Difference between revisions of "Target"

From MSX Game Library

(→‎Basic program)
(→‎Mapped ROM program)
 
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<u>Note</u>: ''The maximum size of a BASIC program is about 24 KB (including variables).''
 
<u>Note</u>: ''The maximum size of a BASIC program is about 24 KB (including variables).''
  
−
The [[Build tool]] deployment step places your final program in two formats:
+
The [[Build tool]] deployment step places your final program in several formats:
 
* <tt>.bin</tt> format in <tt>emul/bin/</tt> folder
 
* <tt>.bin</tt> format in <tt>emul/bin/</tt> folder
−
* <tt>.dsk</tt> format in <tt>emul/dsk/</tt> folder (image of a disk containing your program)
+
* <tt>.dsk</tt> format in <tt>emul/dsk/</tt> folder (image of a floppy disk containing your program)
 +
* <tt>.cas</tt> format in <tt>emul/cas/</tt> folder (image of a tape cassette containing your program)
  
 
== MSX-DOS program ==
 
== MSX-DOS program ==
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|-
 
|-
 
| <tt>DOS2</tt> || MSX-DOS 2 program (starting at 0100h)
 
| <tt>DOS2</tt> || MSX-DOS 2 program (starting at 0100h)
 +
|-
 +
| <tt>DOS0</tt> || Direct program boot from disk (starting at 0100h)
 
|-
 
|-
 
| <tt>DOS</tt> || Alias for <tt>DOS1</tt>
 
| <tt>DOS</tt> || Alias for <tt>DOS1</tt>
−
|-
 
−
| <tt>DOS0</tt> || Direct program boot from disk (starting at 0100h)
 
 
|-
 
|-
 
| <tt>BOOT</tt> || Alias for <tt>DOS0</tt>
 
| <tt>BOOT</tt> || Alias for <tt>DOS0</tt>
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== Mapped ROM program ==
 
== Mapped ROM program ==
 +
{{IMG|raw.githubusercontent.com/aoineko-fr/MSXgl/main/engine/doc/img/target/rom_slot_ascii8_128.png|height:240px; margin:0.5em; float:right;|Example of slot and segment selection for a 128 KB ASCII-8 mapped ROM.}}
  
 
<u>Note</u>: ''"MegaROM" refers to a ROM of 128 KB or more. Even though they are not widely supported, there is nothing to prevent you from creating a 64 KB ROM using a mapper. We therefore prefer to use the term Mapped ROM here rather than MegaROM.''
 
<u>Note</u>: ''"MegaROM" refers to a ROM of 128 KB or more. Even though they are not widely supported, there is nothing to prevent you from creating a 64 KB ROM using a mapper. We therefore prefer to use the term Mapped ROM here rather than MegaROM.''
  
−
=== Setup ===
 
−
 
−
''128 KB ROM using an 8 KB mapper (ASCII-8) in slot 1. The ROM is composed of 16 segments, visible to the Z80 through 4 banks. In the example above, segment #0 is visible in bank #0, segment #1 in bank #1, segment #4 in bank #2 and segment #12 in bank #3.''</div>
 
 
You can create program using one of the ROM mappers supported by MSXgl:
 
You can create program using one of the ROM mappers supported by MSXgl:
 
{| class="wikitable"
 
{| class="wikitable"
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|-
 
|-
 
| <tt>ROM_KONAMI_SCC</tt> || Konami MegaROM SCC (aka Konami5): 8 KB segments for a total of 64 KB to 2 MB
 
| <tt>ROM_KONAMI_SCC</tt> || Konami MegaROM SCC (aka Konami5): 8 KB segments for a total of 64 KB to 2 MB
 +
|-
 +
| <tt>ROM_NEO8</tt> || [[NEO mapper]]: 8 KB segments for a total up to 32 MB
 +
|-
 +
| <tt>ROM_NEO16</tt> || [[NEO mapper]]: 16 KB segments for a total up to 64 MB
 
|}
 
|}
  
−
In your <tt>build.bat</tt>, chose as <tt>target</tt> one of the above target type.
+
In your <tt>project_config.js</tt>, chose as <tt>target</tt> one of the above target type.
 
You can specify the ROM size (in KB) in the <tt>ROMSize</tt> variable. Default value is 128 (KB).
 
