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The Definitive Programmer’s Guide to Using the Floating Bus Trick on the ZX Spectrum

Last post by TomD « Mon Jun 01, 2020 10:15 pm
Replies: 40
by Ast A. Moore » Tue Apr 17, 2018 2:50 pm
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As promised , I did a write-up on the subject of the floating bus. Keep in mind that this document is in its first draft stage and thus in a state of...

Last post

Very impressed with this, great for my new project where I needed to clear the sprites at at the bottom of the screen as I pushed the sprite drawing...
40 Replies

4679 Views

Last post by TomD
Mon Jun 01, 2020 10:15 pm
skoolkit generating sprites in html

Last post by pobtastic « Sun May 31, 2020 10:10 am
Replies: 10
by Profmyster » Fri Dec 27, 2019 6:14 pm
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Anyone experienced with using skoolkit and can advise how I get a 16x16pixel image using the ctrl file to generate the html image?

As normal the...

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I don't think that can be improved on, but you can never be sure when it comes to #UDGARRAY macro optimisation!

Ha! So very true :lol: and many...
10 Replies

801 Views

Last post by pobtastic
Sun May 31, 2020 10:10 am
Find all chosen sequences of bytes in memory

Last post by SkoolKid « Fri May 29, 2020 9:42 pm
Replies: 6
by Ralf » Thu May 28, 2020 9:39 pm

First post

I have a practical problem.

Let's suppose I want to find all chosen sequences of bytes in Zx Spectrum memory.

As you may guess it is related to...

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If you have a SNA, SZX or Z80 snapshot, you could use the --find option of snapinfo.py in SkoolKit. For example:

$ snapinfo.py --find 195,0,0...

6 Replies

240 Views

Last post by SkoolKid
Fri May 29, 2020 9:42 pm
SCF and CCF z80 instructions

Last post by Andrew771 « Tue May 26, 2020 3:50 pm
Replies: 10
by Morkin » Tue May 26, 2020 1:30 pm
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Ok, so similar to the there's a hover key in Jetpac?? revelation, where everyone rolls their eyes in a 'didn't you know that already?' sort of...

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Always wondered why people were more inclined to do things like OR A, as it seemed to affect other stuff a bit more that could potentially give me...
10 Replies

263 Views

Last post by Andrew771
Tue May 26, 2020 3:50 pm
What tooling to use to start zx spectrum game programming?

Last post by Mad Fritz « Tue May 26, 2020 2:23 am
Replies: 20
by oanime » Fri May 22, 2020 11:07 pm
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Hi,

I owned a zx spectrum when I was young and would like to get back into game programming on the zx spectrum. As time has passed I have ran away...

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My Russian is a bit rusty after too many years not being forced to use it :lol: - is there an English manual by any chance?

A brief English...
20 Replies

766 Views

Last post by Mad Fritz
Tue May 26, 2020 2:23 am
Kobrahsoft DB1 protection

Last post by Pegaz « Fri May 22, 2020 8:19 pm
Replies: 8
by Pegaz » Wed May 20, 2020 1:06 pm

First post

It’s been almost 10 years since the wos discussion, about disk protection in Kobrahsoft DB1 Plus 3 backup disk utility.

In that thread, some...

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Today I tried patched DB1 and several disc games with hardcore protection (After Burner, Robocop, Chase HQ 2, Wec Le Man) using DB1 and DU54, but I...

8 Replies

387 Views

Last post by Pegaz
Fri May 22, 2020 8:19 pm
Custom raster bars

Last post by Alessandro « Thu May 21, 2020 10:05 pm
Replies: 4
by TMD2003 » Thu May 21, 2020 8:35 pm

First post

Anyone who remembers me asking this on t'other forum back in the days when this forum didn't exist and wouldn't do for over a decade, pretend you...

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For a concrete example, you might be interested in taking a look at my SetoLOAD loader . It is a modification of the ROM loader coming into several...

4 Replies

171 Views

Last post by Alessandro
Thu May 21, 2020 10:05 pm
Extracting ink, paper etc. from ATTR value?

Last post by Phil2 « Wed May 20, 2020 3:09 pm
Replies: 6
by Phil2 » Tue May 19, 2020 8:23 pm

First post

Hello everyone,

Does anyone know in Basic how to extract the ink, paper, bright and flash values from an ATTR value?

I'm trying to copy a character...

Last post

That worked a treat. Copying the attributes from 0,0 to 1,0.
Perfect. Thanks again.

