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.

Sources are on GitHub with release for Windows operating system.



  • rewritten handling of CASE OF
  • rewritten code optimization for arrays not exceeding 256 bytes
  • optimization for conditions '>', '<='
  • added memory allocation for STRING-type arrays (so far only the pointer was put away, it worked like 'array of ^string')
  • new platform added, Commodore C4 Plus
  • unit GRAPHICS: procedure Font(charset: pointer);
  • unit MISC, RMT, CMC, MPT: DetectAntic
  • unit SYSTEM revised to include ATARI, C64, C4Plus platforms
  • unit ZX0
  • unit HCM2
  • added support of $resource (RCDATA, RCASM) for C64, C4Plus platforms, resources are sorted by ascending addresses
  • extended RCDATA resource with possibility to specify ofset for read file
  • added support for Pascal compliant syntax for ASM block, no { } brackets required
  • added new directive {$codealign proc = value}, {$codealign loop = value} allowing to align generated code


  • multiplying procedures u8x8, u16x16 replaced by code from CC65
  • adding the POKEY reset code at the beginning of the program launch
  • optimization of conditional IF expressions () and () and ... IF () or () or ...
  • GRAPH, FASTGRAPH: SetActiveBuffer, SetDisplayBuffer, NewDisplayBuffer, SwitchDisplayBuffer, example demoeffects\lines2.pas, line3.pas, line4.pas
  • GRAPH: Ellipse procedure (X, Y, StAngle, EndAngle, xRadius,yRadius: Word);
  • MATH: Hypot
  • SYSTEM: Length(string_array[element])
  • SYSTEM: GetMem, FreeMem
  • SYSUTILS: corrected FindFirst, StrToFloat
  • SYSTEM: corrected Val(string, real, code) ; Val(string, single, code)
  • new CIO unit: Opn, Cls, Get, Put, BGet, BPut, XIO
  • new SIODISK unit, separated from the SYSTEM
  • new S2 unit, integrated with handler installer VBXE-S2: (S_VBXE.SYS)
  • new DEFLATE unit, which performs DEFLATE decompression (procedure unDEF), example compression\undef.pas
  • new LZ4 unit, implementing LZ4 decompression (procedure unLZ4), example compression\unlz4.pas, unlz4_stream.pas
  • new APLIB unit, which performs apLib decompression (procedure unApl), example compression\unapl.pas, unapl_stream.pas
  • new CRC unit: function crc32(crc: cardinal; buf: Pbyte; len: word)
  • a new PASCAL procedure/function modifier, causing a new memory block to be assigned/released for variables each time a procedure/function is called, example 'math\evaluate.pas'.
  • added ability to disable ROM while maintaining system operation, {$DEFINE ROMOFF}
  • shorter names of the switch -zpage (-z), -stack (-s), -data (-d), -code (-c), -define (-d), -ipath (-i)
  • added possibility to generate code for C64 (-t c64)