You can specify the ROM size (in KB) in the <tt>ROMSize</tt> variable. Default value is 128 (KB).
−
Any multiple value of the mapper's segment size is valid, but I recommend using powers of 2 values (64, 128, 256, etc.) to help emulators to autodetect the right mapper.
+
Any multiple value of the mapper's segment size is valid, but we recommend using powers of 2 values (64, 128, 256, etc.) to help emulators to autodetect the right mapper.
  
 
Some [[Build Tool]] configuration examples:
 
Some [[Build Tool]] configuration examples:
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</syntaxhighlight>
 
</syntaxhighlight>
  
−
See <tt>[[Samples#VGM|projects/samples/s_vgm]]</tt> sample for a concrete use case.
+
For more detail:
 +
* [[Create a mapped ROM]] article.
 +
* <tt>[[Samples#VGM|projects/samples/s_vgm]]</tt> sample for a concrete use case.
  
 
The [[Build tool]] deployment step places your final program in <tt>emul/rom/</tt> folder.
 
The [[Build tool]] deployment step places your final program in <tt>emul/rom/</tt> folder.
−
 
−
=== Build ===
 
−
{{IMG|raw.githubusercontent.com/aoineko-fr/MSXgl/main/engine/doc/img/target/rom_slot_ascii8_128.png|height:240px; margin:0.5em; float:right;|Example of default slot selection for a 128 KB ASCII-8 mapped ROM.}}
 
−
Mapped-ROM use a system of sub-page (called "bank" here) the user can redirect to any segment of the ROM.
 
−
Those banks are mapped to page #1 and #2 (4000h~BFFFh) of the memory space.
 
−
The number of banks depends on the size of the mapper:
 
−
* 8 KB mappers have 4 banks:
 
−
** bank 0: 4000h~5FFFh
 
−
** bank 1: 6000h~7FFFh
 
−
** bank 2: 8000h~9FFFh
 
−
** bank 3: A000h~BFFFh
 
−
* 16 KB mappers have 2 banks:
 
−
** bank 0: 4000h~7FFFh
 
−
** bank 1: 8000h~BFFFh
 
−
 
−
The Build Tool build the first 32 KB of the mapped-ROM like a 32 KB plain ROM.
 
−
This represents the first 4 segments for a 8 KB mapper and the first 2 for a 16 KB mapper.
 
−
 
−
The following segments are added to the ROM by the Build Tool by searching for files with a particular nomenclature: <tt>''<project_name>''_s''<segment_number>''_b''<target_bank>''.c</tt>.
 
−
 
−
For example with a ASCII-8 ROM of 128 KB:
 
−
 
−
program.c          | Main program including segment #0~#3 (4*8 KB)
 
−
program_s4_b2.c    | Segment #4 to be used in bank #2 (8000h~9FFFh)
 
−
program_s5_b3.c    | Segment #5 to be used in bank #3 (A000h~BFFFh)
 
−
                    | No files found for segment #6 to #14: padding data added to the ROM
 
−
program_s15_b2.c  | Segment #15, the last one, to be used in bank #2 (8000h~9FFFh)
 
−
 
−
=== Segment selection ===
 
−
In your program, you can then select what segment is visible from what bank using the <tt>SET_BANK_SEGMENT(bank, seg)</tt> macro.
 
−
For example, to put segment 15 of the above example in bank 2, just use <tt>SET_BANK_SEGMENT(2, 15);</tt>
 
−
 
−
For information, at startup, the following segments are selected:
 
−
* 8 KB mappers:
 
−
** bank 0: segment 0
 
−
** bank 1: segment 1
 
−
** bank 2: segment 2
 
−
** bank 3: segment 3
 
−
* 16 KB mappers:
 
−
** bank 0: segment 0
 
−
** bank 1: segment 1
 
−
 
−
For more detail, see [[Create a mapped ROM]] article.
 
