Search found 293 matches

by scruss
Sat Nov 28, 2020 4:56 am
Forum: other vintage hardware, software and languages
Topic: Dragon 32 Loading from Mobile Issue
Replies: 7
Views: 468

Re: Dragon 32 Loading from Mobile Issue

If you've got no power connection from the phone, you can try this differential volume method. It requires a stereo cable.
by scruss
Fri Nov 27, 2020 6:31 pm
Forum: 8-bit acorn software: other
Topic: Why was BBC BASIC so fast?
Replies: 188
Views: 6711

Re: Why was BBC BASIC so fast?

Oh, I know - all synthetic benchmarks are rigged in some way towards the developer's needs. So rather than being a general purpose BASIC benchmark, ClkSpd is useful for comparing BBC BASIC implementations running on Acorn 8-bit hardware. From (possibly faulty) memory, the Amstrad CPC CP/M implementa...
by scruss
Fri Nov 27, 2020 3:56 pm
Forum: other vintage hardware, software and languages
Topic: GEM and the Apple Lisa
Replies: 11
Views: 451

Re: GEM and the Apple Lisa

cheesey wrote:
Fri Nov 06, 2020 3:05 pm
… some early Atari software works adequately, if it's well behaved.
Wow, those are neat! I wonder how much of DR's GEMDOS 68K demoed on the Lisa helped Atari along?
by scruss
Fri Nov 27, 2020 4:40 am
Forum: 8-bit acorn software: other
Topic: Why was BBC BASIC so fast?
Replies: 188
Views: 6711

Re: Why was BBC BASIC so fast?

… leaving interrupts enabled is a fairer comparison anyway. Absolutely! A system without interrupts isn't a fair comparison. Also, the correction for CPU speed seems only to scale on one part of the code: a simple integer REPEAT loop near the start. This means that the results are quite inaccurate ...
by scruss
Tue Nov 17, 2020 1:19 pm
Forum: 8-bit acorn software: other
Topic: Why was BBC BASIC so fast?
Replies: 188
Views: 6711

Re: Why was BBC BASIC so fast?

Was it BBC BASIC (Z80) v2 or v3? Amstrad BBC BASIC v2.3, run from an image on this rather noisy page: amstrad bbc basic version 2.30 © timatic systems ltd (1986) . That boots into CP/M+, so is clearly not from an original disk. … So you can blame Clive Sinclair for BBC BASIC (Z80) slowing down slig...
by scruss
Tue Nov 17, 2020 2:55 am
Forum: 8-bit acorn software: other
Topic: Why was BBC BASIC so fast?
Replies: 188
Views: 6711

Re: Why was BBC BASIC so fast?

It's in this very thread! Here's a direct link to the post containing the listing; Coeus used it in his post listing the 'reference' Z80 Second Processor results from B-Em. Okay, so running this in Arnold (which is fairly accurate to the 3.3 MHz effective clock on an Amstrad CPC) I got this: Screen...
by scruss
Tue Nov 17, 2020 1:34 am
Forum: 8-bit acorn software: other
Topic: Why was BBC BASIC so fast?
Replies: 188
Views: 6711

Re: Why was BBC BASIC so fast?

The Model 100 basic is one of Microsoft's weird diversions into BCD floating point. It's slow, but at least it passes Roger Broucke's test:

Code: Select all

10 S=0
20 X=0
30 FOR N=1 TO 1000
40 S=S+X*X
50 X=X+0.00123
60 NEXT N
70 PRINT S,X
80 PRINT "CORRECT RESULT: 503.54380215, 1.23"
by scruss
Sun Nov 15, 2020 1:41 am
Forum: 8-bit acorn software: other
Topic: Why was BBC BASIC so fast?
Replies: 188
Views: 6711

Re: Why was BBC BASIC so fast?

Richard Russell wrote:
Sat Nov 14, 2020 10:09 pm
You are running the old version of ClockSp in which the 'real' measurements are nothing of the sort …
· I'm running the same version as jimmy.
· It's also the same version on JGH's site and in the beebjit emulator
· The really real version isn't anywhere I can find.
by scruss
Sat Nov 14, 2020 9:08 pm
Forum: general
Topic: DOS vs UNIX Line Endings
Replies: 21
Views: 464

Re: DOS vs UNIX Line Endings

See https://github.com/SteveFosdick/Utils The utilities txt2bbc, txt2cpm, and txt2dos all write files with the corresponding line ending … Thanks. I've been making do with an awk one-liner and requiring LF eols because who wouldn't? awk '{printf("%s\r\n", $0);} END {printf("%c", 26);}' And every co...
by scruss
Sat Nov 14, 2020 8:48 pm
Forum: 8-bit acorn software: other
Topic: Why was BBC BASIC so fast?
Replies: 188
Views: 6711

Re: Why was BBC BASIC so fast?

