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Questions tagged [8-bit]

In computer architecture, 8-bit integers, memory addresses, or other data units are those that are at most 8 bits (1 octet) wide. Also, 8-bit CPU and ALU architectures are those that are based on registers, address buses, or data buses of that size. 8-bit is also a term given to a generation of computers in which 8-bit processors are the norm.

An 8-bit number has 2^8 = 256 possible states, 8 bits is one which is why computers with this architecture use bytes as a measurement of storage, for example you can have 64 gigabytes or 64000000000 bytes of memory (RAM).

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Can I buy a single MAC address for a computer project?

So, I'm currently building an 8-Bit computer, and working on getting it connected to the internet, clearly just on a simple LAN to start off, in the hope of making ARP requests and such like which would be pretty cool. I have had a little look…
Rhys Garman
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Java program to calculate 8-bit checksum

I have an assignment to calculate the checksum of a number of 8-bit binary numbers. I've come a long way but for some reason it's giving me the wrong result. For example if x is: 10101010 and y is: 01101111, the checksum would be 11100110. But my…
Andreas Nielsen
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Issue with an 8-bit ALU: the program won't stop and I need to verify that the specifications are reached

I have a big issue with an 8-bit ALU. To begin with, the code won't stop running. Second, a chart of specifications was given, and I believe I'm missing some of them Here are the specifications: Specification Data Inputs: A (8-bit), B…
GHG HGH
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How to differentiate +128 from -128 in an 8-bit memory location in binary representation when their representation is the same?

In an 8-bit memory location, the integer +128 is 10000000 but also using two's complement method -128 integer is represented as 10000000. I find this weird. Why is +128 or 128(unsigned) represented as 10000000? The leftmost bit is 1, and this means…
user134613
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Read binary data as three UBYTE (8-bit Unsigned Byte) in MATLAB and use bit shift operators to get two 12 bit streams

I need to read the data as UBYTE (8-bit Unsigned Byte) in MATLAB and then used bit shift operators to get two 12-bit streams with 3600000 samples. I have to do that by a command that the first two 12 bit values are contained in the first 3 UBYTEs,…
Eliza Telior
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Does SMTP transfer 7bit or 8bit characters (clear MSB or not?)

My understanding is that the original SMTP protocol was defined to limit transmission of characters using only 7 bits to save of transmission costs. This protocol is almost 40 years old, and since then multiple RFCs have extended the standards. For…
Cyril Graze
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Why is an AES encrypted string saving as blank to MySQL table with Ruby?

I have a model called Encryption which generates an AES encrypted string and saves that to a database table called encryptions. My encryption table schema is as follows: id : bigint unsigned user_id : bigint unsigned encryption : VARCHAR(128)…
Chad Johnson
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How do you compare one number to another to see if it is greater or less in assembly

So I am using a very strange CPU. It does not use bitwise operators and instead uses addition, subtraction, multiplication, division and modulo. It is 8 Bit and uses 5 registers, the accumulator and the X, Y, Z and PC registers. Here is the…
justAnotherCoder
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How to limit the result of binary conversion to a maximum of 8-bits (255)?

How can I limit the resuly to only 8 bits? I have to add two binary numbers and convert the result to decimal. How to limit the sum to only 8 bits or 255? def BinaryToDecimal(binaryNum): binaryList = [] decimalNumber = 0 while binaryNum…
Sank2058
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FFMPEG Transcode H265 video from 10-bit to 8-bit

I'm trying to convert my library from various formats into HEVC 8-bit mainly to shrink my library down. This is generally working but I've run into an issue when trying to convert an existing file from 10-bit H.265 to 8-bit H.265. My processor, an…
Zach
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VHDL Adding and two 8 bits registers in Simple 8bit Processor

I need to create a simple 8-bit processor that will add and subtract two registers. The result of addition and subtraction must be saved in register A. Data in registers A and B should be entered using the D_IN input. Then I send register A to the…
Boniek
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Why is the bpp information at 0x1C in this .bmp image wrong?

Address 1D indicates the image is eight bits per pixel, but it isn't, each pixel is represented by 3 bytes (24 bits). At first, I thought photoshop did this in error, but I found that this format was used for all greyscale images. Instead of using…
superlazyname
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Why is the bitmap we are generating, from a single black pixel, 1KB?

Using C# and Visual Studios I am trying to find any documentation on how 8-bit greyscale images are encoded but no amount of research has resulted in any information. When we convert a bmp file (created with a forced depth of 8-bit), of a single…
Logan Dennison
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Fast 8bit multiplier in assembly

I have MCU in Logisim and following asm code. It is working but I have to improve it - make it faster. How to do that? I understand that it depends on data input. My ideas - arrange input operands. For example 2*5=5+5 and the same 5*2=2+2+2+2+2 so I…
Eifel
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Why is this array pointer shifted by 1?

I am studying for an exam in microprocessors and this example question has come up: In summary of it, there is an array in program memory after the code: array: .db 11,12,13,14,15,16,17,18,19,20 and in the code the pointer is loaded as: ldi ZL,…
nickhansenrf
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