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( )Īlso the size of the 'int' type differs on the two systems.
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Windows is running on a little endian processor. What makes the project interesting is endianity problems. It takes files to be converted from the commandline, calls the conversion routine and saves the resulting. The tst2bmp.c file is the test environment. As I am developing on the Atari I do not have windows include files. These files will become the plug-in for IrfanView. The plug-in generates from the Atari ST input files a windows. As you might have read on this forum I am developing a plug-in for the windows picture viewer IrfanView ( to read Atari ST picture formats. This is done in C:Īs promised now something for reading and converting pictures.
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Before we can use trap #3 we have to install the trap handler. So in the copy_2plane() routine I go to user mode and at the end of the routine I go back to supervisor mode using a trap #3 call. You can use the user stack without problems. A7 is used as stack pointer and cannot be used either, or can it? On the 68000 A7 is used as stack pointer during interrupts, the processors stores the status register and the return address on the stack and the interrupt routines will save registers on the stack. That leaves 13 registers for data (8 data registers and 5 address registers). I need 3 address registers for source 1, source 2 and destination address. This means most of the OS doesn't know the screen adress has been changed, output of printf will go to the 'wrong' screen.Ĭode: Select all void copy_2plane(char* src1, char* src2, long dst) Ĭopy_2plane(buf+(i&0xf)*32000+bounce+((i&0xff0)>2),txt+j*80, (long)scr) Īs the copy_2plane() function is moving a lot of data I want to use as many registers as possible. Note I don't use xbios for doing screen change. With "*(char*)0xff8260UL=0 " the computer is forced into ST LOW (the old resolution is saved on the line before). With "scrp=(long)scr scrp+=(scrp&0xff00)>8" the address in converted into a long value that can be written to the videobase registers "*(long*)0xFF8200UL=scrp ". Because the screen has to start at a multible of 256 the screenbuffer is cast into a long, 256 is added and by doing a bitwise and with 0xffff00 we are sure the address is at an 256 byte boundary then the address is casted back into a pointer to char. The address of the new screen is calculated. First the old screen address is read and stored into old_scrp. *(long*) reads (or writes) the long at the given address. (long*) casts 0xff8200 into a pointer to a long. By reading the long at 0xff8200 you get them both in one read. 0xff8201 and 0xff8203 are the videobase registers. Reading and writing to some hardware registers. The linker will take the parts it needs.Ĭode: Select all old_scrp=*(long*)0xFF8200UL Please give me feedback on this.īg.c the C source, here is the function main, the first function that will be called after startupīgs.s the assembly, some high speed functions doing the hard work.Īll the libraries. In the time I have been coding I have added multiple startup modules so I am not 100% sure if this can be found in a normal Pure C distribution. The project will build bg.prj by compiling and linking the following modules:Į:\pc\lib\original\PCSTART.s startup code, I am not sure where this module is on a normal Pure C distribution. Code: Select all DEFAULT.PRJ for use with single module programsīg.prg name of executable program is topmost windowĮ:\pc\lib\original\PCSTART.s startup codeĪs the text says it is the default project file modified a little bit.