Search found 241 matches

by scruss
Sun Jul 05, 2020 7:14 pm
Forum: off-topic
Topic: Rapid not selling 60/40 to general punters anymore?
Replies: 10
Views: 241

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: 9
Views: 208

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: 10
Views: 241

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: 987

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: 987

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: 173
Views: 3991

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: V1.22.6 released
Replies: 1127
Views: 67256

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: 325

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: 325

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.
by scruss
Wed Jun 24, 2020 7:50 pm
Forum: 8-bit acorn emulators
Topic: Is Horizon a dirty word hereabouts?
Replies: 11
Views: 1531

Re: Is Horizon a dirty word hereabouts?

I am not sure why he keeps printing what is only a lie: "Horizon cannot run without a copy of the original BBC Model B ROM. This is copyrighted software and thus not included with the emulator. Do not ask me to send you a copy of this file." That used to be true, a long time ago. Somewhere I still ...
by scruss
Tue Jun 23, 2020 11:51 pm
Forum: general
Topic: Apple goes ARM
Replies: 31
Views: 1107

Re: Apple goes ARM

Richard Russell wrote:
Tue Jun 23, 2020 7:30 pm
… they simply won't be able to compete where high-accuracy numeric calculations are concerned.
Curiously, all the recent effort in floating point are much lower precisions, like Bfloat16. ARM A64 supports this tiny float format.
by scruss
Tue Jun 23, 2020 3:40 pm
Forum: general
Topic: Apple goes ARM
Replies: 31
Views: 1107

Re: Apple goes ARM

Ramtop wrote:
Tue Jun 23, 2020 1:33 pm
My suspicion is this has more to do with Apple having gaining control over a critical part of their designs then outright performance.
Yes, that one. Finally being able to unify iOS and MacOS. Lock down hardware the way that Apple wants. Third party apps? Maybe, in a suitably walled garden.
by scruss
Mon Jun 22, 2020 11:51 pm
Forum: off-topic
Topic: 3D printing advice
Replies: 173
Views: 3991

Re: 3D printing advice

It's all the folks printing medical facemasks that puts filament in short supply. Amazon Basics use to come in a bunch of useful colours
by scruss
Mon Jun 22, 2020 11:49 pm
Forum: 8-bit acorn software: other
Topic: PLOTMATE A4 software
Replies: 36
Views: 2770

Re: PLOTMATE A4 software

The usual way to revive water-based markers is to leave the felt reservoir in a glass of water for an hour or two. It wastes very little colour.

But 9.5 mm OD is not much bigger than a pencil, so hard to fit a regular pen inside that
by scruss
Mon Jun 22, 2020 4:17 pm
Forum: 8-bit acorn software: other
Topic: PLOTMATE A4 software
Replies: 36
Views: 2770

Re: PLOTMATE A4 software

Those look just too narrow to make 3d printed collars for regular markers or ballpoints, although I hope not. Old plotter pens - even easy-to-get ones like HP - are a pain.
by scruss
Mon Jun 22, 2020 4:04 pm
Forum: off-topic
Topic: 3D printing advice
Replies: 173
Views: 3991

Re: 3D printing advice

The orange is not bad. Bright, yes, but quite warm. Prusa uses their signature orange PET-G for their machines. Amazon Basics is perfectly fine. Every school I know uses it. It's a decent, middle of the road PLA. It's not super tough, but can give a nice finish. I'm not sure if there's a Cura preset...
by scruss
Mon Jun 22, 2020 12:27 am
Forum: off-topic
Topic: 3D printing advice
Replies: 173
Views: 3991

Re: 3D printing advice

I've been guarding the spool of Prusa PLA I got with my printer last year. There's still about ⅕ left. It's really good. It's probably much cheaper in the UK than here, too.

It prints hot and fast for a really nice surface finish.
by scruss
Sun Jun 21, 2020 1:42 pm
Forum: off-topic
Topic: 3D printing advice
Replies: 173
Views: 3991

Re: 3D printing advice

Yes, I know about the CR6 Meanwell PSU brouhaha, even being outside the Kickstarter drama. They're hard to make CE/UL compliant because they're considered a component. Without a proper case they have exposed mains terminals, so they wouldn't be considered safe on their own. The other problem is knoc...
by scruss
Sat Jun 20, 2020 10:39 pm
Forum: off-topic
Topic: 3D printing advice
Replies: 173
Views: 3991

Re: 3D printing advice

It's not that Meanwell PSUs are quiet: it's that they've got at least a nod towards electrical safety. Some of the others, random shorts and overheating is the order of the day. I see All3DP are maintaining usual reviewer quality control in say that the Ender 3 v2 has a "“silent” 32-bit motherboard ...
by scruss
Sat Jun 20, 2020 12:21 am
Forum: 8-bit acorn software: other
Topic: PLOTMATE A4 software
Replies: 36
Views: 2770

