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Whether that's bundled in the same executable as the Basic interpreter is irrelevant, it's not part of BASIC, it's part of the filing system layer. I can't speak for Matrix Brandy, but in BBCSDL there are indeed two distinct 'layers', which run in different threads and communicate with each other v...

I've just discovered a bug with EOF#. EOF#0 returns 0, instead of causing an "invalid channel" error as it does in other versions of BBC BASIC. That's not a function of BASIC, that's a function of the filing system Whilst that would be true if Brandy was running on RISC OS, it's not when the filing...

you could use any editor on the PC to edit basic programs. Not 'tokenised' (internal format) BASIC programs, which is what programs in an SSD are likely to be. "Any editor on the PC" is only going to be useful for plain text files, such as might be created by *SPOOL and/or loaded with *EXEC, but th...

EVERY bit of music coding I've written since about 1983 has been based on 101=middle C. On which channel? As I understand it, Acorn have deliberately made the different 'tone' channels (1, 2, 3) generate slightly different frequencies so that if you play the same note on two or three channels toget...

The problem you're encountering is that SLIDE uses Richard Russel's newer tokenized format instead of Acorns. As I've mentioned, since SDLIDE is itself written in BBC BASIC adapting it to output Acorn-format tokenised programs would not be difficult (the latest version already loads Acorn format fi...

would be looking to double the performance... and the Z80 didn't have the headroom for that, I think. Assuming an approximately 2:1 difference between clock rates for equivalent performance (i.e. a 4 MHz Z80 roughly equivalent to a 2 MHz 6502) the relevant dates, according to the internet , are: Z8...

The only issue I'd have with that is the fact that upon startup it erm demands a data disc or such rather than drop straight into Basic My recollection is quite vague after all these years, but I suspect we (i.e. the BBC) had an RFS ROM containing Z80 BBC BASIC which could be run without a disk (it...

trixster wrote: ↑

Sat Feb 09, 2019 1:18 pm

I can only assume something has change wrt glasstty.com

It seems to be fine when accessed from my telstar.bbc program (supplied with BBC BASIC for SDL 2.0).

Here's a BASIC program to do the job. I have uploaded a Windows executable here , it has not been extensively tested but seems to work. REM!Exefile tokenise.exe,signed,encrypt,console ON ERROR PRINT REPORT$ : QUIT REM Standard console program rubric: SYS "GetStdHandle", -10 TO @hfile%(1) SYS "GetStd...

Is there an easy way to tokenize plain text BASIC files? You can call the built-in tokeniser (in all versions of BBC BASIC except Brandy) using a cheat involving EVAL . Jonathan has a BASIC library which incorporates this code and will run on 6502, Z80, 32000, RISC OS, MS-DOS or Windows BBC BASIC. ...

After three years of (intermittent) development I have been persuaded to bump the BBCSDL version number to 1.00a, which I have duly released. See the full announcement here.

dominicbeesley wrote: ↑

Thu Jan 31, 2019 11:30 am

When I get time I'll have a go at changing SDLIDE to save as Acorn format too.

Version 1.00a of SDLIDE, released today, supports loading (but not saving) of Acorn-format programs.

Soruk wrote: ↑

Fri Feb 01, 2019 11:26 am

I don't have any Bezier curve capability in the SDL code yet, but SDL_gfx for SDL1.2 might.

It does (SDL_gfx and SDL2_gfx are almost identical functionally I think).

this will not work in Brandy. Its internal structures are not visible to a running BASIC program, indeed PAGE = 0 on Linux and Windows builds. So what memory is visible to a running BASIC program? Presumably everything between LOMEM and HIMEM is, otherwise indirection would not work. What about abo...

Incidentally, RTR - how/why did the different BASIC formats come about? There were two main factors. Firstly, the CPU families for which I've written BBC BASIC interpreters (Z80, 8086, IA-32) are all little-endian, that is they expect 16-bit values stored in memory to have the least-significant 8-b...

