SizeCoding - User contributions [en]

Dragon 32/64

2024-04-13T13:45:00Z

ToBach:

== Dragon32 / Dragon64 ==
The Dragon 32 and Dragon 64 are home computers that were built in the 1980s. The Dragons are very similar to the TRS-80 Color Computer, and were produced for the European market by Dragon Data, Ltd., initially in Swansea, Wales before moving to Port Talbot, Wales (until 1984) and by Eurohard S.A. in Casar de Cáceres, Spain (from 1984 to 1987), and for the US market by Tano Corporation of New Orleans, Louisiana. The model numbers reflect the primary difference between the two machines, which have 32 and 64 kilobytes of RAM, respectively.

=== Setting up ===
To set up your , first get the following tools:

* Assembler: asm6809 ( https://www.6809.org.uk/asm6809/ )
* Emulator(s): xroar ( https://www.6809.org.uk/xroar/ )

=== Memory map ===

<syntaxhighlight lang="6809">
$0000-03ff System variables
$0400-05ff Default Text screen
$0600-1dff Available graphics pages w/o DOS
$0600-0bff DOS - workspace area see also $00ea-$00f6
$0600-0dff CoCo DOS workspace area (no more info)
$0c00-23ff DOS - Available graphics pages
$8000-bfff BASIC ROM in 32K mode
$8000-9fff CoCo - Extended Color BASIC ROM
$a000-bfff CoCo - Color BASIC ROM
$bff0-bfff These addresses mapped from ROM to $fff0-$ffff by the SAM
$c000-dfff DOS - Dos ROM
$c000-feff DOS - Cumana DOS ROM only
$c000-feff Available address range to cartridge expansion port 32K mode
$c000-feff D64 - 64K mode - copy of BASIC ROM 2 exists in RAM here
$ff00-ff48 PIA / D64 / DOS Control and Data registers
$ffc0-ffdf SAM (Synchronous Address Multiplexer) register bits - use
even address to clear, odd address to set
$ffec-ffef PC-Dragon - Used by Paul Burgin's emulator to provide enhanced
services
$fff0-ffff 6809 interrupt vectors mapped from $bff0-$bfff by SAM
</syntaxhighlight>

Check out http://dragon32.info/info/memmap.html for a complete memory map

=== Video display ===
The Dragon uses the Motorola 6847 VDG, it has the following native video modes:
{| class="wikitable"
|-
! Mode !! RAM Used !! Resolution !! Colours
|-
| Alphanumeric (IA) || 512 || 32x16 || Up to 11*
|-
| D || 1,024 || 64x64 || 4
|-
| E || 1,024 || 128x64 || 2
|-
| F || 1,536|| 128x64 || 4
|-
| PMODE0 || 1,536 || 128x96 || 2
|-
| PMODE1 || 3,072 || 128x96 || 4
|-
| PMODE2 || 3,072 || 128x192 || 2
|-
| PMODE3 || 6,144 || 128x192 || 4
|-
| PMODE4 || 6,144 || 256x192 || 2
|}

You can also use what are called "Semigraphics" modes, where you can increase the rows of characters displayed in the alphanumeric modes, and write to it like a bitmap, giving you a resolution of up to 64x192. However this will not be covered in this article (yet).

==== Sync with frame ====
Syncing with VSYNC can be done in a few ways, the most common being:
<syntaxhighlight lang="6502">
wait_for_vsync
lda $ff03 ;polling vsync
bpl wait_for_vsync
lda $ff02 ;acknowledge vsync
;rest of your code...
</syntaxhighlight>

If you really want to save the bytes, it can be done with just one instruction. However it will not only wait for VSYNC but also other system interrupts that may be going on, so don't expect 100% reliability. It will also do the acknowledgement for you.
<syntaxhighlight lang="6502">
sync
;rest of your code...
</syntaxhighlight>

==== Plot in Bitmap modes ====
Here is a routine that will allow you to plot a single point in bitmap mode.
<syntaxhighlight lang="6502">
To be added
</syntaxhighlight>

==== Text mode ====
To be added
<syntaxhighlight lang="6502">
To be added
</syntaxhighlight>

=== Sound ===
To be added soon.

==== Make some noise ====
To be added soon.

