Search found 361 matches

by geraldholdsworth
Fri Jun 01, 2018 10:43 am
Forum: hardware
Topic: I was given an Electron, but is it dead?
Replies: 9
Views: 309

Re: I was given an Electron, but is it dead?

Pete Fighter II wrote:
Thu May 31, 2018 8:59 pm
I have the system in a bin bag, but before throwing it out I thought I'd see if this was an easy fix.
Never throw out an old computer, no matter how bad a state it is in. Something like that is always valuable to someone.
by geraldholdsworth
Thu May 31, 2018 5:56 pm
Forum: general
Topic: How far gone must a BBC be to be unfixable?
Replies: 22
Views: 718

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

danielj wrote:
Thu May 31, 2018 5:13 pm
The limit has to be when the parts to fix it cost more than a new machine?
Surely that is still fixable...just uneconomical to fix?
by geraldholdsworth
Sat May 26, 2018 9:30 am
Forum: stardot.org.uk
Topic: Image sizes
Replies: 59
Views: 712

Re: Image sizes

danielj wrote:
Sat May 26, 2018 9:22 am
The question is whether images need to be any bigger for the purposes of the forum
No, 1024x1024 is perfectly adequate for most of the images on this forum.
by geraldholdsworth
Wed May 23, 2018 4:14 pm
Forum: programming
Topic: ADFS Format
Replies: 28
Views: 2117

Re: ADFS Format

I've randomly seen this error when cataloguing old format discs (eg Zarch and Conqueror) but I've not managed to track down the root cause as I've never been able to reliably reproduce the error. Silly me - I was swapping single characters of filenames around to change the order which worked OK on ...
by geraldholdsworth
Wed May 23, 2018 9:12 am
Forum: programming
Topic: ADFS Format
Replies: 28
Views: 2117

Re: ADFS Format

It's been pointed out to me about the ordering of files on ADFS. There is nothing in the PRMs, that I can see, that suggests that the files stored on disc need to be in alphanumeric order. On investigating (using TextEdit on my Mac to change filenames around), I have found: * BBC Master ADFS doesn't...
by geraldholdsworth
Tue May 22, 2018 12:26 pm
Forum: hardware
Topic: New Cartridge Case - for the Electron and Master
Replies: 5
Views: 298

Re: New Cartridge Case - for the Electron and Master

Looks good. One niggle I have with the official BBC Master ROM cartridges (that allow you to plug EPROMs into) is that, when you have EPROMs plugged in, the whole thing is then slightly too fat to fit into the Master cartridge slot. I have, however, got another (not sure who made it) that is taller ...
by geraldholdsworth
Fri May 18, 2018 11:15 am
Forum: hardware
Topic: Cartridge slots
Replies: 8
Views: 425

Re: Cartridge slots

Going back to the Electron - I've often wondered why use the Plus 1 cartridge slots, and not the expansion bus on the back of the main machine?
by geraldholdsworth
Fri May 18, 2018 8:08 am
Forum: emulators
Topic: Mac Arculator
Replies: 31
Views: 1723

Re: Mac Arculator

How did this go? Haven't got far. I was hoping to make Arculator like RPCemu, but it looks like the whole thing needs to be overhauled, as Allegro 4 won't compile. For me, this has ended up as a project (one of many) for a another day. Work and life are getting in the way! :lol: That link is to the...
by geraldholdsworth
Fri May 04, 2018 12:18 pm
Forum: hardware
Topic: RiscPC Second CPU slot ARM possible?
Replies: 8
Views: 649

Re: RiscPC Second CPU slot ARM possible?

I find it odd that Acorn never designed it so you could add a second ARM processor in that slot in the first place. After all, you could get a co-pro for the BBC, so why not the RiscPC?
by geraldholdsworth
Thu May 03, 2018 4:06 pm
Forum: hardware
Topic: Kinetic Flash ROM
Replies: 3
Views: 278

Re: Kinetic Flash ROM

Thank you...was just curious about my card. I've not got much intention of upgrading to RO5 on my RPC, not now I've got a RPi. Although, I have softloaded RO5 onto my Kinetic RPC before now...in fact, I have a CF card reader in place of the hard drive so I can swap between RO4.39 and RO5 easily (wel...
by geraldholdsworth
Wed May 02, 2018 8:12 pm
Forum: hardware
Topic: Kinetic Flash ROM
Replies: 3
Views: 278

Kinetic Flash ROM

I've always meant to ask this - on the ROOL website, on the downloads for RiscPC, there has always been a download which includes a flash programmer for the Kinetic card. I have such a card, but how do I know if it has a flash ROM onboard? And, presumably, by flashing said ROM (if it has one) with 5...
by geraldholdsworth
Sun Apr 29, 2018 12:07 pm
Forum: off-topic
Topic: Windows 10....
Replies: 158
Views: 12284

Re: Windows 10....

