by herbzins
2. May 2014 02:47
Z-paper-1299 by Herb Zinser
Images for Computer EARTH super-symmetry ... ibm 3380 disk tracks
www-03.ibm.com/ibm/history/exhibits/storage/storage_3380b.html
The double capacity models had twice as many tracks on each disk "platter." Both new 3380 models had fewer components, which improved availability and ...
www-03.ibm.com/ibm/history/exhibits/storage/storage_3380c.html
The Model J found the correct information track in an average time of just 12 ... At the time, the CJ2 was IBM's lowest price 3380 disk storage subsystem for many .
Platters, tracks, cylinders, and sectors. The combined technology determines how densely bits can be packed on the disk. Have you every noticed an audio CD spins faster when reading toward the inside, and slower near the perimeter? Some hard drives use a different technique where the rpm's are the same but the electronics are faster toward the outside.
Data is accessed by blocks, several per sector. Physical block address: cylinder, track (platter), block. Logical block addressing: start at 0 and count up. The hard drive controller has its own firmware, with caching, error detection/correction, block remapping, …
Access latency comes from several sources:
- seek time
- Time to move the read/write head to the correct track and settle.
- rotational delay
- The platters constantly spin, wait for the block to show up.
Thus we see some pieces to the puzzle known as the THEORY of Everything.
en.wikipedia.org/wiki/Theory_of_everything
A theory of everything (ToE) or final theory, ultimate theory or master theory refers to the hypothetical ... ToE is one of the major unsolved problems in physics.
en.wikipedia.org/wiki/Grand_Unified_Theory
A Grand Unified Theory (GUT) is a model
Computer Earth system instructions for human automobile drivers ...
sundae.triumf.ca/pub2/SSP/subsection3_5_19.html
Table 4 lists the IBM instructions and Table 5 lists the SSP specific instructions. ... 05 BALR BRANCH AND LINK RR ... 04 SPM SET PROGRAM MASK RR
[PDF]
www.cse.iitd.ernet.in/~sak/courses/cdp/cards/IBM360.pdf
The term “computer architecture” was coined by IBM in 1964 for use with the ... These are R-R format instructions that either branch or set some system status; ... Instruction. Description. BAL. Branch and link. BC. Branch condition. BCT.
csc.columbusstate.edu/bosworth/.../CPSC3121_ExamReview02.pdf
RR (Register–to–Register) Format: Branch Instructions. There are two .... The solution chosen by IBM is that the 0 indicates “do not index”, and that the value of .... The instruction used is either BAL (Branch and Link) or BALR. The format of the ..
e786500e-f714-48d9-91b8-fe56149e7e0e|0|.0|ecc30d8e-03a8-48fa-b171-453c6904e8f2
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