=== Additional Resources ===
* Dragon32 Info page - http://dragon32.info/
* World of Dragon forums - https://archive.worldofdragon.org/phpBB3/
* 6809.org.uk Website - https://www.6809.org.uk/
* CoCoCoding - https://sites.google.com/a/aaronwolfe.com/cococoding/home

Dragon 32/64

2024-04-13T13:33:10Z

ToBach: /* Sync with frame */

== Dragon32 / Dragon64 ==
The Dragon 32 and Dragon 64 are home computers that were built in the 1980s. The Dragons are very similar to the TRS-80 Color Computer, and were produced for the European market by Dragon Data, Ltd., initially in Swansea, Wales before moving to Port Talbot, Wales (until 1984) and by Eurohard S.A. in Casar de Cáceres, Spain (from 1984 to 1987), and for the US market by Tano Corporation of New Orleans, Louisiana. The model numbers reflect the primary difference between the two machines, which have 32 and 64 kilobytes of RAM, respectively.

=== Setting up ===
To set up your , first get the following tools:

* Assembler: asm6809 ( https://www.6809.org.uk/asm6809/ )
* Emulator(s): xroar ( https://www.6809.org.uk/xroar/ )

=== Memory map ===

<syntaxhighlight lang="6809">
$0000-03ff System variables
$0400-05ff Default Text screen
$0600-1dff Available graphics pages w/o DOS
$0600-0bff DOS - workspace area see also $00ea-$00f6
$0600-0dff CoCo DOS workspace area (no more info)
$0c00-23ff DOS - Available graphics pages
$8000-bfff BASIC ROM in 32K mode
$8000-9fff CoCo - Extended Color BASIC ROM
$a000-bfff CoCo - Color BASIC ROM
$bff0-bfff These addresses mapped from ROM to $fff0-$ffff by the SAM
$c000-dfff DOS - Dos ROM
$c000-feff DOS - Cumana DOS ROM only
$c000-feff Available address range to cartridge expansion port 32K mode
$c000-feff D64 - 64K mode - copy of BASIC ROM 2 exists in RAM here
$ff00-ff48 PIA / D64 / DOS Control and Data registers
$ffc0-ffdf SAM (Synchronous Address Multiplexer) register bits - use
even address to clear, odd address to set
$ffec-ffef PC-Dragon - Used by Paul Burgin's emulator to provide enhanced
services
$fff0-ffff 6809 interrupt vectors mapped from $bff0-$bfff by SAM
</syntaxhighlight>

Check out http://dragon32.info/info/memmap.html for a complete memory map

=== Video display ===
The Dragon 32 / Dragon 64 have the following native video modes:
* Standard text modes
* Bitmap modes

==== Sync with frame ====
Syncing with VSYNC can be done in a few ways, the most common being:
<syntaxhighlight lang="6502">
wait_for_vsync
lda $ff03 ;polling vsync
bpl wait_for_vsync
lda $ff02 ;acknowledge vsync
;rest of your code...
</syntaxhighlight>

If you really want to save the bytes, it can be done with just one instruction. However it will not only wait for VSYNC but also other system interrupts that may be going on, so don't expect 100% reliability. It will also do the acknowledgement for you.
<syntaxhighlight lang="6502">
sync
;rest of your code...
</syntaxhighlight>

==== Plot in Bitmap modes ====
Here is a routine that will allow you to plot a single point in bitmap mode.
<syntaxhighlight lang="6502">
To be added
</syntaxhighlight>

==== Text mode ====
To be added
<syntaxhighlight lang="6502">
To be added
</syntaxhighlight>

=== Sound ===
To be added soon.

==== Make some noise ====
To be added soon.

=== Additional Resources ===
* Dragon32 Info page - http://dragon32.info/
* World of Dragon forums - https://archive.worldofdragon.org/phpBB3/
* 6809.org.uk Website - https://www.6809.org.uk/
* CoCoCoding - https://sites.google.com/a/aaronwolfe.com/cococoding/home

Dragon 32/64

2024-04-13T13:31:26Z

ToBach: /* Sync with frame */

== Dragon32 / Dragon64 ==
The Dragon 32 and Dragon 64 are home computers that were built in the 1980s. The Dragons are very similar to the TRS-80 Color Computer, and were produced for the European market by Dragon Data, Ltd., initially in Swansea, Wales before moving to Port Talbot, Wales (until 1984) and by Eurohard S.A. in Casar de Cáceres, Spain (from 1984 to 1987), and for the US market by Tano Corporation of New Orleans, Louisiana. The model numbers reflect the primary difference between the two machines, which have 32 and 64 kilobytes of RAM, respectively.