I found, the other day, a service running on my Windows 10 install that was using a load of resources. It is called "Superfetch", and apparently is supposed to optimise your machine by caching the most frequently used applications (or some crap like that). Anyway, I stopped it, and changed the start...
by geraldholdsworth
Sun Apr 29, 2018 8:59 am
Forum: off-topic
Topic: LOLPRICE
Replies: 2788
Views: 220355

Re: LOLPRICE

Coeus wrote:
Elminster wrote:Definitely need the time machine.
As long as it isn't via a crowdfunding service. :lol:
Nah - just use the money that has been saved up for a number of years to build it, then go back in time and start the savings account to pay for building it.
by geraldholdsworth
Sun Apr 29, 2018 8:48 am
Forum: hardware
Topic: A9 Home and new to RISC OS
Replies: 25
Views: 924

Re: A9 Home and new to RISC OS

Is there some instructions on how to add a USB device somewhere please? I can't find the documentation I used, and I can't remember off the top of my head how to do it (haven't touched my RiscPC in a few years - it got superseded by a Raspberry Pi!!!). I thought the Simtec website covered it, but h...
by geraldholdsworth
Tue Apr 24, 2018 9:57 am
Forum: hardware
Topic: A9 Home and new to RISC OS
Replies: 25
Views: 924

Re: A9 Home and new to RISC OS

I would try (and this is just guessing) dragging the red bar (System heap/Stack), currently at 124K, to something bigger.
If you SHIFT-double click on !MassFS it will open the directory and their may be a !Help file held within (or middle button over it and see if there is a help option).
by geraldholdsworth
Tue Apr 24, 2018 9:04 am
Forum: hardware
Topic: A9 Home and new to RISC OS
Replies: 25
Views: 924

Re: A9 Home and new to RISC OS

Done a quick bit of research. The A9home is supplied by CJEMicros (http://www.cjemicros.co.uk/micros/products/a9home.shtml) - Chris Evans is pretty good with support and sometimes posts on these forums. The software for the USB uses the Simtec USB stack (http://www.simtec.co.uk/products/SWUSB) - Sim...
by geraldholdsworth
Tue Apr 24, 2018 8:59 am
Forum: hardware
Topic: A9 Home and new to RISC OS
Replies: 25
Views: 924

Re: A9 Home and new to RISC OS

Can't help RE the USB side. On my RiscPC, I need to manually add each USB device to a list for it to see it. On my Raspberry Pi, it sees it automatically. I've never seen, or used, an A9 Home so have no clue. Hopefully someone will come along who knows more, or you can contact the supplier direct fo...
by geraldholdsworth
Mon Apr 23, 2018 7:34 pm
Forum: hardware
Topic: A9 Home and new to RISC OS
Replies: 25
Views: 924

Re: A9 Home and new to RISC OS

Bat wrote:It looks like I have no apps installed. Where can I download them and how do I get them onto the machine :?:
RiscOS Open website would be a good start: https://www.riscosopen.org
by geraldholdsworth
Mon Apr 23, 2018 7:30 pm
Forum: off-topic
Topic: LOLPRICE
Replies: 2788
Views: 220355

Re: LOLPRICE

flaxcottage wrote:The disc could do with archiving but at 1% of the price.
The seller appears to be, or used to be, a denizen of these forums. Maybe if he sees this post, he might oblige and archive it before selling it.
by geraldholdsworth
Thu Apr 19, 2018 8:24 am
Forum: software & utilities for the pc, mac or unix
Topic: New Disk Image Editor
Replies: 76
Views: 2991

Re: New Disk Image Editor

My purpose when I wrote the program was primarily moving files from one format to another. (Host to an image, a DFS disk to a DOS one, etc) When doing this, keeping the original disk minimally changed is not relevant. A programmer writes programs to do something that the programmer wants to do. If ...
by geraldholdsworth
Wed Apr 18, 2018 7:39 pm
Forum: software & utilities for the pc, mac or unix
Topic: New Disk Image Editor
Replies: 76
Views: 2991

