“IBM 726”的意思、由来-开放百科全书

词条

IBM 726

释义

References

The IBM 726 dual magnetic tape reader/recorder for the IBM 701 was announced on May 21, 1952. Unlike later IBM 7 track drives, the 726 could read backwards as well as forwards.

The tape had seven parallel tracks, six for data (called a copy group, not a character) and one to maintain parity. Tapes were recorded in odd parity, to ensure at least one bit transition per

copy group as well as for error checking. ^[1]

The 726 concurrently handled two reels of tape, and there were two 726 units in an IBM 701 system. ^[2]

Tracks	6 Data, 1 parity
Copy groups/inch	100 copy groups/inch
Tape speed	75 Inches/sec
Transfer rate	7 500}} copy groups/sec
End of record gap	1 Inch - 100 chars - 16.67 words
Start time	10 ms
Stop time	10 ms
Width of tape	1/2 inch
Length of reel	1 200 feet}}
Composition	Cellulose acetate base

References

1. ^Innovations in the Design of Magnetic Tape Subsystems (PDF)
2. ^IBM 726 Magnetic tape reader/recorder

2 : IBM storage devices|IBM 700/7000 series

随便看

开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。