In addition to the spinoff, which was announced Tuesday, 3M will close its audio and video tape units, resulting in a $ 600 million pretax charge in the fourth quarter and the loss of 5, 000 jobs.
32.
At various times and in various configurations, flexos came with 5, 6, 7 or 8 channel paper tape reader / punches, could have several auxiliary paper tape units attached, and could also attach to IBM punched card equipment.
33.
The CPT 4200 was followed in 1976 by the CPT VM ( Visual Memory ), a partial-page display-screen dual-cassette-tape unit, and shortly thereafter by the CPT 8000, a full-page display dual-diskette desktop microcomputer that drove stand-alone daisy wheel printers.
34.
A circuit in the tape unit transforms the analog signal into a logical one or zero, which is then transmitted to the computer via the Complex Interface Adapter ( 6526 ) in the C64 senses when the signal goes from one to zero.
35.
One featured four T1600 / T1800 tape units ( manufactured by Pertec ), two floppy disk units ( manufactured by IBM or Pertec ) and four D1400 / D3400 rigid disk units ( 4.4, 8.8, 17.6 MB formatted capacity, manufactured by Pertec or Kennedy ).
36.
A major product was RDS ( Remote Device Support ), in which an IBM mainframe could connect to an adapter through its FIPS channel, which would communicate over a trunk to an adapter with a comms link, possibly to another continent, where it could drive a remote FIPS channel to drive IBM peripherals such as tape units, printers and the like.
37.
It was theoretically possible-and certainly the addressing structure allowed for it-for each tape channel to be split through additional hardware units into a sub-group of eight tape decks, giving a theoretical maximum of 64 on-line tape units . ( In fact, the absolute maximum would have been slightly less, since at least three uniquely coded I / O channel identifiers were required for other devices .)