10 INPUT ink? ;i; paper? ;p; bright? ;b; flash? ;f
15 PRINT...

6 Replies

224 Views

Last post by Phil2
Wed May 20, 2020 3:09 pm
Tearing while scrolling attributes

Last post by Lethargeek « Wed May 20, 2020 11:39 am
Replies: 13
by dfzx » Tue May 19, 2020 5:12 pm
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I've been messing about with a bit of code which scrolls a block of attributes across the screen. Or put another way, sets the attribute display...

Last post

4-way scrolling based on inputs and events means rebuilding the 32x24 display each frame. At least at the moment.

still a very simple task if it's...
13 Replies

336 Views

Last post by Lethargeek
Wed May 20, 2020 11:39 am
New ZX Spectrum +3 Text Adventure w/ Graphics Authoring Tool

Last post by 8BitAG « Fri May 15, 2020 2:23 pm
Replies: 3
by ainslec » Fri May 15, 2020 8:37 am

First post

It is now simple to export text adventure games WITH GRAPHICS to ZX Spectrum +3 and ZX Spectrum Next from Adventuron .

Previously this...

Last post

Well, I expected something more GUI oriented. Where you can click out 90% of the game.
But actually it looks like a full programming language which...

3 Replies

257 Views

Last post by 8BitAG
Fri May 15, 2020 2:23 pm
Extruder

Last post by RMartins « Wed May 13, 2020 10:49 pm
Replies: 1
by RMartins » Tue May 12, 2020 9:19 pm

First post

Yesterday, I started to analyze some of the gameplay footage that I have made from Arcade Magical Drop II.

And it's very interesting, what one can...

Last post

Since no one tried to find the problem, let me continue on that.

The issue, is that when a POP happens, it can have a lot of balls in other columns...

1 Replies

56 Views

Last post by RMartins
Wed May 13, 2020 10:49 pm
ZXSpin labels file format

Last post by majikeyric « Tue May 12, 2020 5:06 pm
Replies: 2
by majikeyric » Tue May 12, 2020 6:51 am

First post

Hi,

I would want to import the labels of my program into ZXSpin for debugging purpose (I don't like Fuse debugger...) but that doesn't work.......

Last post

WOW very cool ! Many thanks ZXDunny ! and these symbols will be very useful as well :D

2 Replies

212 Views

Last post by majikeyric
Tue May 12, 2020 5:06 pm
A miracle when it works first time!

Last post by Cosmium « Mon May 11, 2020 2:56 am
Replies: 36
by Cosmium » Thu Aug 29, 2019 7:15 am
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Following on from the An impressive way to crash the Speccy? thread ( ), I was working on a sprite clipping m/c routine and when it came to test my...

Last post

Haha brill. How on earth did you get it to do that?!

I know, it's a ridiculous display isn't it?! I'd been tinkering with adding a write address...
36 Replies

3825 Views

Last post by Cosmium
Mon May 11, 2020 2:56 am
Happy Coding ZX Episode 6

Last post by highrise « Mon May 11, 2020 12:52 am

by highrise » Mon May 11, 2020 12:52 am

Happy Coding #6 is here.

Happy Coding ZX is a youtube channel where I dig deeper into the coding side of the ZX Spectrum with game development as...

0 Replies

134 Views

Last post by highrise
Mon May 11, 2020 12:52 am
Happy Coding ZX Episode 5

Last post by highrise « Sat May 02, 2020 11:23 am

by highrise » Sat May 02, 2020 11:23 am

is here.

If you are interested in modding games you might find it interesting.

0 Replies

254 Views

Last post by highrise
Sat May 02, 2020 11:23 am
Screen Memory - Moving screen address up one line

Last post by AndyC « Wed Apr 29, 2020 8:56 pm
Replies: 14
by MonkZy » Sun Apr 26, 2020 2:34 pm
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The Spectrums screen address layout seems very confusing at first. After some study the arrangement makes sense. If you are writing software with...

Last post

I suspect that whatever made the hardware cheaper would have been the key driver. Getting the cost down as low as possible was a big deal for...
14 Replies

712 Views

Last post by AndyC
Wed Apr 29, 2020 8:56 pm
How to Write ZX Spectrum Games v1.1 by Jonathan Cauldwell

Last post by PeterJ « Tue Apr 28, 2020 5:07 pm
Replies: 6
by PeterJ » Mon Apr 27, 2020 2:28 pm

First post

Jonathan has published an update to his guide to writing Spectrum games. We are now onto version 1.1.

Which will replace our 1.0 version:...

Last post

Fine by me R-Tape . Alessandro was quite right.