Hmm, BBC BASIC for Amstrad CPC (v2) turns in some dismal but not unexpected numbers: clocksp-v2.png The CPC's clock ran at an effective 3.3 MHz, so I might expect slightly slower numbers than the ZX Spectrum. Despite the slowness, the Amstrad completed the test in 56 s, while a BBC might do it in ar...
by scruss
Sat Nov 14, 2020 6:13 pm
Forum: off-topic
Topic: Soldering help - tip shaft sizes.
Replies: 8
Views: 267

Re: Soldering help - tip shaft sizes.

There is a semi-standard for these tips, but it depends if the tip unscrews or is just a push-fit. To be honest, I've only ever seen 45° conical and large bevel tips for those irons: probably too large for your needs. I had one like that but the tip plating was bad, so the solder corroded through th...
by scruss
Sat Nov 14, 2020 5:53 pm
Forum: general
Topic: DOS vs UNIX Line Endings
Replies: 21
Views: 464

Re: DOS vs UNIX Line Endings

Or is there a way on a Linux text editor (Kate, Gedit etc) for me to specify my own (per-file preferably) line endings so I can just use the "BM Standard" of ASCII 13? Kate claims to have line ending auto detection , but I've never used it. Gedit (3.36.2, at least) silently keeps whatever line endi...
by scruss
Thu Nov 12, 2020 1:33 am
Forum: off-topic
Topic: 3D Printer
Replies: 6
Views: 258

Re: 3D Printer

by scruss
Sun Nov 08, 2020 6:14 pm
Forum: off-topic
Topic: 3D Printer
Replies: 6
Views: 258

Re: 3D Printer

Depends on what you want to do with it. If cheap is important to you, you may have to accept some limitations. For work I use a Prusa i3 MK3s: reliable, quiet, fast, great print quality, not cheap . I also use a Creality Ender-3: cheap, mostly reliable, decent print quality, slower, loud . I've also...
by scruss
Mon Nov 02, 2020 8:59 pm
Forum: introduce yourself
Topic: Greetings from Toronto!
Replies: 17
Views: 515

Re: Greetings from Toronto!

Welcome! I'm a bit late, I know I think I know of about 5 other BBC Micros / Masters + one Acorn A7000 in and around Toronto. I don't have one, and probably shouldn't be encouraged to get one. East York District School Board (now part of Toronto) apparently specified and used North American spec Bee...
by scruss
Sat Oct 31, 2020 11:42 pm
Forum: other vintage hardware, software and languages
Topic: Fairlight CMI
Replies: 13
Views: 582

Re: Fairlight CMI

Enjoy the 6800-ness!

(who also works in bermondsey, but the one in Toronto, so named for the Peek Freans cookie factory)
by scruss
Sat Oct 31, 2020 1:52 am
Forum: off-topic
Topic: 3D printing advice
Replies: 235
Views: 12112

Re: 3D printing advice

… Unprotected USB +5v rail allowing back current from a connected device like a Pi or PC (common issue with Chinese 3D printers, just need to blank or cut the USB +5v line on the cable) Every 3D printer I've ever had does that, including the genuine Prusa and an old PrintrBot. It's a function of us...
by scruss
Sat Oct 24, 2020 3:55 am
Forum: 8-bit acorn software: other
Topic: Why was BBC BASIC so fast?
Replies: 188
Views: 6711

Re: Why was BBC BASIC so fast?

Microsoft Basic had build-time options and offered either 32 or 40 bit floats. I've seen both, I think, on different machines. It gets weirder: they also had 32 and 64-bit decimal float interpreters. I don't know if any of them hit the 6502, but MSX BASIC was perhaps the most widely-used MS BASIC w...
by scruss
Sun Oct 11, 2020 3:36 pm
Forum: 8-bit acorn hardware
Topic: Saa5050 tinkering
Replies: 3
Views: 248

Re: Saa5050 tinkering

It's a SAA5246, but there's always the Teletext Experimenter’s Board
by scruss
Tue Sep 29, 2020 2:16 am
Forum: past physical ABug events
Topic: ABUG Canada West Sept 25 2020 Meetup Meeting #19
Replies: 6
Views: 379

