Search found 206 matches

by dv8
Fri May 17, 2019 1:49 pm
Forum: programming
Topic: Assembly language text adventure
Replies: 74
Views: 1873

Re: Assembly language text adventure

BASIC's stack grows downwards from HIMEM and is used for storing copies of variables during PROC and FN calls and the intermediate results of string expressions. The latter is why you are seeing string fragments just below HIMEM at &7C00. A BASIC program has the potential to use all of the memory be...
by dv8
Thu Apr 18, 2019 10:31 am
Forum: hardware
Topic: Logo ROM playing up. Needs replacing?
Replies: 10
Views: 295

Re: Logo ROM playing up. Needs replacing?

Yes, it was Logotron.
There is a ROM image in this post.
by dv8
Thu Apr 18, 2019 9:24 am
Forum: hardware
Topic: Logo ROM playing up. Needs replacing?
Replies: 10
Views: 295

Re: Logo ROM playing up. Needs replacing?

Kazzie wrote:
Wed Apr 17, 2019 7:16 pm
Other than the number of chips used, what differences are there between the implementations of Logo?
There is a fairly comprehensive article in Acorn User issue 34 (May 1985) comparing the different implementations.
by dv8
Wed Apr 17, 2019 1:23 pm
Forum: hardware
Topic: Logo ROM playing up. Needs replacing?
Replies: 10
Views: 295

Re: Logo ROM playing up. Needs replacing?

That looks more like Acornsoft Logo which was supplied on two ROMs.
The behaviour you are seeing is what happens when ROM 1 is missing or corrupted.
by dv8
Fri Apr 12, 2019 3:26 pm
Forum: software: other
Topic: Getting a image on to BBC
Replies: 7
Views: 266

Re: Getting a image on to BBC

Only got it to work on in the BBC B+ Mode. Try changing line 40 in the LOADER program to: 40*LOAD PHABGAM FFFF3000 or disable the Pi co-processor with: *FX151,230,14 If you're going to be playing games you will probably need to disable the co-pro anyway. Most games won't run properly with the Tube ...
by dv8
Thu Apr 11, 2019 11:11 am
Forum: hardware
Topic: BBC B+ thinks it's a BBC A?
Replies: 19
Views: 602

Re: BBC B+ thinks it's a BBC A?

The MODE command calls OSBYTE 133 (&85) to get the base address of screen memory for a given mode. It reports a 'Bad mode' error if this address is below LOMEM. It could be worth checking what values are returned from OSBYTE 133. When it goes wrong again try the following command: FOR X%=0 TO 7:A%=1...
by dv8
Sat Apr 06, 2019 3:23 pm
Forum: software: classic games
Topic: Who's ready for... guess that game! ;D
Replies: 52
Views: 1349

Re: Who's ready for... guess that game! ;D

Correct, it's Bumble Bee. =D>
by dv8
Sat Apr 06, 2019 10:19 am
Forum: software: classic games
Topic: Who's ready for... guess that game! ;D
Replies: 52
Views: 1349

Re: Who's ready for... guess that game! ;D

No-one? Okay, here's a clue:

guess_the_game.png
guess_the_game.png (549 Bytes) Viewed 214 times
by dv8
Fri Apr 05, 2019 11:41 am
Forum: community projects
Topic: Acorn Graphics Extension ROM User Guide
Replies: 14
Views: 445

Re: Acorn Graphics Extension ROM User Guide

A corrected version of the main user guide has now been added to the opening post.
by dv8
Fri Apr 05, 2019 11:32 am
Forum: software: classic games
Topic: Who's ready for... guess that game! ;D
Replies: 52
Views: 1349

Re: Who's ready for... guess that game! ;D

One more tune:

*PLAY @48 O3 SGA IBG S^CB QA S#FG IA#F SGB Q^D
by dv8
Thu Apr 04, 2019 7:48 pm
Forum: software: classic games
Topic: Who's ready for... guess that game! ;D
Replies: 52
Views: 1349