=== Setting up ===
To set up your , first get the following tools:

* Assembler: asm6809 ( https://www.6809.org.uk/asm6809/ )
* Emulator(s): xroar ( https://www.6809.org.uk/xroar/ )

=== Memory map ===

<syntaxhighlight lang="6809">
$0000-03ff System variables
$0400-05ff Default Text screen
$0600-1dff Available graphics pages w/o DOS
$0600-0bff DOS - workspace area see also $00ea-$00f6
$0600-0dff CoCo DOS workspace area (no more info)
$0c00-23ff DOS - Available graphics pages
$8000-bfff BASIC ROM in 32K mode
$8000-9fff CoCo - Extended Color BASIC ROM
$a000-bfff CoCo - Color BASIC ROM
$bff0-bfff These addresses mapped from ROM to $fff0-$ffff by the SAM
$c000-dfff DOS - Dos ROM
$c000-feff DOS - Cumana DOS ROM only
$c000-feff Available address range to cartridge expansion port 32K mode
$c000-feff D64 - 64K mode - copy of BASIC ROM 2 exists in RAM here
$ff00-ff48 PIA / D64 / DOS Control and Data registers
$ffc0-ffdf SAM (Synchronous Address Multiplexer) register bits - use
even address to clear, odd address to set
$ffec-ffef PC-Dragon - Used by Paul Burgin's emulator to provide enhanced
services
$fff0-ffff 6809 interrupt vectors mapped from $bff0-$bfff by SAM
</syntaxhighlight>

Check out http://dragon32.info/info/memmap.html for a complete memory map

=== Video display ===
The Dragon 32 / Dragon 64 have the following native video modes:
* Standard text modes
* Bitmap modes

==== Sync with frame ====
Syncing with VSYNC can be done in a few ways, the most common being:
<syntaxhighlight lang="6502">
vskip
lda $ff03 ;polling vsync
bpl vskip
lda $ff02 ;acknowledge vsync
;rest of your code...
</syntaxhighlight>

If you really want to save the bytes, it can be done with just one instruction. However it will not only wait for VSYNC but also other system interrupts that may be going on, so don't expect 100% reliability. It will also do the acknowledgement for you.
<syntaxhighlight lang="6502">
sync
;rest of your code...
</syntaxhighlight>

==== Plot in Bitmap modes ====
Here is a routine that will allow you to plot a single point in bitmap mode.
<syntaxhighlight lang="6502">
To be added
</syntaxhighlight>

==== Text mode ====
To be added
<syntaxhighlight lang="6502">
To be added
</syntaxhighlight>

=== Sound ===
To be added soon.

==== Make some noise ====
To be added soon.

=== Additional Resources ===
* Dragon32 Info page - http://dragon32.info/
* World of Dragon forums - https://archive.worldofdragon.org/phpBB3/
* 6809.org.uk Website - https://www.6809.org.uk/
* CoCoCoding - https://sites.google.com/a/aaronwolfe.com/cococoding/home

Dragon 32/64

2024-04-13T13:30:40Z

ToBach: /* Sync with frame */

== Dragon32 / Dragon64 ==
The Dragon 32 and Dragon 64 are home computers that were built in the 1980s. The Dragons are very similar to the TRS-80 Color Computer, and were produced for the European market by Dragon Data, Ltd., initially in Swansea, Wales before moving to Port Talbot, Wales (until 1984) and by Eurohard S.A. in Casar de Cáceres, Spain (from 1984 to 1987), and for the US market by Tano Corporation of New Orleans, Louisiana. The model numbers reflect the primary difference between the two machines, which have 32 and 64 kilobytes of RAM, respectively.

