It had a Zilog Z-80 processor. With 1K of memory for the screen (character display) and another 1K for use by programs.
There was no room for a compiler or an assembler. So to create a program, you entered opcodes into the memory as hexadecimal numbers.
So, for example, if your program started with loading the A register with the number 3. - You might think of this as the assembly instruction:
LD A,3
But then you would need to look-up the opcode in a book (or memorise it). And type in
3E 03
I wrote a few programs on it. A version of Game of Life - And a simple side-scrolling shooter. (where the graphics were various alphabetic characters).
There was no bin file, or files of any kind, because there was no operating system to interpret such a file. There was the ability to dump a block of memory directly to a tape. And this is how programs were saved and loaded.

int i = 0;
while (arr[i] != '\0') {
    i++;
}
return i;

#define RET_OK 0
#define RET_NOK 1

int add (int a, int b) {
    return a + b;
}

int main() {
    int s = 43;

    int (*func_ptr)(int, int) = add;
    int res = func_ptr(s, ++s);
    printf("%i\n", res);
    return RET_OK;
}

اگر میخواستم یه pointer to function داشته باشم که int برگردونه و از ورودی یدونه float و یدونه char بگیره باید چجوری مینوشتم ؟ این زیر کامنت کنید.

از این به بعد کوئیز های پیشرفته تر هم گذاشته میشه جلو جلو نسبت به مباحث،
که اونایی که بلدن بتونن بیشتر ارتباط بگیرن باهاشون،

اونایی که بلد نیستن هم توجهی بهشون نکنن،
همشون رو میگیم تو ویدیو ها.