Re: Who's ready for... guess that game! ;D

Yep! It was Banana Man =D>
by dv8
Thu Apr 04, 2019 7:43 pm
Forum: software: other
Topic: PLAY Command
Replies: 8
Views: 537

Re: PLAY Command

If you are booting the disc it will install the *LINE handler and raise PAGE to &2100. Since "PLAY" loads at &2100, running a *PLAY command in this state will overwrite the BASIC program. Either run the example program above without booting the disc or change *PLAY to *LINE in line 40. The boot envi...
by dv8
Thu Apr 04, 2019 3:10 pm
Forum: software: classic games
Topic: Who's ready for... guess that game! ;D
Replies: 52
Views: 1349

Re: Who's ready for... guess that game! ;D

Yes, it's Monsters.

Considering you both posted within a minute of each other we'll call it a draw!

Now for something a little more obscure:

ENVELOPE 1,1,0,0,0,0,0,0,127,-4,-71,-3,127,0
*PLAY =! N1 =,2 O3 I ^#F,^D, ;75 ^D,A, ^D,B, ^D,A, ;100 B,G, A,#F, ^D,A
by dv8
Thu Apr 04, 2019 2:56 pm
Forum: software: other
Topic: PLAY Command
Replies: 8
Views: 537

Re: PLAY Command

As it stands there's no way the PLAY command could run under interrupt, the way some of the options work would need to change. It would have to be a separate version of the program, not terribly difficult but not trivial either. In the very early pre-release versions there was an option to detect a ...
by dv8
Thu Apr 04, 2019 11:12 am
Forum: software: classic games
Topic: Who's ready for... guess that game! ;D
Replies: 52
Views: 1349

Re: Who's ready for... guess that game! ;D

Are you using the latest version? (8th chords were added in version 1.02).
by dv8
Thu Apr 04, 2019 10:20 am
Forum: software: classic games
Topic: Who's ready for... guess that game! ;D
Replies: 52
Views: 1349

Re: Who's ready for... guess that game! ;D

Let's try another musical one. In no way is this a blatant attempt to try and get more interest in a project of mine that seems to have fallen flat on its face. :^o Grab the SSD from this post , mount the disc then enter (or copy+paste) the following command: *PLAY O1 t-5 I R3: Cp8 Ep8 Gp8 Ep8 : H C...
by dv8
Wed Apr 03, 2019 2:55 pm
Forum: software: other
Topic: PLAY Command
Replies: 8
Views: 537

Re: PLAY Command

Updated to version 1.02 New disc, ROM and documentation links in first post . Changes: Added double note length ( d ) and halve note length ( l ) commands Added =K option to select whether chord notes are synchronized Added new chord types 8 {0,12,12} and pow8 {0,12,24} ROM version only: ? command n...
by dv8
Wed Apr 03, 2019 11:46 am
Forum: software: classic games
Topic: Who's ready for... guess that game! ;D
Replies: 52
Views: 1349

Re: Who's ready for... guess that game! ;D

chrisn wrote:
Wed Apr 03, 2019 11:25 am
Estra!
We have a winner! =D>
by dv8
Wed Apr 03, 2019 11:02 am
Forum: software: classic games
Topic: Who's ready for... guess that game! ;D
Replies: 52
Views: 1349

Re: Who's ready for... guess that game! ;D

Nope! None of the above.
It's not as obvious as it appears to be.
by dv8
Wed Apr 03, 2019 10:14 am
Forum: software: classic games
Topic: Who's ready for... guess that game! ;D
Replies: 52
Views: 1349

Re: Who's ready for... guess that game! ;D

Okay, here's a sneaky one:
(it's a Beeb game)

guess_the_game.png
guess_the_game.png (936 Bytes) Viewed 294 times
by dv8
Tue Apr 02, 2019 3:44 pm
Forum: community projects
Topic: Acorn Graphics Extension ROM User Guide
Replies: 14
Views: 445

Re: Acorn Graphics Extension ROM User Guide

I've now added PDFs for the Reference Card and keystrip to the opening post. Thanks to Lardo for the scans.

