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Mad Pascal Compiler for 6502 (Atari XE/XL, C64, C4Plus, Neo6502)

Mad-Pascal

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Introduction

Mad-Pascal (MP) is a 32-bit Turbo Pascal compiler for Atari XE/XL. By design, it is compatible with the Free Pascal Compilator (FPC) (the -MDelphi switch should be active), which means the possibility of obtaining executable code for XE/XL, PC and every other platform for which FPC exists.

MP is not a port of FPC; it has been written based on of SUB-Pascal (2009), XD-Pascal (2010), the author of which is Vasiliy Tereshkov.

A program that works on Atari might have problems on PC if, for example, the pointers have not been initialized with the address of a variable and the program attempts to write to the address $0000 (memory protection fault).

The strengths of MP include fast and convenient possibility of inclusion of inline assembly. A program using inline ASM does not work on platforms other than 6502 CPU. MP uses 64KB of primary memory; TMemoryStream provides usage of extended memory.

Variable allocation is static; there is no dynamic memory management. Parameters are passed to functions by value, variable or constant.

The available features are:

  • If Case For To For In While Repeat statements
  • Compound statements
  • Label Goto statements
  • Arithmetic and boolean operators
  • Procedures and functions with up to 8 parameters. Returned value of a function is assigned to a predefined RESULT variable
  • Static local variables
  • Primitive data types, all types except the ShortReal, Real type are compatible. Pointers are dereferenced as pointers to Word:
    • Cardinal Word Byte Boolean
    • Integer SmallInt ShortInt
    • Char String PChar
    • Pointer File Text
    • ShortReal Real fixed-point
    • Float16
    • Single / Float
  • One-dimensional and Two-dimensional arrays (with zero lower bound) of any primitive type. Arrays are treated as pointers to their origins (like in C) and can be passed to subroutines as parameters
  • Predefined type String [N] which is equivalent to array [0..N] of Char
  • Type aliases
  • Records
  • Objects
  • Separate program modules
  • Recursion

Compile

fpc -MDelphi -vh -O3 mp.pas

Usage

WUDSN + Mad Pascal

Mad Pascal i Geany

Atari XE/XL

mp.exe filename.pas -ipath:<MadPascalPath>\lib
mads.exe filename.a65 -x -i:<MadPascalPath>\base

BAT

    <MadPascalPath>\MP.exe %1 -ipath:<MadPascalPath>\lib -ipath:<MadPascalPath>\blibs

    if exist %~dp1%~n1.a65 (
	    mads.exe "%~dp1%~n1.a65" -xli:<MadPascalPath>\base
	    if exist "%~dp1%~n1.obx" altirra "%~dp1%~n1.obx"
    )

Commodore 64

mp.exe -t c64 filename.pas -ipath:<MadPascalPath>\lib
mads.exe filename.a65 -x -i:<MadPascalPath>\base

Commodore Plus/4

mp.exe -t c4p filename.pas -ipath:<MadPascalPath>\lib
mads.exe filename.a65 -x -i:<MadPascalPath>\base

Neo6502

mp.exe -t neo filename.pas -ipath:<MadPascalPath>\lib
mads.exe filename.a65 -x -i:<MadPascalPath>\base

RAW

mp.exe -t raw filename.pas -ipath:<MadPascalPath>\lib
mads.exe filename.a65 -x -i:<MadPascalPath>\base

Tools

MadStrap

Simple Atari Mad-Pascal common project bootstrap.

Source code at GitLab

BLIBS

Set of custom libraries for MadPascal.

Lastest documentation always at GitLab

pasdoc

Custom tool for generating documentation from pascal comments in units.

Source code at GitLab

Effectus - Action! compiler

In new version the source code is generated by using Mad Pascal cross-compiler, which is further compiled to binary code with Mad Assembler.

Game tutorial

Simple game tutorial by using Mad Pascal

FiDL

Display List program editor for 8-bit Atari ANTIC chipset

CutAs

Simple binary data manipulation tool written in javascript (export to Action!, Assembler, C, Pascal)

Bocianu's Atari Toolkit HUB

CutAs, FiDL, SprED, Sprite XL

A8 Mad-Pascal Window Library

This is a text mode windowing library complete with window controls and modern gadgets (widgets). The gadgets allow you to build input forms that use buttons, radio buttons, input strings (with scrolled lengths and type restrictions), check boxes, progress bars, etc. This allows you to build applications with "modern"-ish interfaces.

Projects in Mad-Pascal

Benchmarks

CC65 Mad Pascal Millfork
Sieve (less is better) 602 577 579
YoshPlus (higher is better) 41933 41933 41933
Chessboard (higher is better) 76 88 82

https://github.com/tebe6502/Mad-Pascal/blob/master/samples/benchmark.7z

Floating Point

iteration x 256 Atari OS FastChip MP Single MP Real
add, sub, mul, div 232 118 64 99
add, sub, mul, div, sin, cos 5820 2915 3728 1231
  • MP Single: IEEE754-32bit
  • MP Real: Q24.8 Fixed Point

https://github.com/tebe6502/Mad-Pascal/blob/master/samples/fp_benchmark.7z

Suite

suite-animation

sources

Links

YouTube

Pascal compilers for the Atari XE/XL computer

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Mad Pascal Compiler for 6502 (Atari XE/XL, C64, C4Plus, Neo6502)

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