Re: PLOTMATE A4 software

I think you're right - dunno what possessed me to say that they were. Sorry.
cy14.jpg
They look a lot more like Calcomp pens, if that drawing from Graphic Controls is accurate.
by scruss
Thu Jun 18, 2020 2:35 pm
Forum: 32-bit acorn software: other
Topic: Reading BBC Basic files on Linux
Replies: 20
Views: 721

Re: Reading BBC Basic files on Linux

whoops, didn't mean to make more work for you. I may have cherry-picked a demo that seemed to work. Details have never been my strong point
by scruss
Sun Jun 07, 2020 1:47 am
Forum: scanning of books, magazines, ads and letters
Topic: Personal Computer World scans!
Replies: 58
Views: 1793

Re: Personal Computer World scans!

Out of interest, which is the earliest PCW magazine to feature the BBC Micro ? That would be December 1981: https://archive.org/details/PersonalComputerWorld1981-12/mode/2up Seriously, though, I'd hang about until they've all finished deriving the "PDF with Text" versions. The initial PDFs are gian...
by scruss
Sat Jun 06, 2020 9:27 pm
Forum: off-topic
Topic: 3D printing advice
Replies: 173
Views: 3991

Re: 3D printing advice

Something like this? :shock: Aaagh! Anything but that! Horrid memories of a summer faire in Hemel Hempstead in 1993 … Cura's decent, but very large now. The stock profiles - especially if they're marked as developed by the manufacturer - are usually better than anything you can fiddle with, contrar...
by scruss
Sat Jun 06, 2020 9:11 pm
Forum: scanning of books, magazines, ads and letters
Topic: Personal Computer World scans!
Replies: 58
Views: 1793

Re: Personal Computer World scans!

Something's gone wrong with the February 1980 upload: Yeah, that can happen. If you've pinged someone at archive.org, they'll get to it eventually. If an item says it's deriving, best to leave it alone until it's clearly finished. That can be a week. Their servers are constantly slammed at the mome...
by scruss
Fri Jun 05, 2020 2:35 pm
Forum: scanning of books, magazines, ads and letters
Topic: Personal Computer World scans!
Replies: 58
Views: 1793

Re: Personal Computer World scans!

leenew wrote:
Fri Jun 05, 2020 11:56 am
Secondly, how on earth do you go about inserting them into place?
Only the uploader can do that, by deleting and re-uploading the modified PDF.
by scruss
Wed Jun 03, 2020 9:11 pm
Forum: scanning of books, magazines, ads and letters
Topic: Personal Computer World scans!
Replies: 58
Views: 1793

Re: Personal Computer World scans!

Sorry about my delayed reply yesterday: work got in the way! I just tried using the commandline to tool to rename one of the files I'd already uploaded, but although the PDF filename seems to have been changed from 1978-10.pdf to pcw1978-10.pdf, the preview has disappeared, and the derive task is ta...
by scruss
Wed Jun 03, 2020 4:36 pm
Forum: off-topic
Topic: Advice wanted on ATTINY 2313 dev
Replies: 8
Views: 290

Re: Advice wanted on ATTINY 2313 dev

What will you be using as the hardware programmer? An Arduino works in a pinch: ArduinoNanoISP-ATtiny85.jpg (shown programming an ATtiny85, but the 2313 has similar connections) Not sure if this or the other "hack" ways of programming (like USBtinyISP ) handle debugging. The official MicroChip AVR p...
by scruss
Wed Jun 03, 2020 1:39 am
Forum: scanning of books, magazines, ads and letters
Topic: Personal Computer World scans!
Replies: 58
Views: 1793

Re: Personal Computer World scans!

Hey - not bad! It looks great! There's definitely something up with the PDF encoding of Issue 1. 65 pages should not be 768 MB at any useful resolution! But I understand (?) that you've received these scans from someone else so you don't have any control of the input. The colossal file size may be p...
by scruss
Sat May 30, 2020 6:09 pm
Forum: off-topic
Topic: 3D printing advice
Replies: 173
Views: 3991

Re: 3D printing advice

There is certainly a lot of emotion involved about whether direct drive or Bowden is best. But hybrid solutions like zesty nimble will solved that debate. Ooh, I saw them at MRRF last year. Looks like it adds a whole lot of backlash, because that torque cable and gearbox has a bunch of windup, and ...
by scruss
Sat May 30, 2020 12:49 am
Forum: off-topic
Topic: 3D printing advice
Replies: 173
Views: 3991

Re: 3D printing advice

The Teflon tube not just reduces oozing, but it also prevents the warm (but not quite melted) filament from sticking inside the hotend. All-metai requires an incredibly smooth inner bore, so they are much more expensive to make. I really don't think you'll find a 3d printing forum like Stardot, as t...

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