Search found 351 matches

by dv8
Sun Jan 24, 2021 1:14 pm
Forum: general
Topic: Shift Lock Led
Replies: 8
Views: 272

Re: Shift Lock Led

Becky wrote:
Sun Jan 24, 2021 12:49 pm
I was just thinking it would be good to have a single key press to get a star.
The TAB key can be reprogrammed to give a star with:

*FX219,42

or you could of course use one of the function keys:

*KEY 0 *
by dv8
Thu Jan 21, 2021 7:57 pm
Forum: scanning of books, magazines, ads and letters
Topic: New Advanced User Guide (NAUG) [Remastered PDF]
Replies: 36
Views: 5646

Re: New Advanced User Guide (NAUG) [Remastered PDF]

Another round of corrections. The updated PDF is in the opening post . Changes since revision 4 (April 2020): p102 (110) 6.1 OS calls : NVWRCH &FFCB should be 'Non-vectored write', NVRDCH &FFC8 should be 'Non-vectored read' p129 (137) 8.6 user VIA interrupts : IRQV2 should be IRQ2V p159 (167...
by dv8
Thu Jan 21, 2021 7:51 pm
Forum: scanning of books, magazines, ads and letters
Topic: Advanced User Guide (AUG) [Remastered PDF]
Replies: 27
Views: 5253

Re: Advanced User Guide (AUG) [Remastered PDF]

Another round of corrections. The updated PDF is in the opening post . Changes since revision 4 (November 2019): p21 (23) Ch.3 example listing : line 10 should be OSWRCH=&FFEE p152 (154) OSBYTE &81 read machine type : US OS version should be A1.0 p308 (310) 13.11 light pen listing : line 270...
by dv8
Wed Jan 20, 2021 3:47 pm
Forum: scanning of books, magazines, ads and letters
Topic: Acorn Graphics Extension ROM (GXR) User Guide [Remastered PDF]
Replies: 29
Views: 4956

Re: Acorn Graphics Extension ROM (GXR) User Guide [Remastered PDF]

Thanks for the correction, Toby. I've re-issued the PDF and zip file in the top post . Changes since revision 1, April 2019: p27 (33) 3.1 colour patterns, second example : PLOT &90,740,512 should be PLOT &9D,740,512 p70 (76) Appendix A : OSBYTE A=163, X=242, Y=65 : f=1 FLOOD on, f=0 FLOOD of...
by dv8
Thu Jan 07, 2021 8:07 pm
Forum: 8-bit acorn emulators
Topic: Opening debugger makes BeebEm crawl
Replies: 2
Views: 191

Re: Opening debugger makes BeebEm crawl

Try disabling the menu item Options > Freeze when inactive.
by dv8
Fri Jan 01, 2021 4:04 pm
Forum: 8-bit acorn hardware
Topic: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 290MHz)
Replies: 1325
Views: 183496

Re: Pi-based Co-Pro on the cheap - 100MHz 6502 for £10? (now 290MHz)

BeebMaster wrote:
Fri Jan 01, 2021 3:29 pm
Possibly an issue with the language relocator introduced in MOS 3.50?
That's exactly what it is.
The relocation tables for BASIC and EDIT are at the end of the VIEW ROM.
Have you replaced VIEW using the overlay board?
by dv8
Tue Dec 08, 2020 9:52 pm
Forum: 8-bit acorn software: classic games
Topic: Early Beeb games - 1982
Replies: 18
Views: 1028

Re: Alien Destroyers

lurkio wrote:
Tue Dec 08, 2020 9:13 pm
(Even if you load Mick's original DSD Disc010 into an emulator and manually type CHAIN"ALIEN-L", the game doesn't run! You have to use the DSD menu program! No idea why.)
It seems to work if you do *FX4,1 first before loading ALIEN-L
:?
by dv8
Tue Dec 08, 2020 7:55 pm
Forum: 8-bit acorn hardware
Topic: BBC Master (DualOS) Default ROM Customising
Replies: 24
Views: 635

Re: BBC Master (DualOS) Default ROM Customising

dhoggan wrote:
Tue Dec 08, 2020 6:56 pm
I thought ROM 8 was multiplexed with SW RAM, no? So very much a case of have one at the cost of two banks of the other.
No, that only happens with ROMs 4,5 and 6,7 in the two outer sockets.
The middle socket takes a 16K ROM which maps to bank 8 without losing any SW RAM.
by dv8
Tue Dec 08, 2020 2:39 pm
Forum: 8-bit acorn hardware
Topic: BBC Master (DualOS) Default ROM Customising
Replies: 24
Views: 635

Re: BBC Master (DualOS) Default ROM Customising

View can't be replaced in 3.5 if you ever want to use a co-processor. It contains the relocation tables for BASIC and EDIT. (The memory map above incorrectly places the BASIC relocation table at the end of the ADFS ROM) It is, however, possible to combine a smaller ROM (<14K) with the relocation tab...
by dv8
Tue Dec 08, 2020 10:51 am
Forum: introduce yourself
Topic: Hello! From Sussex
Replies: 10
Views: 423

