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The Question & Answer (Q&A) Knowledge Managenet

The Internet has many places to ask questions about anything imaginable and find past answers on almost everything.

Table of Contents

- How much memory can an 8 bit processor address?
- How many memory locations can be addressed in a computer system with an 8 bit data bus and a 16 bit address bus?
- How many memory locations can a processor address?
- What is the address bit for an 8 bit microprocessor?
- Is Minecraft considered 8 bit?
- Which is a 8 bit microprocessor?
- Is binary always 8 bit?
- What is the decimal number for 1000 0000 in binary?
- What is the largest value that can be represented with 6 bits?
- What is a 6 bit value?
- Can be represented as a 6 bit number?
- What is an 8 bit number?
- Why is sign and magnitude not used?
- What is in 8 bit two’s complement representation?
- What is 2’s complement with example?
- Why is two’s complement used?

8-bit CPUs use an 8-bit data bus and can therefore access 8 bits of data in a single machine instruction. The address bus is typically a double octet (16 bits) wide, due to practical and economical considerations. This implies a direct address space of 64 KB (65,536 bytes) on most 8-bit processors.

An 8-bit addressable unit combined with 16-bit address bus amounts to 64KiB of RAM that the CPU can address. Also what does 8 bit words mean? In context, the word size goes with the address size to describe the memory bus. There are 16 bits gling out to the memory so it can choose 64ki locations.

Directly, a CPU with only an 8-bit address bus can only directly address 256 bytes of memory directly, though as Lawrence Stewart points out in his answer, a CPU will rarely be the only determining factor of how much memory there is in the computer.

In computer architecture, 8-bit integers, memory addresses, or other data units are those that are 8 bits (1 octet or 1 Byte) wide. Also, 8-bit CPU and ALU architectures are those that are based on registers, address buses, or data buses of that size.

Minecraft is not 8-bit, it is simply designed to graphically use the art style of old 8-bit games. Depending on the version of the game Minecraft is either 32-bit or 64-bit.

The Intel 8085 (“eighty-eighty-five”) is an 8-bit microprocessor produced by Intel and introduced in March 1976.

In the electronics world, each binary digit is commonly referred to as a bit. A group of eight bits is called a byte and four bits is called a nibble….Binary Numbers.

Decimal, Base 10 | Hexadecimal, Base 16 |
---|---|

15 | F |

16 | 10 |

17 | 11 |

And so on … |

Latest signed binary numbers converted to signed integers in decimal system (base ten)

1000 0000 = -0 | Jul 09 02:43 UTC (GMT) |
---|---|

1000 0101 0000 0111 1111 1111 1111 1101 = -84,410,365 | Jul 09 02:41 UTC (GMT) |

1111 1111 1100 0000 0000 0000 0000 0110 = -2,143,289,350 | Jul 09 02:41 UTC (GMT) |

Binary number representation

Length of bit string (b) | Number of possible values (N) |
---|---|

5 | 32 |

6 | 64 |

7 | 128 |

8 | 256 |

A six-bit character code is a character encoding designed for use on computers with word lengths a multiple of 6. Six bits can only encode 64 distinct characters, so these codes generally include only the upper-case letters, the numerals, some punctuation characters, and sometimes control characters.

Of course, it is 64 integers. If you are representing only positive integers then you can represent 0 to 63. If you are representing negative numbers also, then you must use 2’s complement representation because it is the best and it is the standard format used in computers.

8 bits, can represent positive numbers from 0 to 255. hexadecimal. A representation of 4 bits by a single digit 0..

ADVANTAGE of signed magnitude: You can determine whether a number is negative or non negative simply by testing the most significant bit. DISADVANTAGES of signed magnitude: One of the bit patterns is wasted. Addition doesn’t work the way we want it to.

Two’s complement representation, or, in other words, signed notation – the first bit tells about the sign. The convention is that a number with a leading 1 is negative, while a leading 0 denotes a positive value. In an 8-bit representation, we can write any number from -128 to 127.

To get 2’s complement of binary number is 1’s complement of given number plus 1 to the least significant bit (LSB). For example 2’s complement of binary number 10010 is (01101) + 1 = 01110….2’s Complement of a Binary Number.

Binary number | 1’s complement | 2’s complement |
---|---|---|

100 | 011 | 100 |

101 | 010 | 011 |

110 | 001 | 010 |

111 | 000 | 001 |

Two’s complement allows negative and positive numbers to be added together without any special logic. The same is true for subtraction. This means that subtraction and addition of both positive and negative numbers can all be done by the same circuit in the cpu.