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by Steve Drain
Wed May 20, 2015 12:17 pm
Forum: General discussion
Topic: Removing ports from the Pi
Replies: 7
Views: 1445

Re: Removing ports from the Pi

I found removing ports from the original Pi, including the GPIO header, relatively easy and in one piece. I did all the things you have pointed out, plus diluting the solder with a lead-based one. However, the later Pi versions seem to use a higher melting point solder yet and I have not been able t...
by Steve Drain
Sat May 16, 2015 9:53 am
Forum: C/C++
Topic: Announcing FastARM: in assembly so you don't have to!
Replies: 14
Views: 1747

Re: Announcing FastARM: in assembly so you don't have to!

assembler wrote:In fact, any contribution would be welcome.
I am really out of my depth, but had you considered the Neon instructions on quad vectors? Eg:

Code: Select all

vadd.F32 q0, q0, q1
Just a thought. ;-)
by Steve Drain
Wed May 13, 2015 3:20 pm
Forum: HATs and other add-ons
Topic: Motorola Lapdock Atrix with the Pi
Replies: 16
Views: 3757

Re: Motorola Lapdock Atrix with the Pi

I have often thought of doing something similar, but with the larger Pi2 and a small HDD included. Using the A+ with the Lapdock has a couple of advantages as well as size. It can be back-powered through USB, which reduces the complication of cables, and it uses significantly less current, which is...
by Steve Drain
Wed May 13, 2015 10:25 am
Forum: HATs and other add-ons
Topic: Motorola Lapdock Atrix with the Pi
Replies: 16
Views: 3757

Re: Motorola Lapdock Atrix with the Pi

The two links in the OP are probably a poor guide now. First, the supply of of suitable connectors is much wider and probably cheaper than those earlier times. Second, the features of the current Pi change some of the assumptions. The summary from procount is excellent for the situation now, and I h...
by Steve Drain
Wed May 13, 2015 9:42 am
Forum: RISCOS
Topic: BBC Basic?
Replies: 3
Views: 1569

Re: BBC Basic?

Here are some suggestions. If you have a BASIC program written in StrongED's BASIC mode, you can run it by clicking Select (the left mouse button) on the 'Running man' icon at the top of the window. This will run the program in a single-tasking Command window in the centre of the screen[1], but this...
by Steve Drain
Tue Apr 07, 2015 4:36 pm
Forum: RISCOS
Topic: Filetypes
Replies: 3
Views: 1698

Re: Filetypes

I raised a similar problem on the ROOL forum a while back and I think there is no way to do it that way. You are seeing the Windows files in FatFS on the Pi without any of the translation that VRPC does. Here are two alternatives. The first is easiest, and that is to transfer the files using ShareFS...
by Steve Drain
Tue Mar 31, 2015 9:04 am
Forum: General discussion
Topic: UPS for Pi?
Replies: 52
Views: 36061

Re: UPS for Pi?

Here is one battery pack I know works as you require: http://uk.rs-online.com/web/p/power-banks/7757508/?origin=PSF_451834|alt . Unfortunately it is £32, but I bought mine when they were on offer at half price. Perhaps that will happen again. There is a smaller and cheaper one in the same series whi...
by Steve Drain
Mon Mar 30, 2015 2:09 pm
Forum: Beginners
Topic: Floating Point Conversion from Strings
Replies: 3
Views: 872

Re: Floating Point Conversion from Strings

RISC OS and Assembler is not GNU C. ;-) More helpfully, there is not any SWI that deals with floating point numbers, but here are two options and a warning. First the warning. Double-precision floating point numbers for the Floating Point Emulator (FPE) are in IEEC format, whereas those for VFP have...
by Steve Drain
Thu Mar 19, 2015 6:32 pm
Forum: Other projects
Topic: Pi 2... Is it a bit fragile?
Replies: 10
Views: 2262

Re: Pi 2... Is it a bit fragile?

Not from RISC OS, unfortunately.
by Steve Drain
Thu Mar 19, 2015 5:14 pm
Forum: Other projects
Topic: Pi 2... Is it a bit fragile?
Replies: 10
Views: 2262

Re: Pi 2... Is it a bit fragile?

You are going to use this with RISC OS, so why do you need a PI2? The likelihood of RO using more than one core in the foreseeable future is infinitissimal. Also, if you are removing the Ethernet and USB ports you probably do not want their hub chip, which is a big drain on power. Add in the ridicul...
by Steve Drain
Fri Jan 16, 2015 10:37 am
Forum: Off topic discussion
Topic: AS regards some of the novice questions we're getting....
Replies: 25
Views: 3088

Re: AS regards some of the novice questions we're getting...

I must be old...Before usenet, I remember fidonet and Telefinder BBS networks.
Not that old. 1985: Prestel, Micronet, Home banking, Discussion groups, Email, Software downloads, all via the Viewtex display and on a Spectrum.

