printing advice
Replies: 197
Views: 6421

Re: 3D printing advice

I watched that (or as much as I could manage). Matte black filament always hides layers. Indeed, any black filament will do this. From the print temperature (high!) it looks like it has a high pigment and filler load. Potential for nozzle wear and clogging. It's also bloody expensive and the vid say...
by scruss
Mon Jul 06, 2020 9:42 pm
Forum: 8-bit acorn emulators
Topic: Choosing a copyright license for DFS image tool / BBC BASIC de-tokenizer
Replies: 21
Views: 806

Re: Choosing a copyright license for DFS image tool / BBC BASIC de-tokenizer

To the person reusing the code, there's no practical difference between BSD 2-clause and MIT. I've seen corporate users prefer to use MIT over anything else, since it allows a company to benefit from it at no cost beyond putting a credit somewhere — and it doesn't have to be at all easy to find. So ...
by scruss
Mon Jul 06, 2020 9:41 pm
Forum: off-topic
Topic: Rapid not selling 60/40 to general punters anymore?
Replies: 17
Views: 755

Re: Rapid not selling 60/40 to general punters anymore?

Lead as a metal at typical ambient temperatures does not leach into water courses very much. The biggest problem with electronic and electrical equipment is the incorrect reprocessing that takes place (typically in third world countries). Which is why China was one of the strongest advocates for Ro...
by scruss
Mon Jul 06, 2020 2:36 pm
Forum: acorn atom and acorn system series
Topic: Connect a 80287 to a 6502 computer?
Replies: 12
Views: 538

Re: Connect a 80287 to a 6502 computer?

What about a C8231A, cost about $19,- on Ebay The 8231 is a licensed version of the AM9511. I know that for the PICAXE microcontroller, there is a floating point co processor in a DIP-8 package. That was the old Micromega uM-FPU V2 . As I said upthread, those went away when the developer died sudde...
by scruss
Mon Jul 06, 2020 2:25 pm
Forum: 8-bit acorn emulators
Topic: Choosing a copyright license for DFS image tool / BBC BASIC de-tokenizer
Replies: 21
Views: 806

Re: Choosing a copyright license for DFS image tool / BBC BASIC de-tokenizer

There's virtually no difference between the BSD 2-clause and the MIT licences, if https://choosealicense.com/appendix/ is to be believed. Neither require or even encourage share-alike. If you've previously used GPL, it sounds like sharing is important for you.
by scruss
Mon Jul 06, 2020 2:11 pm
Forum: off-topic
Topic: Rapid not selling 60/40 to general punters anymore?
Replies: 17
Views: 755

Re: Rapid not selling 60/40 to general punters anymore?

sirmorris wrote:
Mon Jul 06, 2020 1:26 pm
I know leaded comes with the caveat of impending poisoning and death but I can live with that :lol:
It's not you who has the problem. It's the folks who have to deal with your kit when it eventually gets scrapped that end up with the problem.
by scruss
Sun Jul 05, 2020 7:14 pm
Forum: off-topic
Topic: Rapid not selling 60/40 to general punters anymore?
Replies: 17
Views: 755

Re: Rapid not selling 60/40 to general punters anymore?

That's a niche take, to put it mildly. SnCu is immensely unforgiving, and would put anyone trying it for the first time off soldering for life. I don't think a regular iron would soften it, let alone let it flow. SAC305 (96½% tin, 3% silver, and ½% copper) is the lead-free solder that's closest to w...
by scruss
Sun Jul 05, 2020 6:51 pm
Forum: acorn atom and acorn system series
Topic: Connect a 80287 to a 6502 computer?
Replies: 12
Views: 538

Re: Connect a 80287 to a 6502 computer?

x87s are really tied to Intel chip internals. It may be a pleasantly futile task to try, though. Apart from the AM9511/AM9512 previously mentioned, the Motorola 68881 saw some use outside its 68k base. Apparently the Apple IIgs's maths library had support for it. The Micromega (unrelated to the 8-bi...
by scruss
Sat Jul 04, 2020 3:12 pm
Forum: off-topic
Topic: Rapid not selling 60/40 to general punters anymore?
Replies: 17
Views: 755

Re: Rapid not selling 60/40 to general punters anymore?

It's because of this: Please note: This product contains lead and rosin. As of 1st March 2018 the supply of solder containing lead at a concentration above the relevant limit as set out under Article 67 (by virtue of Annex XVII of the REACH regulation) is restricted to professional use only. We reco...
by scruss
Fri Jul 03, 2020 3:49 pm
Forum: 8-bit acorn software: other
Topic: Why was BBC BASIC so fast?
Replies: 35
Views: 1440

Re: Why was BBC BASIC so fast?

I don't have a real Z80 (or calibrated emulation) to try it on so if somebody could post the revised figures for BBC BASIC (Z80) … I tried on my 8 MHz Zeta SBC V2 , but completely forgot about the RTC patch/overlay. Without it, TIME always returns 0, and so ClockSp did a whole lot of not very much....
by scruss
Thu Jul 02, 2020 6:17 pm
Forum: 8-bit acorn software: other
Topic: Why was BBC BASIC so fast?
Replies: 35
Views: 1440

Re: Why was BBC BASIC so fast?

Not yet mentioned is the complete lack of garbage collection in BBC BASIC. String heap cleanup on other BASICs could be a real slowdown. It did mean that a BBC BASIC programmer had to be a little careful about string allocation and memory management, though. I've never tried one, but the rather rare...
by scruss
Thu Jul 02, 2020 5:58 pm
Forum: off-topic
Topic: 3D printing advice
Replies: 197
Views: 6421

Re: 3D printing advice

You're not alone in not liking Cura's interface. It was simple and clear in Cura 1.5, but in the 2.0 release and later it went all funny.
by scruss
Tue Jun 30, 2020 6:24 pm
Forum: modern implementations of classic programming languages
Topic: Matrix Brandy BASIC VI for console and SDL1.2: V1.22.7 released
Replies: 1173
Views: 75979

Re: Matrix Brandy BASIC VI for Linux with SDL: V1.22.6 released

aww, the lower-case immediate mode commands were handy. I know that BBC BASIC is traditionally all about the shouting, but I so often forget the capslock. I know I can enable them, though, so I'm just whingeing. On one of my systems, OLD is the command for LOAD.But it's a very old system: letter-num...
by scruss
Sun Jun 28, 2020 4:43 pm
Forum: 8-bit acorn hardware
Topic: Weak bits floppy disc protection: an alternate origins story on 8-bit
Replies: 5
Views: 387

Re: Weak bits floppy disc protection: an alternate origins story on 8-bit

The Apple II disk controller is very, very low level. Very much locked to the CPU. The 4am folks give hilarious commentary on the code. Sometimes they find the original author, with interesting results. Apple software was incredibly expensive, educational software even more so. So they had to use ve...
by scruss
Sun Jun 28, 2020 1:51 am
Forum: 8-bit acorn hardware
Topic: Weak bits floppy disc protection: an alternate origins story on 8-bit
Replies: 5
Views: 387

Re: Weak bits floppy disc protection: an alternate origins story on 8-bit

Weak Bits were a really big thing on the Apple II, going back to 1982 or before. It's worth checking some of the 4am crack logs (like this one: The Kingdom of Facts) for the details. It seems that Datasoft did it with a modified C64 drive attached to an Apple II.

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