  
 
== Targets overview ==
 
== Targets overview ==
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| <tt>DOS0</tt> || RAM || RAM || RAM || RAM || Direct program boot from disk (starting at 0100h)
 
| <tt>DOS0</tt> || RAM || RAM || RAM || RAM || Direct program boot from disk (starting at 0100h)
 
|-
 
|-
−
| <tt>BIN</tt> || BIOS || BASIC || RAM || RAM || BASIC binary program (starting at 8000h)
+
| <tt>BIN_DISK</tt> || BIOS || BASIC || RAM || RAM || BASIC binary on disk (starting at 8000h)
 +
|-
 +
| <tt>BIN_TAPE</tt> || BIOS || BASIC || RAM || RAM || BASIC binary on tape (starting at 8000h)
 
|-
 
|-
 
| <tt>BIN_USR</tt> || BIOS || BASIC || RAM || RAM || BASIC USR binary driver (starting at C000h)
 
| <tt>BIN_USR</tt> || BIOS || BASIC || RAM || RAM || BASIC USR binary driver (starting at C000h)

Latest revision as of 22:40, 6 March 2024

The choice of the target determines the final format of the game: ROM, disk, etc.

It is a parameter used by the Build Tool to adapt your code to the target during the construction of the final program and to assemble the data to be compatible with the target.

The choice of the format is made in the project configuration file (project_config.js).

Here is a description of the different target formats available in MSXgl.

Basic program

Binary program to be executed from the BASIC environment using bload function.

Target Description
BIN_DISK BASIC binary program (starting at 8000h) on disk
BIN_TAPE BASIC binary program (starting at 8000h) on tape
BIN_USR BASIC USR binary driver (starting at C000h)
BIN Alias for BIN_DISK
BAS Alias for BIN_DISK

Note: The maximum size of a BASIC program is about 24 KB (including variables).

The Build tool deployment step places your final program in several formats:

  • .bin format in emul/bin/ folder
  • .dsk format in emul/dsk/ folder (image of a floppy disk containing your program)
  • .cas format in emul/cas/ folder (image of a tape cassette containing your program)

MSX-DOS program

Binary program to be executed from the MSX-DOS environment.

Target Description
DOS1 MSX-DOS 1 program (starting at 0100h)
DOS2 MSX-DOS 2 program (starting at 0100h)
DOS0 Direct program boot from disk (starting at 0100h)
DOS Alias for DOS1
BOOT Alias for DOS0

Note:

  • The maximum size of a MSX-DOS program is about 53 KB (including variables).
  • For "DOS0" target, maximum is 48 KB (excluding variables).

The Build tool deployment step places your final program in two formats:

  • .com format in emul/dosX/ folder (dos1, dos2 ou dos0)
  • .dsk format in emul/dsk/ folder (image of a disk containing your program)

Plain ROM program


Exemple of default slot selection for a 32 KB plain ROM.

Binary program to be written into a ROM from 8 to 64 KB and executed from a cartridge.

Target Description
ROM_8K 8 KB ROM in page 1 (4000h ~ 5FFFh)
ROM_8K_P2 8 KB ROM in page 2 (8000h ~ 9FFFh)
ROM_16K 16 KB ROM in page 1 (4000h ~ 7FFFh)
ROM_16K_P2 16 KB ROM in page 2 (8000h ~ BFFFh)
ROM_32K 32 KB ROM in page 1&2 (4000h ~ BFFFh)
ROM_48K 48 KB ROM in page 0-2 (0000h ~ BFFFh)
ROM_48K_ISR 48 KB ROM in page 0-2 (0000h ~ BFFFh) with ISR replacement
ROM_64K 64 KB ROM in page 0-3 (0000h ~ FFFFh)
ROM_64K_ISR 64 KB ROM in page 0-3 (0000h ~ FFFFh) with ISR replacement
ROM Alias for ROM_32K

See also: Create a plain ROM.

The Build tool deployment step places your final program in emul/rom/ folder.

Mapped ROM program


Example of slot and segment selection for a 128 KB ASCII-8 mapped ROM.

Note: "MegaROM" refers to a ROM of 128 KB or more. Even though they are not widely supported, there is nothing to prevent you from creating a 64 KB ROM using a mapper. We therefore prefer to use the term Mapped ROM here rather than MegaROM.

