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Damn, I miss the days Turbo Pascal was used for business logic, and the grunt work was TASM blocks and syscalls.

Actually, that might just be the nostalgia talking.

int 0x80 was/is the x86_32 way of doing syscalls in linux.

im not sure if sysenter, used on 64bit systems is classed as an interrupt.

the sdk is just a layer on top of that.

ive never used c on dos, it woukdnt surprise me if they used a similar library to linux. theres certainly nothing preventing it.

MS-DOS used Int 21h with the function number in in the AH register.

Ah, I still remember those DOS interrupts :)

And of course, modern Pascal compiler like FPC provides OS specific units to do that.