There are a lot of possibility how to mov 0 in to ax under IA32… lea eax, [0] mov eax, 0FFFF0000h //All constants form 0..0FFFFh << 16 shr ax, 16 //All constants form 16..31 shl eax, 16 //All constants form 16..31 And perhaps the most strange… 🙂 @movzx: movzx eax, byte ptr[@movzx + 6] //Because … Read more
NASM/YASM is easy to distinguish from MASM/TASM/emu8086. YASM uses NASM syntax, with a few minor differences in what it accepts for constants and directives. I don’t know how to distinguish MASM from TASM, or TASM from emu8086, or FASM, so I’ll leave that for another answer to address. In NASM, explicit sizes on things like … Read more
For example my buffer contains: 456 I need that the output looked like 456*3 which equals to 1368 In contrast to your current approach that starts at the end of the source string, combining the digits into a 16-bit integer ready for multiplication, is best done beginning at the start of the sequence of digits: … Read more
Your input digits are ASCII characters, so ‘1’ is actually 31h, for example. So when you calculate 1+1 your are getting 31h+31h=62h which is the ASCII character ‘b’. To convert your input digits to their equivalent integer values you need to subtract ‘0’ (30h). Conversely to output integer digits as ASCII characters you will need … Read more
You need to write/use image loader or use your own image file format. BMP may look simple but has too much in it like compression pixel formats etc but you still can focus on a specific type of BMP and ignore all the others… Back in the days of MS-DOS I was using 256 color … Read more