Lurkio has also found an error on page 16 of the main guide. I'll leave it a day or two to see if any other errors are discovered and then reissue a corrected PDF.
by dv8
Tue Apr 02, 2019 11:15 am
Forum: community projects
Topic: Acorn Graphics Extension ROM User Guide
Replies: 14
Views: 445

Re: Acorn Graphics Extension ROM User Guide

Lardo Boffin wrote:
Tue Apr 02, 2019 11:03 am
I only have a cheap and cheerful scanner but here goes.
Perfect, thanks.
I should be able to get the PDF done later today.
by dv8
Tue Apr 02, 2019 9:22 am
Forum: community projects
Topic: Acorn Graphics Extension ROM User Guide
Replies: 14
Views: 445

Re: Acorn Graphics Extension ROM User Guide

That looks terrific! It must have taken ages to get it that good! Thanks. Short books like this really don't take too long, especially when they have a bunch of listings that can just be copy+pasted. Thanks for these, does it happen to mention any differences between this and the built in version o...
by dv8
Mon Apr 01, 2019 9:29 pm
Forum: community projects
Topic: Acorn Graphics Extension ROM User Guide
Replies: 14
Views: 445

Acorn Graphics Extension ROM User Guide

Attached is a remastered PDF of the Acorn Graphics Extension ROM user guide. In the zip file is the GXR ROM and an SSD disc image containing the listings from the manual and extra programs from a cassette originally supplied with the ROM. If anyone has a copy of the GXR Reference Card that was also ...
by dv8
Thu Mar 21, 2019 2:56 pm
Forum: community projects
Topic: Computer Concepts Speech ROM Instruction Manual
Replies: 0
Views: 149

Computer Concepts Speech ROM Instruction Manual

Attached is a remastered PDF of the Computer Concepts Speech ROM Instruction Manual . The zip file also includes an SSD disc image containing the listings and examples from the manual. Boot the disc with Shift+Break to run the demo program. Enter the command *TYPE !INDEX to get an index of the files...
by dv8
Thu Mar 21, 2019 2:44 pm
Forum: community projects
Topic: Acorn Speech System User Guide
Replies: 1
Views: 135

Acorn Speech System User Guide

Attached is a remastered PDF of the Acorn Speech System User Guide.

The zip file also includes an SSD disc image containing the listings from the manual.

Speech_System_User_Guide.zip
(264.88 KiB) Downloaded 24 times
by dv8
Wed Mar 20, 2019 11:52 am
Forum: software: other
Topic: PLAY Command
Replies: 8
Views: 537

Re: PLAY Command

Updated to version 1.01. Download links in opening post . Made a couple of small improvements and added a preliminary ROM version. One thing I notice is PROC_PLAY() used suffixed not modifiers, so eg C C# D D# E F F# G G# A A# B. I think I also used note+octave, so eg CC+1C+2 would be a chord of thr...
by dv8
Sun Mar 17, 2019 2:57 pm
Forum: stardot.org.uk
Topic: Attachment types permitted
Replies: 11
Views: 807

Re: Attachment types permitted

Any chance of adding .rom files to the list? [-o<

The board already allows .ssd and .dsd disc images, it would be nice to be able to attach ROM images too without having to zip them first.
by dv8
Fri Mar 15, 2019 12:57 pm
Forum: general
Topic: Ideas please for better beep when Second Processor is present
Replies: 34
Views: 1127

Re: Ideas please for better beep when Second Processor is present

Thought I'd have a go at making a version of the PLAY command for the Beeb. The results are in this thread . Here are a couple of the earlier listings converted to PLAY format: Micro Live ENVELOPE 1,1, 1,-1,0, 2,2,0, 27,0,-1,-1,110,0 *PLAY L4_,L2_,, N1 O4 I G" #D" ~#A" H C" 2001 *PLAY @48 U13 V3 &2 ...