Search found 833 matches

by crj
Sun Apr 08, 2018 1:25 am
Forum: programming
Topic: Acorn files on other platforms
Replies: 38
Views: 1906

Re: Acorn files on other platforms

For what it's worth, I'm currently pursuing the idea of emulated 6502 code in a restricted environment as a way to implement filing systems. In the process, I'm trying to formulate a clean C++ emulator implementation based loosely on the one in PiTubeDirect, but taking advantage of generic coding te...
by crj
Sat Apr 07, 2018 3:28 pm
Forum: hardware
Topic: Reverse Tube - an amusing idea
Replies: 8
Views: 638

Reverse Tube - an amusing idea

A random idea that occurred to me... Tube ULA: 8 bytes of memory-mapped I/O Tube space in SHEILA on the Beeb: 32 bytes The logic required to connect a Tube ULA's host side to one Beeb normally, and the parasite side to &FEF0-7 on a second Beeb would be small and simple. (For added style, you'd inclu...
by crj
Thu Apr 05, 2018 8:54 pm
Forum: hardware
Topic: Running a beeb with no keyboard plugged in
Replies: 31
Views: 1011

Re: Running a beed with no keyboard plugged in

I've heard rumours that you can run without a keyboard if you unplug the System VIA (IC 3) though I've never tried it myself. As for the ROM problem: IC88 and IC101 are working; IC52 and IC100 are not? That means ROMs xx01 and xx11 are working, xx00 and xx10 are not. Assuming there is one root cause...
by crj
Thu Apr 05, 2018 8:28 pm
Forum: hardware
Topic: Palettemate / enhanced video ULA with 4096 colours
Replies: 583
Views: 49015

Re: Palettemate / enhanced video ULA with 4096 colours

That's a cheap clone which might or might not work. Fortunately, it's reasonably easy to get both USB and Blaster interfaces correct at the electrical level so it probably won't blow anything up!

The Terasic clones for about £40 seem to be the cheapest that people actually trust.
by crj
Thu Apr 05, 2018 8:23 pm
Forum: hardware
Topic: Soldering and Hotair station options
Replies: 38
Views: 1858

Re: Soldering and Hotair station options

Hey, at least that's down from the half a grand people had to pay for a Metcal iron a decade ago!
by crj
Thu Apr 05, 2018 1:15 am
Forum: programming
Topic: Acorn files on other platforms
Replies: 38
Views: 1906

Re: Acorn files on other platforms

A wild idea that's occurred to me: At first glance neither ADFS nor 1770 DFS need very much of the OS. If you emulated: 6502 CPU RAM at &0000-&02FF, &0D00-&1FFF The filing system ROM at &8000-&BFFF (no need for paging!) OS entry points at &FF00-&FFFF Floppy hardware in page &FE80-&FE87 Hard disc har...
by crj
Thu Apr 05, 2018 12:34 am
Forum: programming
Topic: Acorn files on other platforms
Replies: 38
Views: 1906

Re: Acorn files on other platforms

Ooh! Stylistically at least, if not in terms of completeness of implementation, that's much more like it. (-8
by crj
Wed Apr 04, 2018 10:13 pm
Forum: programming
Topic: Acorn files on other platforms
Replies: 38
Views: 1906

Re: Acorn files on other platforms

None of this seems awfully hard to fix; you're right that Perl isn't the easiest language to work with, but adding these features to the existing, working code is still going to be much easier than rewriting the whole thing I'm not so sure of that. It's a 1,000-line Perl monolith which combines com...
by crj
Wed Apr 04, 2018 6:05 pm
Forum: programming
Topic: Acorn files on other platforms
Replies: 38
Views: 1906

Re: Acorn files on other platforms

Are you aware of Stephen's mmb_utils? [...] They are written in perl, but run happily on Windows. I use these for the packaging phase in all of my projects. I don't know about Kieran, but I've glanced at them. While they may solve the specific, narrow problem of shoehorning some specific files into...
by crj
Wed Apr 04, 2018 2:14 am
Forum: off-topic
Topic: Bank Holiday
Replies: 25
Views: 1026

