IBM 7090 User Manual

7607 Data Channel Modell
716 Printer
721 Card Punch
711 Card Reader
7607 Data Channel Model 2
729 II
Magnetic Tape Unit
729 IV Magnetic Tape Unit
The reader, punch, and printer can be used only with the 7607 Data Channel Modell.
The 729 II and 729 IV tape units can be intermixed on either model data channel.
The IBM 7100 CPU is the control center of the 7090 system. In addition, all arith-
metic and logic circuits are located in the CPU. The CPU receives information from
storage, decodes it, and performs the necessary operation. Even though 1-0 is an
independently functioning section, its operation must be initiated from the CPU.
The IBM 729 II and 729 IV Magnetic Tape Units write information on magnetic tape
or read information from magnetic tape. The two models perform indentical functions,
but the 729 IV moves tape at a higher rate than the 729 II.
The IBM 711 Card Reader reads information from punched cards at 250 cards per
minute.
The IBM 716 Printer prints information from core storage at 150 lines per minute.
The typewheel echo pulses are available to the 7090 system, where they mayor may
not be used to check the accuracy of printing.
The IBM 721 Card Punch punches information from core storage at 100 cards per
minute.
The IBM 7607 Data Channel Models 1 and 2 control the flow of information between
the 1-0 units and core storage. A 7607 Modell can control any combination of ten
729 II and 729 IV tape units and up to one each of reader, punch, and printer. The
printer must be present if either a reader or punch are to be used. A 7607 Model 2
can control ten tape units, but neither card machines nor printer. The 7090 system
may include up to eight data channels.
Each data channel can be regarded as a subsystem, with its own manual control
console and indicator panel. Once a data channel is set in operation by an instruction
in the CPU program, it can call in its own instructions (called commands in channel
operations). These commands make up what is known as an 1-0 program. This pro-
gram controls the operation of the 1-0 unit that is selected and also provides informa-
tion to or receives information from that 1-0 unit. Information received from an 1-0
unit is placed in core storage, or information is taken from core storage to be supplied
to a selected 1-0 unit.
The CPU handles instructions that select a particular data channel and the 1-0 device
on that channel. The CPU is also responsible for supplying the channel with its first
command. This first command can be the first of a series of commands (1-0 program)
that will sustain the selected channel and device in operation independently of the CPU.
\Vhen this 1-0 program has run its course, the selected device stops and the operation
is complete.
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IBM 7090 Specifications

General

Category	Mainframe Computer
Introduced	1959
Transistor-based	Yes
Word Length	36 bits
Add Time	4.8 microseconds
Memory	Core memory
Memory (words)	32, 768 words