Re: Hello! From Sussex

I have tried similar when trying to open I modified image of my wife to is would be compatible for the Beeb, but they are never saved at sad or dsd, they appear as btm files on the Beeb! The pictures generated from the image converter are simply raw bitmap data. The Beeb needs to be told what to do...
by dv8
Wed Dec 02, 2020 3:37 pm
Forum: scanning of books, magazines, ads and letters
Topic: BCPL for the BBC Microcomputer [Remastered PDF]
Replies: 15
Views: 1226

Re: BCPL for the BBC Microcomputer [Remastered PDF]

The PDF for the Calculations Package has now been added to the top post . Thanks again to danielj for providing the scans. I've also updated the zip file after realising that the tutorial discs should have been padded to full-size so they can be written to on Goteks/MMFS2 etc. The new zip file also ...
by dv8
Sun Nov 29, 2020 7:38 pm
Forum: scanning of books, magazines, ads and letters
Topic: BCPL for the BBC Microcomputer [Remastered PDF]
Replies: 15
Views: 1226

Re: BCPL for the BBC Microcomputer [Remastered PDF]

danielj wrote:
Sun Nov 29, 2020 6:09 pm
I've just given dv8 a link to the TIFFs for the calc package manual. They do need some bodgery to make them useful!
Got them, thanks.
Hopefully the OCR will be able to read them without too much fettling.
by dv8
Sun Nov 29, 2020 3:04 pm
Forum: scanning of books, magazines, ads and letters
Topic: BCPL for the BBC Microcomputer [Remastered PDF]
Replies: 15
Views: 1226

Re: BCPL for the BBC Microcomputer [Remastered PDF]

Lardo Boffin wrote:
Sun Nov 29, 2020 1:11 pm
Ok if I put these on my git page for BCPL? With appropriate credit of course.
I would prefer a link to this thread, if that's ok?
by dv8
Sun Nov 29, 2020 12:03 pm
Forum: scanning of books, magazines, ads and letters
Topic: BCPL for the BBC Microcomputer [Remastered PDF]
Replies: 15
Views: 1226

BCPL for the BBC Microcomputer [Remastered PDF]

Attached are remastered PDFs of the books BCPL for the BBC Microcomputer , BCPL Stand Alone Generator on the BBC Microcomputer and BCPL Calculations Package on the BBC Microcomputer by Chris Jobson and John Richards. The zip file contains the BCPL ROM and disc images for the main BCPL compiler, the ...
by dv8
Sat Nov 21, 2020 9:34 pm
Forum: scanning of books, magazines, ads and letters
Topic: New Advanced User Guide (NAUG) [Remastered PDF]
Replies: 36
Views: 5646

Re: New Advanced User Guide (NAUG) [Remastered PDF]

6502 wrote:
Sat Nov 21, 2020 8:25 am
Spotted another little boo boo.
Thanks.
It looks like these calls are also wrong in the AUG.
I'll get it fixed in the next release of both books.
by dv8
Sat Oct 31, 2020 3:45 pm
Forum: scanning of books, magazines, ads and letters
Topic: COMAL on the BBC Microcomputer [Remastered PDF]
Replies: 4
Views: 759

Re: COMAL on the BBC Microcomputer [Remastered PDF]

Lardo Boffin wrote:
Sat Oct 31, 2020 12:56 pm
Is BCPL next? [-o<
It is, after a quick detour to finish off the Master Advanced Reference Manual.
by dv8
Sat Oct 31, 2020 12:05 pm
Forum: scanning of books, magazines, ads and letters
Topic: COMAL on the BBC Microcomputer [Remastered PDF]
Replies: 4
Views: 759

COMAL on the BBC Microcomputer [Remastered PDF]

Attached is a remastered PDF of the book COMAL on the BBC Microcomputer and Acorn Electron by Roy Thornton and Paul Christensen. The included SSD disc image contains some of the longer listings and examples from the book, along with a copy of the COMAL ROM. Boot the disc with Shift+Break to get an i...
by dv8
Sat Oct 31, 2020 11:47 am
Forum: scanning of books, magazines, ads and letters
Topic: New Advanced User Guide (NAUG) [Remastered PDF]
Replies: 36
Views: 5646

Re: New Advanced User Guide (NAUG) [Remastered PDF]

TobyLobster wrote:
Tue Oct 13, 2020 11:35 am
The smallest of all possible errors: p129 section 8.6 refers to "IRQV2", but everywhere else this is called "IRQ2V"
Thanks. This will be corrected in the next release.
by dv8
Sat Oct 31, 2020 11:46 am
Forum: scanning of books, magazines, ads and letters
Topic: Advanced BASIC ROM User Guide [Remastered PDF]
Replies: 6
Views: 3443

Re: Advanced BASIC ROM User Guide [Remastered PDF]

Hi. Don't know if you're interested in possible errata, but I think locations &1C and &1D actually hold the "data pointer" rather than "BASIC PROGRAM START ... pointer to start of BASIC program" as the PDF currently says on page 138. I would like these books to be as acc...
by dv8
Sun Sep 13, 2020 4:14 pm
Forum: programming
Topic: Save Routine Modification
Replies: 6
Views: 482