Re: Bank Holiday

I sent Mrs H out yesterday to grab some reduced chocolate eggs Mmmmm! I hope she found some! In recent years, supermarkets seem to have elected to have the Easter eggs vanish from shelves instead of sitting around discounted after Easter, presumably to encourage people to buy full-price eggs before...
by crj
Wed Apr 04, 2018 12:00 am
Forum: programming
Topic: Acorn files on other platforms
Replies: 38
Views: 1906

Re: Acorn files on other platforms

I hate that the name in the inf can override the filename on the host machine My instinct is that it's fine that it can override the host filename. Given the alternative is being sure that you have a reversible mapping between host filename and Acorn filename - a pretty tall order given how many di...
by crj
Tue Apr 03, 2018 4:39 pm
Forum: programming
Topic: Acorn files on other platforms
Replies: 38
Views: 1906

Re: Acorn files on other platforms

Have you never opened a ZIP file on RISC OS? No, never! Back in the day I used NFS to my RISCiX server, and now my heart is in 8-bit retrocomputing. The reason I'm putting thought into RISC OS as well is that I recognise any solution has to work for both to enjoy widespread acceptance. Never notice...
by crj
Tue Apr 03, 2018 12:49 am
Forum: off-topic
Topic: My Wife
Replies: 39
Views: 1724

Re: My Wife

)-8
by crj
Tue Apr 03, 2018 12:47 am
Forum: hardware
Topic: Arduino Filestore - Code now available to download
Replies: 9
Views: 748

Re: Arduino Filestore - Code now available to download

I thought the RISC OS NetFS hacked the choice of library itself?
by crj
Tue Apr 03, 2018 12:42 am
Forum: hardware
Topic: Printing from the BBC Model B
Replies: 15
Views: 722

Re: Printing from the BBC Model B

No, you'd want a forwards serial to USB adapter. Serial... to..... USB. So the stuff goes from the serial port, goes through and adapter, and goes to a USB port. Stuff starts at the serial end, and as time advaces in the direction that time advances, it becomes USB stuff. A backwards serial to USB ...
by crj
Tue Apr 03, 2018 12:39 am
Forum: programming
Topic: Acorn files on other platforms
Replies: 38
Views: 1906

Re: Acorn files on other platforms

Hmm. What tools support a 256Kbyte DFS image, though? It won't fit on a disc; can you make a .ssd file that big and have it work? The extension to ZIP is good to know about; I assumed ZIP files just tended to contain a .INF file alongside the actual file. For completeness, it looks like ZIP comes in...
by crj
Mon Apr 02, 2018 2:20 am
Forum: software: classic games
Topic: (OT?) What's that simple game with converging enemies?
Replies: 6
Views: 605

Re: (OT?) What's that simple game with converging enemies?

You say real-time, so this isn't it, but robots sounds like the turn-based version. It's been available since forever as one of the games on BSD unix systems.
by crj
Mon Apr 02, 2018 1:09 am
Forum: projects
Topic: Making reasonable progress with a Sudoku solver
Replies: 75
Views: 3504

Re: Making reasonable progress with a Sudoku solver

Note the code can go at &800 on a second processor; most of the OS is missing. (-8

(Actually, if you're running pure machine code without using BASIC or similar, you can start at &400 and use contiguous RAM all the way up to &F800!)
by crj
Mon Apr 02, 2018 1:05 am
Forum: hardware
Topic: RGB keyboard LEDs?
Replies: 26
Views: 1255

Re: RGB keyboard LEDs?

Excellent! (-8 Limor "Lady Ada" Fried has spoken a few times about the maker culture of today feeling very like the home computer revolution of the late seventies and early eighties. The kids who'd have been hacking in BASIC 40 years ago are now messing about with 3D printers and a pile of electroni...
by crj
Mon Apr 02, 2018 12:55 am
Forum: hardware
Topic: Printing from the BBC Model B
Replies: 15
Views: 722

Re: Printing from the BBC Model B

The BBC Micro can print via serial as well as parallel. That's almost certainly a better bet for bodging through to a modern printer. And I may be out of touch, but a few years ago, printers used to auto-detect between Postscript, PCL and plain text depending on the preamble of whatever you sent the...
by crj
Mon Apr 02, 2018 12:41 am
Forum: programming
Topic: Acorn files on other platforms
Replies: 38
Views: 1906

