REPORT FOR ANALYTICAL CHEMISTS
special radioactive products and services
Radiation Materials Corporation's total capability and vast experience of technical staff are utilized in the selection of materials and method ology for preparation of radioactive products to meet the requirements of each application. Requirements may range from precisely defined activity levels using standard source configuration to sophisticated re quirements utilizing special design, manufacturing and calibration tech niques.
lines, is used to effect the desired action; i.e., transfer information to or from the computer (strobing) ; test for a given condition, turn a de vice on or off, etc. Up to 2° devices can be attached to the MB lines via the decoding AND gates. As the IOT pulses are generated sequentially in time, the output of the same device selector AND gate can be AND'ed with each of the three IOT pulses. Thus, the IOT 1 pulse can be used to clear a register and the IOT 2 pulse can be used to "strobe" new information into the register. Figure 8 shows a block diagram of the I/O interconnections of a typical device. Thus, the proper combination of device address code and IOT pulse is AND'ed with the accumulator lines causing transfer of information to the desired device only. With the same example, the instruction word 6231 would clear the register and 6232 would transfer the information into the register. As the IOT pulses are sequential in time, the combination code 6233 would clear and transfer.
The computer has a skip input which if pulsed during an I/O com mand causes the next instruction in sequence to be skipped. A device status signal is AND'ed with an IOT pulse and connected to the skip line. The status of the device (ready or not ready) is tested by programming the computer.
Thus the computer hangs up in the instruction loop 1 and 2 until the device is ready. An interrupt input allows the computer to be synchronized to the external world. An interrupt signal received by the computer causes it to get its next instruction (branch or jump) 'from a special location in the memory, depositing the location of where it was in another special location. In this way, the external device can control the computer action.
IOT 1
CLEAR"
IOT 2
COMPUTER MB LINE (6)
"TRANSFER AC TO REG"
ACCUMULATOR LINE (12) BIT 11 OF AC
In this era of rapidly developing nuclear applications, RMC regards special products and related ser vices as a major corporate activity. RMC provides the resources neces sary to maintain the highest level of performance required by the nuclear community. Write for catalog RADIATION 1 and Special Requirement Inquiry Forms.
TYPICAL F/F GATED r INPUT ^
Ο
1
2
3
4
5
EXTERNAL FLIP/PLOP REGISTER
RADIATION MATERIALS
(I/O COM MAND (NOT READY) (READY)
1 SKIP IF READY 2 JUMP BACK ONE 3
6
7
8
9
?f
^
T
TRUE SIGNAL TO "0" INPUT OF EACH FLIP/FLOP
C O R P O R A T I O N 124 C a l v a r y Street Waltham, Mass. 02154 Tel . (617) 899-6350 Circle No. 169 on Readers' Service Card
34 A
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ANALYTICAL CHEMISTRY
Figure 8. Block diagram of basic connections required to transfer infor mation from computer accumulator to external register.