I expect the French would have something to say about this, too. :)
by Steve Drain
Tue Dec 09, 2014 10:36 am
Forum: General discussion
Topic: A+ board powered via USB A port
Replies: 3
Views: 810

Re: A+ board powered via USB A port

hashbrow wrote:Now that's what I call a very sweet setup.
http://kappa.me.uk/raspberry_pip4.htm

:-)
by Steve Drain
Sat Nov 15, 2014 12:20 pm
Forum: General discussion
Topic: I made a Raspberry PI Laptop
Replies: 840
Views: 388021

Re: I made a Raspberry PI Laptop

[quote="Lob0426"]Using a back feeding cable is out for the new board. [B+] But not for the A+. This new board is the holy grail as far as I am concerned. My previous minimalised Raspberry Pips have all required a lot of fiddling and some compromise, but I can fit an A+ and all the extras in a cheap ...
by Steve Drain
Tue Nov 11, 2014 5:32 pm
Forum: Beginners
Topic: over-current error while connecting USB dongles
Replies: 10
Views: 2988

Re: over-current error while connecting USB dongles

I think I may have a related problem. A B+ with Noobs set up for Raspbian and RISC OS, but using RISC OS. A 2.1A power supply. I have set_max_current=1 in the RISC OS CONFIG.TXT and I can plug in USB devices after it has booted without problem. However, if I have these devices plugged in when I re-b...
by Steve Drain
Tue Nov 11, 2014 12:16 pm
Forum: Other projects
Topic: Quick Detachable Case
Replies: 8
Views: 2507

Re: Quick Detachable Case

Had you considered self-adhesive magnetic paper? It can be easier to take off than Velcro. If you are lucky, Poundland will have packs in stock, or you can buy more powerful sheets online. Stick one piece to the bottom of your Pi case and another, perhaps larger, one to the back of the TV. The magne...
by Steve Drain
Mon May 19, 2014 9:26 am
Forum: General discussion
Topic: Input please - Using the pi as a tiny little PC for OAP's
Replies: 8
Views: 1686

Re: Input please - Using the pi as a tiny little PC for OAP'

Right. I've got an elderly grandmother who's got a ropey old XP computer from about 2002. [snip] She still uses the old XP machine if she's got to do a letter, or if she basically needs to do some typing. [snip] so the old one can be thrown away. Why are you so keen to thow away the XP machine? How...
by Steve Drain
Fri Feb 07, 2014 5:29 pm
Forum: RISCOS
Topic: BBC Basic compilable?
Replies: 33
Views: 11420

Re: BBC Basic compilable?

RichardRussell wrote:Notoriously the pre-parsing of the formal parameters of PROCs and FNs! I don't do that in BB4W because it doesn't work properly when indirected variables are used as formal parameters, as I'm sure you're aware. ;-)
I am, indeed, and just think about compiling that. :)
by Steve Drain
Fri Feb 07, 2014 12:10 pm
Forum: RISCOS
Topic: BBC Basic compilable?
Replies: 33
Views: 11420

Re: BBC Basic compilable?

In fact the benefit of tokenising is even greater than you suggest, because once the keywords have been converted to single-byte tokens many of the spaces in the program become superfluous as far as the interpreter is concerned. So the program can be made even shorter, and will run faster, by elimi...
by Steve Drain
Fri Feb 07, 2014 11:46 am
Forum: RISCOS
Topic: BBC BASIC sound programming / interfacing with SN76489?
Replies: 7
Views: 6149

Re: BBC BASIC sound programming / interfacing with SN76489?

The version of BBC BASIC for RISC OS on the Pi is ultimately derived from the version on the BBC Micro, so at an elementary level programs can be mutually compatible. However, the sound systems are completely different and despite some superficial likenesses you cannot run programs written for one o...
by Steve Drain
Wed Feb 05, 2014 7:31 pm
Forum: General discussion
Topic: I made a Raspberry PI Laptop
Replies: 840
Views: 388021

Re: I made a Raspberry PI Laptop

Some while back I wrote about my Raspberry Pip, a minimalist approach to linking a Pi and a Lapdock. It took quite bit of work to fit, so I have had another go with a bit more room and more standard components. You can see some pictures of it at http://kappa.me.uk/raspberry_pip3.htm.
by Steve Drain
Tue Feb 04, 2014 5:23 pm
Forum: General discussion
Topic: RPi Atrix Lapdock USB Power Issue
Replies: 2
Views: 1493

Re: RPi Atrix Lapdock USB Power Issue

The usb connection to the Lapdock didn't seem very secure, so I removed the "fit plate" from the cradle and shaved a little off of the cable end. It was still a bit "wiggly," but better. The first time I plugged the RPi in, nothing happened. Jiggling the usb cable got power to the RPi and the NOOBS...
by Steve Drain
Sat Nov 23, 2013 1:35 pm
Forum: Other programming languages
Topic: A Crittical look at ARM BASIC V.
Replies: 81
Views: 21698

Re: A Crittical look at ARM BASIC V.

DavidS wrote:Also thank you for the information on veriable types, I did not know this.
BASIC Reference Manual, under CALL. Available since 1988. Summarised in my StrongHelp manual.
by Steve Drain
Fri Nov 22, 2013 6:43 pm
Forum: Other programming languages
Topic: A Crittical look at ARM BASIC V.
Replies: 81
Views: 21698

Re: A Crittical look at BBC BASIC V.

And yes technicaly PRINT is a keyword and built into the language. No need for 'technicaly'; it is. And it is one of the more awkward parts of the language. It is so versatile that it is a souce of a number of obscure bugs. Thankfully, it is never needed in wimp programs. Types are defined by a cha...
by Steve Drain
Fri Nov 22, 2013 2:27 pm
Forum: Other programming languages
Topic: A Crittical look at ARM BASIC V.
Replies: 81
Views: 21698

Re: A Crittical look at BBC BASIC V.

David I have been using BBC BASIC V since the first Archimedes over a quarter of a century ago. For over 15 years I have been documenting the in-and-outs of the language in a StrongHelp manual: http://kappa.me.uk/basic.htm For more than a decade I have been writing an extension module that seeks to ...
by Steve Drain
Wed Oct 30, 2013 9:01 pm
Forum: RISCOS
Topic: RISC OS Assembly Tutorials.
Replies: 82
Views: 27886

Re: RISC OS Assembly Tutorials.

DavidS wrote:I did not know that the source is available. I can not even find ExtBasAsm anywhere anymore.
You can find both at: http://old-www.moreofthesa.me.uk/progs.source.html.

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