Trouble is I'm struggling to understand the maths to make it not leave gaps or draw jagged edges.... I don't support non-axis-aligned ellipses natively in BB4W or BBCSDL, because the graphics libraries they rely on ( Windows GDI in the case of BB4W, SDL2_gfx in the case of BBCSDL) don't support the...

Anyway, just a thought. You may have other requirements that I haven't fully appreciated. I don't have any "requirements" since I'm not the OP! I'm personally not interested in running programs on a Beeb (or an emulator) or in 'retro-computing' of any sort. I get my kicks from pushing BBC BASIC to ...

I suppose I was thinking more of the delay while the user waits for the program encoded in the UEF to load into the emulated Beeb's memory from the emulated cassette recorder. So is the default to load at the same speed as a real Beeb would load from a tape? If so (and I might argue that's taking e...

Just to clarify: you’re looking for BASIC code that would construct a blank .SSD in memory; add a file to the .SSD — the content of the file being a tokenised BASIC program which the user has been editing and wants to test in BeebEm (or another emulator); and then write the .SSD to a file on the ho...

RTR, as Tricky says you can use BeebAsm to make an SSD BeebAsm sounds like an assembler so I didn't think that comment was directed at me. What I'm really looking for is BASIC code that I can incorporate in a patched version of SDLIDE, not (ideally) an external utility that it would have to call - ...

Will I have to make a .ssd or .uef file, and if so which is the simpler of the two to build? Nobody? Being able to run the program on a Beeb emulator at the click of a button - no need to save from the editor and then load into the Beeb, or copy to the clipboard and then *EXEC - seemed pretty cool ...

That's why I suggested SDLIDE, because you can adapt it to do anything you want. To run the program on an emulator you wouldn't even need to save it first, you could arrange for that to happen simply by clicking the Run button! I've been experimenting with doing that using BeebEm, but it's seemingl...

does TAB do anything special in the editor TAB currently does nothing in the SDLIDE editor. CTRL+I, which generates the same keycode, is a shortcut for 'Insert file', but the TAB key is explictly ignored by testing INKEY(-97): WHEN 314,9: IF NOT INKEY(-97) THEN PROCundosave(Buffer$(), UndoLevel%, R...

it doesn't seem to expand abbreviated keywords like BBC Basic for windows or am I missing an option somewhere - I naturally abbreviate BASIC. Keyword abbreviations too often clash with the structure-member syntax in BB4W/BBCSDL so I always disable them anyway. But the only reason they don't work in...

tom_seddon wrote: ↑

Thu Jan 24, 2019 12:54 am

JSBeeb's tokenizer does something interesting: it runs the tokenizer from the BASIC 4 ROM!

All versions of BBC BASIC (with the possible exception of Brandy, I need to check that) allow you to run their built-in tokeniser via a cheat involving EVAL.

I really want something "seamless" - what I'd like to do is be able to hit save in my PC editor, saving to my HostFS share and then instantly run on the real beeb. That's why I suggested SDLIDE, because you can adapt it to do anything you want. To run the program on an emulator you wouldn't even ne...

Are there any programs that will directly edit BBC Basic programs on a PC? The closest I've found is BBC Basic for Windows but that doesn't seem to save out in "old style" tokenized basic and requires an extra step to export as text then *exec it on the beeb which is a bit of a pain. You could modi...

Not as momentous as the original spec you posted but all part of the history. Although I don't think I have my own copy, I strongly suspect I wrote it! I've spotted one mistake: it implies that semicolon acts in INPUT as it does in PRINT, but although that was true of some contemporary BASICs it ne...

scruss wrote: ↑

Mon Jan 21, 2019 9:05 pm

Seems mostly to be a BBC BASIC language spec plus some physical/electronic details.

I note that the keyboard layout (last page) appears to have been produced by Chris Turner (CBT) and somebody with the initials RR. I wonder who that might be!

The assumption I have come to is that because the logic is running at low speeds i.e. sub 10Mhz the above points are as critical ? When something is described as 'best practice' (and I agree with all the recommendations you listed) it doesn't mean that ignoring the advice will definitely cause the ...