The IBM 7090 and 7094 Systems

Figure 1: The IBM 7090 System
Figure 2: The IBM 7094 Console
Figure 3: 7090 Installation
This is a view of an IBM 7090. In the background are some of the IBM 729 tape handlers, and to the right is the computer and its 32K (36 bit words), oil-immersed core memories. These memories were designed originally for the IBM 7030, the STRETCH, but they were also used for the 7090 and the 7094 computers. These memories cost approximately about $1.00 per bit, or about one million dollars per memory unit. I cannot identify the persons in this picture.
Figure 4: The DD-80 Operator's Station
This is the DD-80 Operator's station. It was attached to the IBM 7090/7094 via the IBM data channel which delivered 36 bits every 6 microseconds. The Light Pen is the LLNL version. The simplicity of the console was well received by most users.
Figure 5: Extra Index Registers
The IBM 7094 used STRETCH core memory; it fetched a 72-bit word (2 7094 words) every 2 microseconds. This enabled to programmer to cut the memory traffic in half and thus sped the computer up over 30%.The box on the top of the console shows 4 extra index registers for a total of 7. We added a photosensor to the stop light so the operator could be alerted if the machine stopped. Note the cigarette burn. Can you imagine allowing smoking in the computer room today?
Figure 6: I/O Channels
Our 7094's came equipped with two I/O channels. The units pictured here, one for each I/O channel, were called Data Channel Controllers, the IBM 7617. They enabled the operator to interact with the operation of either channel. Generally, they weren't heavily used, but when they were needed, it was great to have them.
Figure 7: A Fast Card Reader
This clunky thing is a 150 card -per-minute card reader. For practically everyone, it was the principal means for initial input of a program, and input data. Note the clock on the top. Computer use accounting had not yet been developed, so one printed the time for starting and stopping on accounting cards. Later the accounting cards were keypunched and fed to an accounting program.
Figure 8: A Card Punch
This is also a clunky card handling machine, this time a punch. Looking back on things now, its hard to believe we used close to a million cards per month, then. When the photostore came on line, card usage gradually went to zero.
Figure 9: A Line Printer
A final clunky machine, this one, an online printer, rated at 150 lines per minute.
  Figure 10: An I/O Channel
A close up view of one of the I/O channels on the 7094