Computers and Technology
History of the Computer - Machine Code Programs Part 2 of 3
What components will we be using? We have mentioned Registers as being where data being worked on is stored. One of these is the Program or P register. Read more →History of the Computer - Machine Code Programs Part 3 of 3
Now let's look at the program again.(0)000 - 000 011 000 STORE (1)001 - 000 100 001 STORE (2)010 - 001 000 010 ADD (3)011 - 010 001 001 SUBTRACT (4)100 - 011 001 010 BRANCH (5)101 - 100 000 000 STOPWe start with the instruction in location 000. Read more →History of the Computer - Mass Storage Part 1 of 3
We have mentioned mass storage in passing previously, in the history of the computer series. The term mass storage is applied to a group of media, including drums magnetic tape and disks. Read more →History of the Computer - Mass Storage Part 2 of 3
MAGNETIC DISK STORAGEMagnetic disks used a similar recording system to the drums, but arranged on magnetic coated platters, made of aluminum, approximately 1ft in diameter. Read more →History of the Computer - Mass Storage Part 3 of 3
MAGNETIC TAPE STORAGE Beginning in the 1950s, magnetic tape has progressed from the original half inch wide ferrite coated tape on open reels 10inch diameter and 2400ft long to the current cassettes mounted on drives in stacks. Read more →History of the Computer - Memory Error Correction Codes Part 1 of 2
We have mentioned before, in the history of the computer series, that various forms of error correction are used, in cases where the medium is unreliable. Read more →History of the Computer - Memory Error Correction Codes Part 2 of 2
32 bit or 64 bit words are common, but for illustration purposes, we will use our 7 bit word from the example above, without the parity bit. We need to calculate the extra parity bits to write into memory along with the data bits, at the appropriate bit positions. Read more →History Of The Computer - Redundancy Part 1 Of 2
We have mentioned previously, in history of the computer, that mainframes are large scale devices. We have also mentioned various forms of error correction. Read more →History of the Computer - Redundancy Part 2 of 2
Can you see what's coming next? What happens if the controller fails? Ha! - we're ready for that! We put in another controller, and connect the second string of cables to this one instead! Read more →History of the Computer - the Bootstrap
In previous articles in the History of the Computer series we discussed machine codes, programs, and memories. We also mentioned that many types of memory are volatile, that is, if we remove power, the memory loses it's data. Read more →← Previous Next →
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Aphorism
There are three roads to ruin; women, gambling and technicians. The most pleasant is with women, the quickest is with gambling, but the surest is with technicians.