IBM 7090 User Manual

computer. The transfer instructions greatly reduce program length by allowing program
loops and subroutine operation
Transfer
TRA +0020 (I)
Figure 5.3-27
The transfer instruction causes the computer to take its next instruction from loca-
tion X and resets the instruction counter to X. The address portion of the transfer in-
struction is substituted for the instruction counter when setting the address register to
locate the next instruction. The instruction counter is then set to this new address,
and the instruction sequence continues from the new location.
Transfer on MQ Plus TQP +0162(1)
Figure 5.3-28
If the sign of the MQ register is positive, a transfer will be taken to storage location
X. If the MQ sign is minus, the computer proceeds to the next instruction in sequence.
Transfer on Plus TPL +0120 (I)
If the sign of the accumulator is plus, a transfer is taken to storage location X.
If the sign is minus, the computer proceeds to the next instruction in sequence. TPL
is executed in the same manner as TQP, except that the AC sign rather than the MQ
sign is tested. See Systems 2.10.08.1.
Transfer on Minus TMI -0120 (I)
If the sign of the AC is minus, a transfer is taken to storage location X. If the AC
sign is plus, the computer proceeds to the next instruction in sequence. The execu-
tion of this instruction is the same as TQP, except that the AC sign rather than the
MQ sign is tested. See Systems 2. 10. 08. 1.
Transfer on Overflow TOV +0140 (I)
If the AC overflow trigger is on as a result of a previous operation, a transfer is
taken to storage location X, and the overflow trigger is turned off. If the overflow
trigger is off, the computer proceeds to the next instruction in sequence. Execution
of TOV is much like TQP, except that the overflow trigger rather than the MQ sign is
tested. See Systems 2. 10. 08. 1. The AC overflow trigger is turned off on Systems
2.10.36.1.
Transfer on No Overflow
TNO -0140 (I)
If the AC overflow trigger is off, the next instruction is taken from storage location
X. If the overflow trigger is on, no transfer is taken, and the overflow trigger is turned
off. Operation of this instruction is the same as TQP, except that the overflow trigger
rather than the MQ sign is tested.
Transfer on Quotient Overflow
TQO +0161 (I)
If the quotient overflow is on because of a previous operation, a transfer is taken to
storage location X, and the quotient overflow trigger is turned off. If the quotient over-
flow trigger is off, the computer proceeds to the next instruction in sequence. This is
a 704 compatibility instruction.
Transfer on Zero
TZE +0100 (I, L) Figure 5.3-29
If the contents of the AC (including the overflow positions) are zero, a transfer is
taken to storage location X. If the contents are not zero, the computer proceeds to
the next instruction in sequence. In either case the contents of the AC are not changed.
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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