Search found 3211 matches

by jgharston
Tue Oct 16, 2018 5:42 am
Forum: emulators
Topic: Filing system tests and B-Em
Replies: 2
Views: 82

Re: Filing system tests and B-Em

The specification is that OSFILE returns A=file type, and that all calls other than LOAD/SAVE do not error for an absent object, but report that the object is absent. The implementation is that many authors were crap at adhering to the specification. One particular point where this is explicitly req...
by jgharston
Tue Oct 16, 2018 5:39 am
Forum: general
Topic: Were 'podules' ever considered for the BBC Micro?
Replies: 1
Views: 82

Re: Were 'podules' ever considered for the BBC Micro?

That's called "an upgraded BBC Model A".

In fact, what you've described is a bog standard stock BBC B anyway.
by jgharston
Sun Oct 14, 2018 8:26 pm
Forum: software: other
Topic: What will stop ADI2 accessing DFS Track 0?
Replies: 17
Views: 297

Re: What will stop ADI2 accessing DFS Track 0?

the intresse thing is what happens if the disk drive controller can not make sense and it is not a error :) , a disc drive controller trys a lot ( the 8271) before it report an error. then comes the dfs mostly programmed for BBC standaard discs format. and is not that good if something is different...
by jgharston
Sun Oct 14, 2018 8:16 pm
Forum: introduce yourself
Topic: Hello from Northampton (starting an Acorn System 2/3 refurbishment)
Replies: 15
Views: 205

Re: Hello from Northampton (starting an Acorn System 2/3 refurbishment)

thanks for the link, hadn't found that one as yet. Unfortunatly the links to 'Documentation' for all three Systems seem to go to System 2 which I already have as an original paper copy, a System 3 manual would be most helpful. I don't think there was "a" System 3 manual, everything I've tracked dow...
by jgharston
Sun Oct 14, 2018 4:25 pm
Forum: introduce yourself
Topic: Hello from Northampton (starting an Acorn System 2/3 refurbishment)
Replies: 15
Views: 205

Re: Hello from Northampton (starting an Acorn System 2/3 refurbishment)

ChrisO wrote:
Sun Oct 14, 2018 11:17 am
I have a lot of Acorn documentation and firmware but I'm lacking a copy of System 3 DOS if anyone can help ?
http://mdfs.net/Info/Comp/Acorn/Source/MOS.htm
by jgharston
Sun Oct 14, 2018 2:56 pm
Forum: hardware
Topic: Model B serial speeds
Replies: 13
Views: 474

Re: Model B serial speeds

I wonder though & perhaps JGH knows... I used the MOS CFS CRC word at &BE. This is in the filesystem scratch space according to the memory text files I have. Is it safe to trash these two bytes with DFS or ADFS active or do they hold state across filesystem calls so need preserving? Or would I be b...
by jgharston
Fri Oct 12, 2018 3:01 pm
Forum: programming
Topic: Ray Traced Spheres
Replies: 26
Views: 820

Re: Ray Traced Spheres

I've always wondered what program generated this image, and it was probably something similar.
Image
by jgharston
Thu Oct 11, 2018 6:08 pm
Forum: software: other
Topic: How do you say CONT in BBC BASIC?
Replies: 4
Views: 180

Re: How do you say CONT in BBC BASIC?

If you have carefully written your program so that every line is solely a single statement, and every line increments by 10, then then GOTO ERL+10, bearing in mind that all structures (FOR/NEXT, REPEAT/UNTIL, GOSUB/RETURN, PROC/ENDPROC, FN/=) will have been abandoned. If you are finding youself tryi...
by jgharston
Thu Oct 11, 2018 6:04 pm
Forum: software: other
Topic: ADFS Deleted File Recovery - Assistance Required
Replies: 22
Views: 333

Re: ADFS Deleted File Recovery - Assistance Required

...and after 24 hours and 15 minutes my neighbour's lost Win8 file has been mostly recovered.
by jgharston
Thu Oct 11, 2018 2:24 am
Forum: software: other
Topic: ADFS Deleted File Recovery - Assistance Required
Replies: 22
Views: 333

Re: ADFS Deleted File Recovery - Assistance Required

One of the "benefits" of BBC file systems is that in modern terms they are so small. Dave emailed me the "huge" 8M hard drive image and I was able to examine it at home. Before looking I couldn;t remember if ADFS compacted directories after deleting or not, or whether it just nulled out deleted entr...
by jgharston
Thu Oct 11, 2018 2:09 am
Forum: software
Topic: Difficulties extracting zip / adf files to DOM
Replies: 18
Views: 190