Jonathan has released a series of YouTube videos which go through MPAGD:

6 Replies

466 Views

Last post by PeterJ
Tue Apr 28, 2020 5:07 pm
"Undocumented" Z80 index register instructions

Last post by Turtle_Quality « Tue Apr 28, 2020 10:46 am
Replies: 9
by Cosmium » Sun Apr 26, 2020 11:27 pm

First post

I was intrigued coming across the extra rotate, shift, set and reset instructions you get when you add the DD CB and FD CB byte prefixes to normally...

Last post

Here's a link documenting the undocumented

More info can be found here for example a table of opcodes timings that includes the undocumented...

9 Replies

486 Views

Last post by Turtle_Quality
Tue Apr 28, 2020 10:46 am
Pixel-exact movement?

Last post by dfzx « Mon Apr 27, 2020 3:10 pm
Replies: 13
by FFoulkes » Sat Apr 25, 2020 11:04 pm
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Hi,

watching the awesome Spectrum Show , I thought about creating a retro game again.
At the moment, I'm trying to recreate the jump of Miner Willy...

Last post

I presume you don't need to be told what those floats are doing for the poor Z80? :)
13 Replies

728 Views

Last post by dfzx
Mon Apr 27, 2020 3:10 pm
Question about Dk'tronics Minder

Last post by djnzx48 « Mon Apr 27, 2020 11:01 am
Replies: 1
by OldGamer » Sun Apr 26, 2020 10:14 pm

First post

Does anyone know roughly how the face generator was coded?

I am in the process of making a Minder 'clone' and wondering how to do the seemingly...

Last post

I'm not really familiar with this game, but from what I can tell, the face drawing routine starts at $dd4e and calls a subroutine at $dc91 to draw...

1 Replies

213 Views

Last post by djnzx48
Mon Apr 27, 2020 11:01 am
Beginner's Sprite Tutorial

Last post by PeterJ « Sun Apr 26, 2020 5:38 pm
Replies: 54
by R-Tape » Sat Dec 23, 2017 9:56 pm
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After a few chats with Peter I promised to do a beginner's sprite tutorial, and it also follows another topic about whether beginner's asm is okay to...

Last post

R-Tape . Is there any chance you could do versions of your examples to cover up and down from here please:
54 Replies

9308 Views

Last post by PeterJ
Sun Apr 26, 2020 5:38 pm
looking for a gnu/linux commandline-based tool like mctrd for creating +3 .dsk files

Last post by dom « Fri Apr 24, 2020 11:48 pm
Replies: 1
by nitrofurano » Tue Apr 21, 2020 7:25 pm

First post

hi everyone!

i'm looking for a gnu/linux commandline-based tool like that amazingly neat mctrd ( ), for creating +3 .dsk files

or at least being...

Last post

I added support to appmake from z88dk to create bootable +3 discs a while back, it may be of use, though it is tuned for working with z88dk....

1 Replies

237 Views

Last post by dom
Fri Apr 24, 2020 11:48 pm
ULA Snow and the IY/IX registers - A question

Last post by Ast A. Moore « Sun Apr 19, 2020 7:34 pm
Replies: 12
by MonkZy » Sat Apr 18, 2020 11:07 am
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Last night I spent a couple of hours trying to eliminate a bug which caused strange pixels to appear on the screen. I had recently discovered the...

Last post

It looks better on an emulator than my crumby GIF.

It looks pretty darned good from where I’m standing! Keep on working on it.
12 Replies

676 Views

Last post by Ast A. Moore
Sun Apr 19, 2020 7:34 pm
Crashing Super Wonder Boy

Last post by jpnz « Fri Apr 17, 2020 1:39 am
Replies: 7
by jpnz » Tue Apr 07, 2020 6:18 am

First post

I'm revisiting some fixes for Super Wonder Boy (wow, from 7 years ago!) and noted a method to reliably cause the game to crash with emulated models...

Last post

So my question is - why is the ROM interupt handler get hit? A timing thing?

No. Code execution flies off into a data area and eventually hits...

7 Replies

558 Views

Last post by jpnz
Fri Apr 17, 2020 1:39 am
ChesSkelet: micro chess program - 363 Bytes

Last post by reeagbo « Thu Apr 16, 2020 11:24 pm
Replies: 67
by reeagbo » Tue Apr 30, 2019 3:44 pm
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Hi all,

I discovered this forum few days ago and after some exchanges with Arkannoyed on his fantastic 3D Chess, he encouraged me to open a thread...

Last post

Right! You could have helped me with my program! Anyway, I meant bytes.

With chesskelet it happened to me that I had all regular registers...
67 Replies

6707 Views

Last post by reeagbo
Thu Apr 16, 2020 11:24 pm

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