2022年11月25日 · Does this answer your question (the linked question is about MASM not NASM but they support similar syntax for hex constants)? How do I write letter-initiated hexadecimal numbers in masm code?

2016年12月25日 · Note The address range 0F0000h - 0FFFFFh is read only. The true story is that it is set read-only by the firmware upon startup after the shadow copy of the BIOS has been made, so that an access doesn't have to go all the way down to the PCH, that by default reroute it at the standard address range FFFF_0000H - FFFF_FFFFH. So those address range is either mapped to a read-only DRAM area or to a ...

2022年5月27日 · mov ax, 0ffffh inc ax inc ax Was watching a video on basic Intel X86 Assembly. I thought 0FFFFH was 65535 but in the video they got -1 instead (before the inc instructions run). Just wondering ho...

2013年7月26日 · My book says the hexadecimal notation FFFF equals 65535 in decimal value. As I understand it that equals to 2^16. There are a couple of things I still don't fully understand. 1) Is FFFF a mix of b...

2017年8月11日 · In the book "The Intel Microprocessors" by Barry B. Brey, I have seen that if the segment address is FFFFH, A20 pin is enabled while adding offset to the segment address. But to take the full advantage of the "high memory", any segment address in the range F001H to FFFFH (value stored in the segment register) should do the same.

2013年1月1日 · A central memory composed by two memory module (RAM).the total address range attributed to the central memory is: FROM 0000 0000H TO 3FFF FFFFH 1/Give the total capacity of the central memory (Megabyte and Gegabyte)

From the book, Art of Assembly, I copy this quote: In the two’s complement system, the H.O. bit of a number is a sign bit. If the H.O. bit is zero, the number is positive; if the H.O. bit is one, ...

2016年10月9日 · FFFFh qualifies, because if you were to add one, it would make the rightmost F into a 0, and the one would carry to the next, etc. Your answer would be 10000h, which does not fit into 16 bits, leaving your 16 bits as 0000h.

2017年3月15日 · ax will store upto ffffh that is if you add two number in ax which will give result greater than ffffh (65535 in decimal number) then carry will contains the msb digit. ex: mov ax,1234 add ax,2345 ;then ax will have 1234+2345 = 3579 but if mov ax,fffeh add ax,03h ;then ax will have 0001 and carry flag will contain 1.

In your example for Range 1, you are correct. That is the size of the memory, stated in hexidecimal, in bytes. You may gain the most insight by first converting 00FF FFFF to a decimal number, then converting that number of bytes into megabytes. To convert from bytes to megabytes use the relationship 1 MB = 1 Megabyte = 1024 * 1 KB = 1,048,576 bytes. There are tons of online Hex to Decimal ...