Re: Difficulties extracting zip / adf files to DOM

I drag this icon to a directory on my IDE DOM. Wot's an IDE DOM? The I drag the DOM icon to the BeebArc icon in the icon bar. The file linked to in a later message contains a 32-bit ADFS disk image (&800-byte directories, labelled 'Nick', floppies typically 800K or 1600K). BeebArc can only extract ...
by jgharston
Wed Oct 10, 2018 12:00 pm
Forum: software: other
Topic: ADFS Deleted File Recovery - Assistance Required
Replies: 22
Views: 333

Re: ADFS Deleted File Recovery - Assistance Required

daveejhitchins wrote:
Wed Oct 10, 2018 11:43 am
Trying Col's program . . . it's asking for the number of tracks ?? If anyone knows the information for the BeebSCSI 512MB drive - it would be most useful [-o<
Col's RECOVER appears to be a DFS file recovery program.
by jgharston
Tue Oct 09, 2018 9:32 pm
Forum: software: other
Topic: MOS ROM information / guids
Replies: 23
Views: 2023

Re: MOS ROM information / guids

dominicbeesley wrote:
Mon Oct 08, 2018 11:51 pm
JGH - are those os1.20 / 2.00 switches in the zip file on mdfs.net?
Yep. It currently builds UK OS 1.20, German OS 1.20, and gets to about &D000 with US OK 2.00
by jgharston
Tue Oct 09, 2018 9:30 pm
Forum: software: other
Topic: ADFS Deleted File Recovery - Assistance Required
Replies: 22
Views: 333

Re: ADFS Deleted File Recovery - Assistance Required

I deleted a file, accidentally, by mistyping #-o It's on my BeebSCSI, so ADFS. I usually use AFM which makes you 'look' at the files you highlight (and no typing involved) but, in a rush as I'd been repurposed, again, all day :? RECOVER . WARNING: It recovers ***ALL*** files on the disk (though you...
by jgharston
Fri Oct 05, 2018 11:36 am
Forum: hardware
Topic: VDU5 behaves differently on Model B vs. Master
Replies: 30
Views: 619

Re: VDU5 behaves differently on Model B vs. Master

Rich Talbot-Watkins wrote:
Thu Oct 04, 2018 5:24 pm
Was there a BBC OS 1.00? I thought that was the Electron release (which presumably is quite distinct from the BBC OS in many respects).
Yep.
It's suggested it was mask ROM HN613128PB03, but I've only ever had it as an image.
by jgharston
Thu Oct 04, 2018 11:20 pm
Forum: hardware
Topic: 2 (or more) ROMs in the same image
Replies: 9
Views: 333

Re: 2 (or more) ROMs in the same image

Looks like you've made a PC version of SMJoin which takes multiple modules (ROM images with a relocation table) and joins them together to create a single image. I can't say I invented this, I read about it in a BeebBug around about 1987 or so, and later discovered a handful of joined ROM images, of...
by jgharston
Thu Oct 04, 2018 4:10 pm
Forum: hardware
Topic: Return to E2P - the Electron Second Processor
Replies: 9
Views: 340

Re: Return to E2P - the Electron Second Processor

Just for reference, the original article can be found here: https://www.americanradiohistory.com/Archive-Electronics-Today/80s/Electronics-Today-1985-06.pdf#page=32 https://www.americanradiohistory.com/Archive-Electronics-Today/80s/Electronics-Today-1985-07.pdf#page=43 ...and http://mdfs.net/Softwa...
by jgharston
Thu Oct 04, 2018 4:07 pm
Forum: software: other
Topic: MOS ROM information / guids
Replies: 23
Views: 2023

Re: MOS ROM information / guids

The summary of the fixes is: convert all files to NL terminated split FC00 file at FF00 so I can use the real ROM contents in place of JIM/FRED/SHEILA ensured all hex constants are prefixed accordingly replaced a few addresses with computed offsets from addresses removed some duplicate chunks of co...
by jgharston
Thu Oct 04, 2018 4:00 pm
Forum: hardware
Topic: This is not a language
Replies: 38
Views: 757

Re: This is not a language

BASIC is 12 not 13. It's finding there's no language in ROM 13, so counting down from 15 to find a ROM with a language in, finding ROM 15 has a language in, and entering it. Also, Ctrl-SPACE-Break drops you into TAPE/ROM, bypassing any hanging looking for a disk in ADFS. If you can't get to a * prom...
by jgharston
Wed Oct 03, 2018 8:04 pm
Forum: hardware
Topic: VDU5 behaves differently on Model B vs. Master
Replies: 30
Views: 619