Re: Acorn files on other platforms

BigEd has a good point here. What problem are you trying to solve? While .ssd and mmb files have limitations, the great advantage is that they can be read by a real bbc micro. Yes, although not a real RISC OS box... I mean, a .ssd file is great as a way of distributing a video game. But am I unusua...
by crj
Mon Apr 02, 2018 12:15 am
Forum: programming
Topic: Acorn files on other platforms
Replies: 38
Views: 1906

Re: Acorn files on other platforms

I don't think binary is a good idea for an archival format. Dare I say it, Microsoft's "new" office format has some very good ideas: it's a zip archive, and (at least) one of the files inside is in XML. Hmm. That seems self-contradictory. ZIP is every bit as much a binary file format as sqlite! It ...
by crj
Sun Apr 01, 2018 11:05 pm
Forum: hardware
Topic: Add a second floppy to Archs without support (i.e. extra Gotek)
Replies: 34
Views: 2257

Re: Add a second floppy to Archs without support (i.e. extra Gotek)

Another option (using exactly the same PCB) would be to use a stacking header to make a dongle. If the second drive select is n/c then presumably you could then plug the dongle into the mainboard, or either floppy drive, wherever there was most room.
by crj
Sun Apr 01, 2018 10:56 pm
Forum: hardware
Topic: Sideways RAM on the BBC Micro
Replies: 44
Views: 2148

Re: Sideways RAM on the BBC Micro

Mmm. Until now, SRAM and EEPROM/Flash have been the main options for such modules, but F-RAM chips are getting larger and cheaper, so I suspect in a few years' time they'll be the natural choice. The only question is who'll be the first to make the leap.
by crj
Sun Apr 01, 2018 10:16 pm
Forum: hardware
Topic: Sideways RAM on the BBC Micro
Replies: 44
Views: 2148

Re: Sideways RAM on the BBC Micro

Never considered it. The chip you've linked is 64kbit so 8kx8. The largest parallel FRAM mouser sell is 32kx8 @ £10.60+VAT... so you'd need 2 to get 4x16KB banks. I don't think anyone would buy that it is just too expensive. OK, I'm an idiot, was in a hurry, and dug out the wrong part. )-8 There ar...
by crj
Sun Apr 01, 2018 3:54 pm
Forum: hardware
Topic: Sideways RAM on the BBC Micro
Replies: 44
Views: 2148

Re: Sideways RAM on the BBC Micro

I'm the BooBip guy. Please feel free to ask me any questions. OK. Since this thread is talking about EEPROM v. RAM... have you considered making a variant of your boards with a 64K F-RAM on it? I mean, such a board would cost a tenner more than your other offerings, but has all the advantages of bo...
by crj
Sun Apr 01, 2018 3:58 am
Forum: hardware
Topic: Glitchy Master
Replies: 26
Views: 602

Re: Glitchy Master

...I'm being dense. Don't bother with that hack. Just P.~!&FD after the glitch happened to see where the BRK was.
by crj
Sun Apr 01, 2018 3:39 am
Forum: hardware
Topic: Glitchy Master
Replies: 26
Views: 602

Re: Glitchy Master

Dumb question: what's an ABR? That kind of ">" blank-line ">" tends to be symptomatic of the machine suddenly finding itself executing three zero bytes where code ought to have been. That points to a problem reading ROM or RAM. (Is it my imagination, or does the Master lack the model B's weak pull-u...
by crj
Sun Apr 01, 2018 3:11 am
Forum: software: classic games
Topic: Superior Software 1987
Replies: 6
Views: 843

Re: Superior Software 1987

It sounds like you'll love Mad Professor Mariarti. :-p
by crj
Sun Apr 01, 2018 3:00 am
Forum: programming
Topic: Acorn files on other platforms
Replies: 38
Views: 1906

Re: Acorn files on other platforms

Feels like the sort of thing that could be awesome, but also could result in a " there are 15 competing standards " situation :) Indeed. I'm aware of that risk. Hence my reluctance to plough in and do something if there's not a useful amount of buy-in by anyone else. Are you thinking of this as an ...