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  1. strettonman

    Mathimatical Problem

    If you are using an Intel 80x86 processor, at least from the 486 onwards, you should be able to find some floating point instructions which will let you store a decimal square root to memory, and then read it back as a (rounded down) integer square root.
  2. strettonman

    Mathimatical Problem

    I'm not sure it makes sense mathematically either. To paraphrase: There is a number(int), 7 say, and i want to find the number(int) wich when you square it you will get either the number 7 or the int before it (i.e. 6 ). Well neither 6 or 7 have integer square roots.
  3. strettonman

    trap vector versus branching

    A trap is an interrupt which occurs as a result of some action taken by the program - such as setting the single step flag, executing an INTO instruction, or issuing a break point interrupt. Unless you are doing something relatively specialised, such as writing a degugger, you seldom if ever...
  4. strettonman

    Help with file I/O

    At a quick glance I can't see any files being closed, which is not an optional extra if you want stuff flushed to disk.
  5. strettonman

    How can I delay smth on screen?

    If you use int 10H in a TSR program there is a good chance it will crash. There are very few interrupts which can be called from within a TSR without taking elaborate precautions, and int 10H isn't one of them. The best thing to do would be to write directly to video buffer at 0B800:0000. With...
  6. strettonman

    Encryption of characters entered into a buffer

    Maybe the xor is leaving you without a printable character
  7. strettonman

    Suitable Assembly Learning Material/Book, Recommendations?

    Whenever I look at assembly language programs, on this and other sites, they are always full of MS-DOS style programs. Part of the reason is that, if you want to cover every part of assembly language, you have got to use DOS type programs, otherwise Windows will get in your way.
  8. strettonman

    opengl compile error

    It could be that way, because it doesn't say #ifndef wchar_t typedef unsigned short wchar_t; #define _WCHAR_T_DEFINED #endif Try commenting out the offending line and see if the problem goes away. If it does you have your answer.
  9. strettonman

    convert simple assembly into C

    Intel x86 assembly language is as future proof as could be wished for. A program written in 1981 for the very first PC could, in theory, be run on the very latest PC. Provided you installed MS-DOS first of course, or alternatively (like me) have it already installed on a spare partition for old...
  10. strettonman

    convert simple assembly into C

    The registers obviously need replacing with variables ================================ >>= and <<= in place of shr and shl ================================== mov ebx, [start_neg_pow2] add ax, word ptr [ebx + ecx * 2 ] replacing start_neg_pow2 with p, the above becomes something like: add...
  11. strettonman

    How many ways to get into an endless loop?

    L1: jmp L1 preferably preceded by cli
  12. strettonman

    opengl compile error

    Open glut.h, go to line 50, and see what you find there. Apparently a short integer, which has already been declared somewhere or other, is being declared again.
  13. strettonman

    need help with segment addressing

    Have you heard of the Global Descriptor Table? In protected mode the segment registers do not contain an address you can do calculations on. Instead they contain an index into the GDT. The GDT contains details of all currently allocated memory, and the particular piece of information you would...
  14. strettonman

    how do I write a text input driver on my x86 console OS

    If you are writing a console OS, the buffer will always be at B800:0000. For the life of me I can't see the point of not using the BIOS interrupts; MS-DOS certainly does, and that's what they are there for. I wouldn't envy anybody the job of trying to program a floppy disk controller directly...

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