=== Setting up ===
To set up your , first get the following tools:

* Assembler: asm6809 ( https://www.6809.org.uk/asm6809/ )
* Emulator(s): xroar ( https://www.6809.org.uk/xroar/ )

=== Memory map ===

<syntaxhighlight lang="6809">
$0000-03ff System variables
$0400-05ff Default Text screen
$0600-1dff Available graphics pages w/o DOS
$0600-0bff DOS - workspace area see also $00ea-$00f6
$0600-0dff CoCo DOS workspace area (no more info)
$0c00-23ff DOS - Available graphics pages
$8000-bfff BASIC ROM in 32K mode
$8000-9fff CoCo - Extended Color BASIC ROM
$a000-bfff CoCo - Color BASIC ROM
$bff0-bfff These addresses mapped from ROM to $fff0-$ffff by the SAM
$c000-dfff DOS - Dos ROM
$c000-feff DOS - Cumana DOS ROM only
$c000-feff Available address range to cartridge expansion port 32K mode
$c000-feff D64 - 64K mode - copy of BASIC ROM 2 exists in RAM here
$ff00-ff48 PIA / D64 / DOS Control and Data registers
$ffc0-ffdf SAM (Synchronous Address Multiplexer) register bits - use
even address to clear, odd address to set
$ffec-ffef PC-Dragon - Used by Paul Burgin's emulator to provide enhanced
services
$fff0-ffff 6809 interrupt vectors mapped from $bff0-$bfff by SAM
</syntaxhighlight>

Check out http://dragon32.info/info/memmap.html for a complete memory map

=== Video display ===
The Dragon 32 / Dragon 64 have the following native video modes:
* Standard text modes
* Bitmap modes

==== Sync with frame ====
Syncing with VSYNC can be done in a few ways, the most common being:
<syntaxhighlight lang="6502">
vskip
lda $ff03 ;polling vsync
bpl vskip
lda $ff02 ;acknowledge vsync
;rest of your code...
</syntaxhighlight>

However if you really want to save the bytes, it can be done with just one instruction. However it will not only wait for VSYNC but also other system interrupts that may be going on, so don't expect 100% reliability.
<syntaxhighlight lang="6502">
sync
;rest of your code...
</syntaxhighlight>

==== Plot in Bitmap modes ====
Here is a routine that will allow you to plot a single point in bitmap mode.
<syntaxhighlight lang="6502">
To be added
</syntaxhighlight>

==== Text mode ====
To be added
<syntaxhighlight lang="6502">
To be added
</syntaxhighlight>

=== Sound ===
To be added soon.

==== Make some noise ====
To be added soon.

=== Additional Resources ===
* Dragon32 Info page - http://dragon32.info/
* World of Dragon forums - https://archive.worldofdragon.org/phpBB3/
* 6809.org.uk Website - https://www.6809.org.uk/
* CoCoCoding - https://sites.google.com/a/aaronwolfe.com/cococoding/home

6809

2024-04-13T01:48:10Z

ToBach:

== Introduction ==
Wanting to start sizecoding on a 6809 platform in this day and age can be tough.
So here is a bit of help to get you started:

== 6809 Based Plaforms ==
*'''[[Dragon 32/64]]''' - Dragon Sizecoding information
*'''[[Vectrex]]''' - Vectrex Sizecoding information

== The 6809 CPU ==
=== Registers ===

These are the internal registers of the 6809:

* A + B (D): Two 8-bit accumulators which can be combined into one 16-bit accumulator.
* X + Y: Two 16-bit index registers.
* S + U: Two 16-bit stack pointers, which can also be used as index registers.
* PC: 16-bit Program Counter
* DP: 8-bit Direct Page value, a pointer to a page in RAM to set the Direct Page (Moveable Zero Page)
* CC: 8-bit Condition Codes

== Instruction Set ==
The 6502's instruction set was inspired by the 6800 series (Predecessor to the 6809), so there are a few similarities between the two.
If you are coming from a 6502 background, you may get the jist of it sooner than others.

Here is a handy sheet with all the instructions of the 6809: https://www.chibiakumas.com/6809/CheatSheet.pdf

== Techniques ==
=== Stack Blasting ===
The 6809 has quick methods of pushing and pulling registers onto and off the stack, which only take 5 cycles plus one per byte you are pushing/pulling. This can be used for fast memory copying.

Although the 6809 does have auto-incrementing it can take up to 16 cycles per two bytes to copy. With stack blasting we can speed it up to 7 bytes in 24 cycles.