You can create program using one of the ROM mappers supported by MSXgl:

Target Description
ROM_ASCII8 ASCII-8: 8 KB segments for a total of 64 KB to 2 MB
ROM_ASCII16 ASCII-16: 16 KB segments for a total of 64 KB to 4 MB
ROM_KONAMI Konami MegaROM (aka Konami4): 8 KB segments for a total of 64 KB to 2 MB
ROM_KONAMI_SCC Konami MegaROM SCC (aka Konami5): 8 KB segments for a total of 64 KB to 2 MB
ROM_NEO8 NEO mapper: 8 KB segments for a total up to 32 MB
ROM_NEO16 NEO mapper: 16 KB segments for a total up to 64 MB

In your project_config.js, chose as target one of the above target type. You can specify the ROM size (in KB) in the ROMSize variable. Default value is 128 (KB). Any multiple value of the mapper's segment size is valid, but we recommend using powers of 2 values (64, 128, 256, etc.) to help emulators to autodetect the right mapper.

Some Build Tool configuration examples: 

//-- 128 KB ASCII-8 mapped-ROM
target = "ROM_ASCII8";
//-- 4 MB ASCII-16 mapped-ROM
target = "ROM_ASCII16";
ROMSize = 4096;
//-- 512 KB Konami SCC mapped-ROM
target = "ROM_KONAMI_SCC";
ROMSize = 512;

For more detail:

The Build tool deployment step places your final program in emul/rom/ folder.

Targets overview

Target Selected at boot Description
P0 P1 P2 P3
ROM_8K BIOS Cart RAM RAM 8 KB ROM in page 1 (4000h ~ 5FFFh)
ROM_8K_P2 BIOS RAM Cart RAM 8 KB ROM in page 2 (8000h ~ 9FFFh)
ROM_16K BIOS Cart RAM RAM 16 KB ROM in page 1 (4000h ~ 7FFFh)
ROM_16K_P2 BIOS RAM Cart RAM 16 KB ROM in page 2 (8000h ~ BFFFh)
ROM_32K BIOS Cart Cart RAM 32 KB ROM in page 1&2 (4000h ~ BFFFh)
ROM_48K BIOS Cart Cart RAM 48 KB ROM in page 0-2 (0000h ~ BFFFh)
ROM_48K_ISR Cart Cart Cart RAM 48 KB ROM in page 0-2 (0000h ~ BFFFh) with ISR replacement
ROM_64K BIOS Cart Cart RAM 64 KB ROM in page 0-3 (0000h ~ FFFFh)
ROM_64K_ISR Cart Cart Cart RAM 64 KB ROM in page 0-3 (0000h ~ FFFFh) with ISR replacement
ROM_ASCII8 BIOS Cart Cart RAM ASCII-8: 8KB segments for a total of 64 KB to 2 MB
ROM_ASCII16 BIOS Cart Cart RAM ASCII-16: 16KB segments for a total of 64 KB to 4 MB
ROM_KONAMI BIOS Cart Cart RAM Konami MegaROM (aka Konami4): 8 KB segments for a total of 64 KB to 2 MB
ROM_KONAMI_SCC BIOS Cart Cart RAM Konami MegaROM SCC (aka Konami5): 8 KB segments for a total of 64 KB to 2 MB
DOS1 RAM RAM RAM RAM MSX-DOS 1 program (starting at 0100h)
DOS2 RAM RAM RAM RAM MSX-DOS 2 program (starting at 0100h)
DOS0 RAM RAM RAM RAM Direct program boot from disk (starting at 0100h)
BIN_DISK BIOS BASIC RAM RAM BASIC binary on disk (starting at 8000h)
BIN_TAPE BIOS BASIC RAM RAM BASIC binary on tape (starting at 8000h)
BIN_USR BIOS BASIC RAM RAM BASIC USR binary driver (starting at C000h)

Main

For ROM or Basic program, the main function prototype is: 

void main();

For DOS1 target, this prototype can also be used to get command-line arguments (set DOSParseArg to allow arguments parsing): 

void main(u8 argc, const c8** argv);

For DOS2 target, this prototype can also be used to return a value du MSX-DOS: 

u8 main();
u8 main(u8 argc, const c8** argv);
  • argc: Integer that contains the number of arguments present in argv. The argc parameter can be 0 if no parameter have been added to the command line.
  • argv: Array of null-terminated strings representing command-line arguments entered by the user of the program.
  • return: The return value can be catch by MSX-DOS 2 as an error code to know if program process succeeded or not.
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