Re: Save Routine Modification

What would I need to change in this code to ensure that the game looks for a disk image in drive 1 instead of drive 0? Basically, a drive specifier needs to be added to the start of the filename. i.e. change the end of line 13710 to read F$=":1."+E$ 13710DEFPROCSG:CLS:PROCB("SAVING G...
by dv8
Wed Sep 09, 2020 12:14 am
Forum: scanning of books, magazines, ads and letters
Topic: BBC Master Reference Manual [Remastered PDFs]
Replies: 7
Views: 911

BBC Master Reference Manual [Remastered PDFs]

Here is a completely remastered PDF of the BBC Master Reference Manual parts 1 and 2. The look and layout of the original books have been preserved. A number of error corrections have been applied to the text. All diagrams have been redrawn in vectors. There is extensive hyperlinking - click on any ...
by dv8
Sun Sep 06, 2020 3:23 pm
Forum: 8-bit acorn hardware
Topic: Why does the pi tube break TurboMMC?
Replies: 5
Views: 321

Re: Why does the pi tube break TurboMMC?

The Pi co-processor needs to be disabled before running games (or the game menu).
To do this, enter the command:

*FX151,230,14

then press Ctrl+Break to reset the Beeb.
by dv8
Fri Sep 04, 2020 7:51 pm
Forum: programming
Topic: Programming a delay in assembly language
Replies: 12
Views: 749

Re: Programming a delay in assembly language

If you don't need precise timing, you could do something like this: .delay1s LDA #50 .delay STA &70 .loop LDA #19 JSR &FFF4 DEC &70 BNE loop RTS It uses OSBYTE 19 to wait for a vertical sync (which happens 50 times per second), so 50 times round the loop gives a delay of roughly 1 sec.
by dv8
Sun Aug 30, 2020 12:38 pm
Forum: scanning of books, magazines, ads and letters
Topic: LISP on the BBC Microcomputer [Remastered PDF]
Replies: 6
Views: 1760

Re: LISP on the BBC Microcomputer [Remastered PDF]

Thanks for the huge job. I was always intrigued by the fact that Acornsoft could shoehorn a Lisp interpreter in the memory of the beeb. Thanks. I think this implementation originated on the Apple II. The ROM contains a credit to Owl Computers in 1979. I have not yet read the book but I wonder if an...
by dv8
Fri Aug 28, 2020 8:12 pm
Forum: scanning of books, magazines, ads and letters
Topic: FORTH on the BBC Microcomputer [Remastered PDF]
Replies: 6
Views: 697

Re: FORTH on the BBC Microcomputer [Remastered PDF]

I've now added an SSD disc image to the top post containing the listings and examples from the book.
by dv8
Sat Aug 22, 2020 11:05 am
Forum: scanning of books, magazines, ads and letters
Topic: FORTH on the BBC Microcomputer [Remastered PDF]
Replies: 6
Views: 697

Re: FORTH on the BBC Microcomputer [Remastered PDF]

What process do you use to do this - hardware/software. I ask because I do a lot of documentation for the educational archive and I am always willing to learn new trick. :D All my 'remastered' PDFs are re-creations of the original book, completely typeset from scratch in a DTP application. As you c...
by dv8
Fri Aug 21, 2020 3:49 pm
Forum: programming
Topic: A new BBC Micro MOS Reassembly
Replies: 32
Views: 2256

Re: A new BBC Micro MOS Reassembly

Nice work. Any plans to do the same for the B+ (OS 2.0) or Master (MOS 3.2 and 3.5) ?
by dv8
Thu Aug 20, 2020 3:44 pm
Forum: scanning of books, magazines, ads and letters
Topic: FORTH on the BBC Microcomputer [Remastered PDF]
Replies: 6
Views: 697

FORTH on the BBC Microcomputer [Remastered PDF]

Attached is a remastered PDF of the book FORTH on the BBC Microcomputer and Acorn Electron by Richard de Grandis-Harrison. The zip file contains an SSD disc image with listings and examples from the book, along with a copy of the FORTH ROM. See below for instructions on using this disc. FORTH_on_the...
by dv8
Fri Aug 14, 2020 4:44 pm
Forum: development tools
Topic: BeebAsm
Replies: 130
Views: 18072

Re: BeebAsm

tricky wrote:
Fri Aug 14, 2020 3:05 pm
I wonder if it also checks that the catalogue is OK on the supposed second disc.
That's exactly what it does, and why it often fails.
Any SSD where sectors 10 and 11 look vaguely like a catalogue will trigger the warning.
by dv8
Thu Aug 13, 2020 9:12 am
Forum: development tools
Topic: BeebAsm
Replies: 130
Views: 18072

Re: BeebAsm

^ This is caused by BeebEm trying to detect double-sided discs. It gets tripped up when sector 10 contains mostly ASCII data (i.e. values &20-&7F), as often happens in games that have instructions in their loader. The problem can be worked around, either by changing the order that files are ...

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