Re: VDU5 behaves differently on Model B vs. Master

I remember reading about this somewhere, so it is documented. Probably on paper somewhere.
by jgharston
Wed Oct 03, 2018 8:00 pm
Forum: software: other
Topic: MOS ROM information / guids
Replies: 23
Views: 2023

Re: MOS ROM information / guids

In my patched OS 1.20 I removed the cassette/tape filing system as I didn't need it. It releases about 4K. That is something I never considered, not that I would be able to make it work if code needed moving about. It does provide interesting possibilities to recycle that space for something else t...
by jgharston
Tue Oct 02, 2018 12:07 am
Forum: hardware
Topic: New econet setup
Replies: 75
Views: 1472

Re: New econet setup

As an aside, I was checking SJFiler with some real disks and discovered some old email messages from with my BBC email program from way back in 1985. Naturally, I will have to integrate them into my email archive. :) Intriguingly, the earliest message says "this is the second message"! After some t...
by jgharston
Sun Sep 30, 2018 1:40 am
Forum: hardware
Topic: New econet setup
Replies: 75
Views: 1472

Re: New econet setup

... but I wonder if this might be solved in the case of a Master by using some of the configuration settings to reorganise the Econet workspace? The Master is OK with MMFS and Econet as the workspaces do not overlap. The MMFS uses the Econet workspace in page 3 I believe, so that the two file syste...
by jgharston
Sun Sep 30, 2018 12:07 am
Forum: hardware
Topic: Using a GOTEK with a Master Compact
Replies: 20
Views: 391

Re: Using a GOTEK with a Master Compact

I couldn't get .ADF files working, so I put DFS 2.26 in slot 8 to try .DFS. The ROM shows up on *ROMS, but not on *HELP, same problem with slot 3 and doesn't seem to be working. I have selected it with *CONFIGURE FILE 8, *UNPLUGed ADFS but still no joy. What am I missing? Is it *INSERTed ? I have D...
by jgharston
Tue Sep 25, 2018 8:06 pm
Forum: software & utilities for the pc, mac or unix
Topic: Matrix Brandy BASIC V for Linux with SDL: V1.21.15 released
Replies: 314
Views: 8514

Re: Matrix Brandy BASIC V for Linux with SDL: V1.21.8 released

A bit of experimenting (With VirtualRPC in full-screen mode, so mileage may vary) gives: In 16-colour MODEs, COLOUR r,b,g has the same effect as SYS "ColourTrans_ReturnGCOL",&BBGGRR00 TO A%:COLOUR A% From observation the action performed is to find the palette entry that is closest to R/G/B and retu...
by jgharston
Tue Sep 25, 2018 3:44 pm
Forum: hardware
Topic: Question About Graphics Modes
Replies: 36
Views: 747

Re: Question About Graphics Modes

Good point. Half-intensity or RGB values in a lookup table would have been great. Flashing colours were pants. They might have been useful for palette-switching animation but it could still have had that if they were new colours instead of flashing old colours. How much extra cost could it have add...
by jgharston
Tue Sep 25, 2018 3:36 pm
Forum: software & utilities for the pc, mac or unix
Topic: Matrix Brandy BASIC V for Linux with SDL: V1.21.15 released
Replies: 314
Views: 8514

Re: Matrix Brandy BASIC V for Linux with SDL: V1.21.8 released

That does seem rather limiting. GCOL r,g,b doesn't allow you to do anything that you can't do another way (see below). As previously discussed, in my BASICs a 'colour lookup table' is always used: if the display is hardware paletted then the lookup table is the physical palette (and 'palette animat...
by jgharston
Sat Sep 22, 2018 1:32 pm
Forum: hardware
Topic: New econet setup
Replies: 75
Views: 1472

Re: New econet setup

Hmm. Copying the library files to the econet partition was not as straight forward as I had hoped. It appears the you need to run a program from the ADFS setup disc to copy its contents to the econet when the server is running. You could Zip up the library, copy it to a DFS disk along with an UnZip...
by jgharston
Sat Sep 22, 2018 1:26 pm
Forum: hardware
Topic: I got a Freebeeb! Help needed…
Replies: 21
Views: 530

Re: I got a Freebeeb! Help needed…

There are a ton of ROMs in the computer - many unlabelled. It's been a log time since I last used MOS - how can I get the computer to give me a list of the ROMs when I eventually turn it on? *HELP will ask each ROM to identify itself. If one of the ROMs has a *ROMS command, then *ROMS will list the...
by jgharston
Fri Sep 21, 2018 10:49 pm
Forum: hardware
Topic: What are people happy soldering ?
Replies: 40
Views: 777

Re: What are people happy soldering ?

What's all this millimetre nonsense? Standard 0.1 inch stripboard. :)