Was on a computer Siemens 4004 With BS1000 operating system César Luis Garrett developed the training program that now re-respects.
The RCA Spectra 70 da RCA Cumputers It was the first commercially available computer that made use of integrated circuits designed in RCA Computers labs.
Your user mode architecture is very similar to Sistemas IBM/360.. The interrupt mechanism was different as the supervisor mode. Thus, the Spectra line used different IBM operating system, for example BS1000
These systems were also marketed by English Electric (System 4) and Siemens, Siemens 4004. Siemens developed compatible processors and the BS / 1000 operating system. To see Project Unidata de 1972
EVOLUTION YEARS 60/70
Before the advent of the video terminals, the communication of the man with the computer was made by the console – type typewriter.
The card reader was the way used for the entry of the programs and data.
The files on perforated cards were replaced by storage in magnetic tapes.
With the advent of the tapes and magnetic disks, the operating systems – Tape Operation System and DOS – DISK OPERATION SYSTEM emerged.
Peripherals: card reader, magnetic tape drives, magnetic discs.
Before the advent of video terminals, man-machine communication and man-man was made by console (type typewriter).
The entry of the programs and data on cards was widely used, as well as the storage of the data on magnetic tape.
With the advent of magnetic discs, the operating system TOS – Tape Operation System It was replaced by the DISK OPERATION SYSTEM system.
Fully compatible with the IBM / 360 system, used the BS1000 operating system.
The devices were built by the RCA, USA at IBM and Siemens, and sold or rented in Brazil by ESC – systems and computers. As the typical computers of the time, computers the 4004 series, depending on the model, had a member of 32, 64 or 128 kb, card reader, tape drive and magnetic disks.
Siemens 4004 – 4 magnetic disk units with capacity of 7.2 MB each discLeft drive unit; Right printer 1200 Lin/min
Typical computer system at the time of 4004 Series 35 (mainframe!) With 64 kb of memory, a removable disk drive can store 7.2 MB.
The devices were built by the RCA, USA at IBM and Siemens, sold or rented here in Brazil by ESC – Systems and Computers Company, from Siemens AG.