Due to using almost every register you will have to back up certain registers before utilising this method.
<syntaxhighlight lang="nasm">
;The conventional method:
LDX #SOURCE
LDY #DESTINATION
LDD ,X++
STD ,Y++

;Stack blasting:
LDS #SOURCE
LDU #DESTINATION
PULS D,X,Y,DP
PSHU D,X,Y,DP
</syntaxhighlight>

Main Page

2024-04-13T01:28:17Z

ToBach:

== Welcome to SizeCoding.org! ==

'''SizeCoding.org is a wiki dedicated to the art of creating very tiny programs for most popular types of CPUs. As sizecoding is also popular on other hardware, we recently opened the website for other platforms as well, check the links below.'''

By "very tiny programs", we mean programs that are '''256 bytes or less in size''', typically created by members of the [https://en.wikipedia.org/wiki/Demoscene demoscene] as a show of programming skill. The size of these tiny programs is measured by their total size in opcode bytes, and are usually presented as an executable binary.

'''Despite their tiny size, these programs are able to produce amazing graphical displays, playable games, and sometimes music.''' There are even some surprisingly effective programs in just '''16 bytes''' [https://demozoo.org/productions/?platform=&production_type=55] or even '''8 bytes''' [https://demozoo.org/productions/?platform=&production_type=54].

'''The intent of this wiki is to teach assembler programmers the various techniques used to create tiny demoscene intros.'''
While these techniques can be used for other applications (boot sectors, ROM, BIOS and firmware code, etc.), the information presented here is firmly oriented towards the demoscene. Practicality and common sense are sometimes thrown out the window just to shave a single byte. Consider yourself warned.

Here is the list of active platforms available on this wiki:

*'''[[Windows]]''' - Sizecoding for Windows.
*'''[[Fantasy consoles]]''' - Fantasy Consoles (TIC-80 , PICO-8, MicroW8), Processing and other Virtual Machine languages (such as JavaScript).
*'''[[DOS]]''' - Sizecoding for X86 / DOS.
*'''[[Linux]]''' - Sizecoding for Linux.
*'''[[ARM]]''' - ARM-based platforms (RISC OS, Acorn Archimedes, Gameboy Advance, etc.)
*'''[[RISC-V]]''' - RISC−V micro-processors.
*'''[[ReGIS]]''' - VT125, VT230, VT240/241 and more terminal display vector graphics language.
*'''[[Bytebeat]]''' - Tiny music created from mathematical expressions.

8-bit and 16-bit platforms:
*'''[[Motorola 68000]]''' - Commodore Amiga, Atari ST, Atari Jaguar, Spectrum QL, etc.
*'''[[6502]]''' - Commodore 64, Atari XE/XL, Apple II, Atari Lynx, BBC Micro, etc.
*'''[[Z80]]''' - ZX Spectrum, Amstrad CPC, etc.
*'''[[PDP-11]]''' - BK-0010 / BK-0011, etc.
*'''[[6809]]''' - Dragon 32/64, Tandy CoCo, Vectrex, etc.

6809

2024-04-13T01:26:00Z

ToBach: created page and added basic information

== Introduction ==
Wanting to start sizecoding on a 6809 platform in this day and age can be tough.
So here is a bit of help to get you started:

== 6809 Based Plaforms ==
*'''[[Dragon 32/64]]''' - Dragon Sizecoding information
*'''[[Vectrex]]''' - Vectrex Sizecoding information

== The 6809 CPU ==
=== Registers ===
The 6502's instruction set was inspired by the 6800 series (Predecessor to the 6809), so there are a few similarities between the two.
If you are coming from a 6502 background, you may get the jist of it sooner than others.

These are the internal registers of the 6809:

* A + B (D): Two 8-bit accumulators which can be combined into one 16-bit accumulator.
* X + Y: Two 16-bit index registers.
* S + U: Two 16-bit stack pointers, which can also be used as index registers.
* PC: 16-bit Program Counter
* DP: 8-bit Direct Page value, a pointer to a page in RAM to set the Direct Page (Moveable Zero Page)
* CC: 8-bit Condition Codes

== Instruction Set ==
Here is a handy sheet with all the instructions of the 6809: https://www.chibiakumas.com/6809/CheatSheet.pdf

== Techniques ==
=== Stack Blasting ===
The 6809 has quick methods of pushing and pulling registers onto and off the stack, which only take 5 cycles plus one per byte you are pushing/pulling. This can be used for fast memory copying.

Although the 6809 does have auto-incrementing it can take up to 16 cycles per two bytes to copy. With stack blasting we can speed it up to 7 bytes in 24 cycles.