Re: ABUG Canada West Sept 25 2020 Meetup Meeting #19

KarateEd wrote:
Mon Sep 28, 2020 10:48 pm
Also, you can see in the room a monitor with a picture of a computer on it. Can you recognize it? I have one coming within a couple of weeks or so.
Ah, a NeXT. *. user waltermixx has one.
by scruss
Mon Sep 28, 2020 5:25 pm
Forum: past all-day virtual ABugs
Topic: All-day 'Virtual' Acorn session #8, Saturday 3rd October 2020, 9am - 11pm
Replies: 80
Views: 3531

Re: All-day 'Virtual' Acorn session #8, Saturday 3rd October 2020, 9am - 11pm

Me for afternoon, please.

Yes, I'll admit - it's because of Frak!
by scruss
Mon Sep 28, 2020 5:20 pm
Forum: scanning of books, magazines, ads and letters
Topic: WeServe catalogue, 15th March 1991
Replies: 7
Views: 571

Re: WeServe catalogue, 15th March 1991

No probs — it was fun (mostly). I'd manually reordered smaller booklets before, but shuffling 44 pages would've been too much of a chore. Now at least I have a script that will help reorder pages. The intermediate files can get a bit huge when dealing with scans, but Internet Archive's workflow clea...
by scruss
Sun Sep 27, 2020 2:57 am
Forum: scanning of books, magazines, ads and letters
Topic: WeServe catalogue, 15th March 1991
Replies: 7
Views: 571

Re: WeServe catalogue, 15th March 1991

Here y'go: WeServe Catalogue (UK) - 15 March 1991 . Thank you for scanning it! The file's about 10 MB now, before the Internet Archive does its magic OCR/recompression on it. I only kept colour on the front and back cover. There was a blue line on the IFC, but I don't think much is lost by clipping ...
by scruss
Thu Sep 24, 2020 6:40 pm
Forum: scanning of books, magazines, ads and letters
Topic: WeServe catalogue, 15th March 1991
Replies: 7
Views: 571

Re: WeServe catalogue, 15th March 1991

Thanks! I can run it through Scan Tailor to properly paginate it. Might not get to it immediately.
by scruss
Fri Sep 18, 2020 3:16 am
Forum: modern implementations of classic programming languages
Topic: Tyoob online! (BBC BASIC stress test)
Replies: 6
Views: 319

Re: Tyoob online! (BBC BASIC stress test)

That's really impressive, Richard!
by scruss
Tue Sep 15, 2020 3:23 am
Forum: general
Topic: ARM sold to Nvidia (by Softbank)
Replies: 6
Views: 519

Re: ARM sold to Nvidia (by Softbank)

What can they do? It's already a Japanese company, so it's already offshore.
by scruss
Fri Sep 11, 2020 11:28 pm
Forum: off-topic
Topic: 3D printing advice
Replies: 235
Views: 12112

Re: 3D printing advice

It is when you add the web cam and add lots of plugins the 2b becomes an issue. That is why the minimum recommend pi by octopi the is now a 3b. Huh, who knew. I've been running that 2B since 2016 with the camera and a non-trivial number of plugins (16) and never once has it stuttered. I find gcode ...
by scruss
Thu Sep 10, 2020 11:03 pm
Forum: off-topic
Topic: 3D printing advice
Replies: 235
Views: 12112

Re: 3D printing advice

I've sliced and streamed from a 2B quite well for some years. I no longer slice on the Raspberry Pi: it was fast enough, but changing print settings was fiddly. Also, compiling cura-steamengine or slic3r was annoying. Both Cura and Slic3r desktops have a "Slice to OctoPrint" options that are easy to...
by scruss
Mon Sep 07, 2020 4:42 pm
Forum: 8-bit acorn software: classic games
Topic: Deathstar
Replies: 16
Views: 980

Re: Deathstar

:shock: Wow, that 49-way joystick must have been a feat of engineering. Was it a custom analogue stick or a complex digital position type? Digital, as far as I can tell. It encoded on a 7×7 matrix. Similar ones are still used on certain arcade machines, plus older games like Gauntlet . They need a ...
by scruss
Mon Sep 07, 2020 1:01 am
Forum: 8-bit acorn software: classic games
Topic: Deathstar
Replies: 16
Views: 980

Re: Deathstar

English Invader wrote:
Sun Sep 06, 2020 9:46 pm
… Caps Lock and Ctrl for rotation
The original - which I played far too much of as a smaller oik - had a 49-way joystick. I'd hate to play it with asteroids-style controls.

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