Re: New Disk Image Editor

(When an image is read, it is converted into a list of files (or a tree of files and subdirectories). These are all combined back together on save. It would take a major re-write to keep track of where everything was originally.) When I read in a disc, I read the entire image into memory - some mig...
by geraldholdsworth
Sun Apr 08, 2018 9:40 am
Forum: off-topic
Topic: LOLPRICE
Replies: 2788
Views: 220355

Re: LOLPRICE

£250 rare? https://m.ebay.co.uk/itm/The-BBC-Micro-Advanced-Reference-Guide-by-Bruce-Smith/232726141211?_trksid=p2504926.m5232.l9681 Should take a gander at his other items - prices are all over the place. Although 80 quid, on a buy it now, for a BBC B with 1770 DFS upgrade and a couple of manuals, ...
by geraldholdsworth
Sun Apr 08, 2018 9:32 am
Forum: software & utilities for the pc, mac or unix
Topic: New Disk Image Editor
Replies: 76
Views: 2991

Re: New Disk Image Editor

I'm particularly interested in finding a way to get my A5000 files off a CF image file. Have you tried my Image Reader (linked to in this thread, above) - it can read New Map ADFS, which I'm assuming is the format your CF image file is in. My code is somewhat behind David's in that it can only read...
by geraldholdsworth
Tue Apr 03, 2018 1:14 pm
Forum: software & utilities for the pc, mac or unix
Topic: New Disk Image Editor
Replies: 76
Views: 2991

Re: New Disk Image Editor

I will need to know in detail what the format of such images is. I know this is available in threads on this forum, or web pages maintained by forum members, but I will need to find the information and study it - some people have recently suggested that it is not the simplest format to interpret. T...
by geraldholdsworth
Tue Apr 03, 2018 1:11 pm
Forum: software & utilities for the pc, mac or unix
Topic: New Disk Image Editor
Replies: 76
Views: 2991

Re: New Disk Image Editor

This may be a disk size issue. I ignore the disc size values, as I want to handle hard discs also. Only time I take any notice is to ensure it is >0bytes (if the first 512 bytes are all zeros, the checksums will pass - this means that a Commodore 64 disc image can get mis-IDed as an ADFS). I found ...
by geraldholdsworth
Sun Apr 01, 2018 12:11 pm
Forum: software & utilities for the pc, mac or unix
Topic: New Disk Image Editor
Replies: 76
Views: 2991

Re: New Disk Image Editor

If it's the files from BeebEm, mine won't open them either. Annoyingly, it did - but I made a change which somehow affected it. From my perspective, the header checksums (at 0x0FF and 0x1FF) don't match what is calculated (either one or the other is off by 1). The same is true for the *.adl files su...
by geraldholdsworth
Sun Apr 01, 2018 5:41 am
Forum: software: classic games
Topic: Superior Software 1987
Replies: 5
Views: 611

Re: Superior Software 1987

when the player didn't do anything for a while, instead of Repton doing a looking left/right animation, he'd "knock" on the computer screen as if to wake the player up, and there would be a knocking noise. In the end they said they had difficulty getting the idea to work (animation/graphic problem,...
by geraldholdsworth
Fri Mar 30, 2018 6:49 pm
Forum: software & utilities for the pc, mac or unix
Topic: New Disk Image Editor
Replies: 76
Views: 2991

Re: New Disk Image Editor

I mentioned in a recent thread that I have been working on a ( Windows ) program to handle BBC disk images. It is now at a stage where others might like to try it out. Wow - what's that now? Three different utilities for Windows all being developed simultaneously. I suppose at least this one can wr...
by geraldholdsworth
Mon Mar 26, 2018 11:24 am
Forum: programming
Topic: ADFS Format
Replies: 28
Views: 2117

Re: ADFS Format

Just a quick note to say that I've uploaded the latest version of this document, which now includes details on the AmigaDOS format (that other *.adf and *.hdf file extension format), plus a few other minor adjustments (and some more details included in this thread about physical disc formats, just f...
by geraldholdsworth
Sun Mar 25, 2018 4:04 pm
Forum: software: other
Topic: Forbidden characters in filenames
Replies: 6
Views: 429

Re: Forbidden characters in filenames

The next obvious point is to ask: why do you want to know? What is it you want to do that requires you to second-guess the filing system? It's for my Disc Image Reader project - I'm thinking about writing the code to save back to the image. I know that top bit set characters on DFS can be dodgy (as...