Due to using almost every register you will have to back up certain registers before utilising this method.
<syntaxhighlight lang="nasm">
;The conventional method:
LDX #SOURCE
LDY #DESTINATION
LDD ,X++
STD ,Y++

;Stack blasting:
LDS #SOURCE
LDU #DESTINATION
PULS D,X,Y,DP
PSHU D,X,Y,DP
</syntaxhighlight>

Acorn Archimedes

2024-04-08T19:50:21Z

ToBach: added assembler and emulator

== Acorn Archimedes ==
Acorn Archimedes is a family of personal computers designed by Acorn Computers of Cambridge, England. The systems are based on Acorn's own ARM architecture processors and the proprietary operating systems Arthur and RISC OS. The first models were introduced in 1987, and systems in the Archimedes family were sold until the mid-1990s.

The ARM RISC design, a 32-bit CPU (using 26-bit addressing), running at 8 MHz, was stated as achieving 4 MIPS, which provided a significant upgrade from 8-bit home computers, such as Acorn's previous machines.

=== Setting up ===
Setting up your development platform for the Gameboy Advance:

* Assembler: - vasm ( http://sun.hasenbraten.de/vasm/ )
* Emulator(s): - Arculator ( https://b-em.bbcmicro.com/arculator/ )

=== Video display ===
To be added

==== Getting something on screen ====
To be added soon.

=== Sound ===
To be added

==== Make some noise ====
To be added soon.

=== Additional Resources ===
* [https://demozoo.org/productions/?platform=35&production_type=19] - Tiny Intros for the Acorn Archimedes

BBC Micro

2024-04-08T15:42:50Z

ToBach: updated assembler and emulators and added some additional hardware information

== BBC Micro / Acorn Electron ==
The Acorn 8-bit systems consist of a 6502 processor @ 2MHz (65SC12 in Master 128) with a 6845 CRTC for bitmap graphics, SAA5050 for teletext graphics, and a TI SN76489 sound chip.

=== Setting up ===
To set up your , first get the following tools:

* Assembler: BeebAsm ( https://github.com/stardot/beebasm )
* Emulator(s): BeebEm, b2 ( http://www.mkw.me.uk/beebem/ ) ( https://github.com/tom-seddon/b2 )

=== Memory map ===

<syntaxhighlight lang="6502">
0000 Current Language Zero Page
0090 Operating System Zero Page
0100 Processor Stack
0200 Operating System Workspace
0300
0400 Current Language Workspace
0500
0600
0700
0800 Sound & Printer Buffer
0900 RS423, Speech & Tape output Buffer
0A00 RS423 & Tape input Buffer
0B00 Function Keys
0C00 User defined graphics
0D00 NMI routines (Disk/Econet)
0D9F Expander vector set
0DF0 Paged ROM workspace storage locations
0E00 USER workspace / DFS workspace (not Master)
...
3000 Screen (Mode 0, 1, 2) USER workspace with shadow Mode 128…134
4000 Screen (Mode 3)
5800 Screen (Mode 4, 5)
6000 Screen (Mode 6)
7B00 Screen (Mode 7)
C000 OS ROM Paged rom workspace
DC00 MOS CLI Buffer
DD00 *MOVE workspace
DF00 MOS private workspace
E000 OS ROM
FC00 FRED 1MHz bus
FD00 JIM 1MHz bus
FE00 SHIELA I/O Memory
FF00 OS ROM Vectors
</syntaxhighlight>

Check out https://mdfs.net/Docs/Comp/BBC/AllMem for a complete memory map

=== Video display ===
The BBC Micro / Acorn Electron have the following native video modes:
* Standard text modes
* Bitmap modes
* Teletext / Mode 7 (BBC Micro only)

==== Sync with frame ====
<syntaxhighlight lang="6502">
-
</syntaxhighlight>

==== Plot in Bitmap modes ====
Here is a routine that will allow you to plot a single point in bitmap mode.
<syntaxhighlight lang="6502">
To be added
</syntaxhighlight>

==== Text mode ====
To be added
<syntaxhighlight lang="6502">
To be added
</syntaxhighlight>

=== Sound ===
To be added soon.

==== Make some noise ====
To be added soon.

=== Additional Resources ===
* Stardot forums https://stardot.org.uk/forums/