Originally consisted of a 'Mega Capsule' only for use with the later version of the OPD bound for the U.S.A. The 'Mega Capsule' employs memory paging techniques that are Incompatible with a standard OPD. However, the program has been copied to 4 x 32k Eproms and can be inserted into a standard 2 slot Rompack. The compiler was written by Tony Cheal of Computer One in Cambridge solely to compile a Basic program for a telesales company in the U.S. . No info is available on wether the program ever ran. The package consists of: MC Basic Compiler 68008 Assembler Editor The menu also lists a linker, but it has been confirmed that this section was never completed. The compiler has been successfully tested and a number of programs compiled to check the various Functions. The program produced carries a large overhead of library sub-routines making small applications uneconomic in terms of memory. Once past the 'threshold', however, larger programs are most suitable. Should a suite of programs be running together, it is necessary only to load the library once. An option exists at compiler run time to exclude the library. Some attempts at assembly of 68008 code have failed, but it is thought further testing is required. No documentation is available exclusive to the OPD. Although officially required to compile MC Basic, many of the features of ICL Basic for the OPD, itself a version of Sinclairs SuperBasic, are included in tandem. This gives access to the superior features such as user defined Procedures instead of position dependant GOTO and GOSUB The compiler also has the ability to compile Basic lines that MCBasic rejects. e.g. The command line(x,y)-(a,b) is rejected by MCBasic but compiles O.K. This command is the only way to draw a line available to the OPD user. ( Graphics commands do not exist in OPD/ICL Basic.) As there is little info on what is acceptable to the compiler and its' syntax, it is taking some time to access by trial and error. The compiler writes a run-time library for each program that takes up about 39blocks (20k). Small programs will therefore occupy relatively more space. Medium to large programs will save space due to the re-using of library routines. The main advantages of the compilation of the program is in speed of execution, memory usage (no need to load Basic),and the ability to choose the program from the Applications menu. During testing the 'PROGRAM TOO LARGE' error message was encounted. It is not known at this time wether this is a limitation of the compiler or of the memory available in the machine. Some documentation is available but no 'official' handbook was written.