Nonfiction 3

Byte - May 1976 by Virginia Williamson

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By Virginia Williamson

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Th e output freque ncy at pin 3 of IC1 shou ld be ad justed to 1760 Hz. This can be determined by using a freq uency cou nter or by ad justing the potenti ometer until good copy is obtai ned whil e the keyboard and adapter are co nnected directl y to the 33RO. iF. Most of the oth er term in als on the transm issi on side of the UART should be a hi gh level input, which mea ns that they can be left unconnected, sin ce th ey have internal pull ups . Th e exce ption is termin al 21 which is gro un ded.

A one bit represents a sta r, and a zero a bl ack hole. Bit o of the C register keeps track of positi on 5, The uni ve rse is set up in the beginning by clearin g the B register and setting C to om Figure 2: Positions in the universe are identified by numbers. octal. The D register, which will tally the number of shots fired, is also cleared as part of the initi ali za tion process. Each time the print universe routine is entered after a valid shot, the D register is increme nted to count the shot.

NO EROM IN THE Be sure Program Enable switch is OFF. Measure 5 V at pins 12, 13, 15,22, and 23. Measure 0 V at pi n 14. Measure -9 V at pins 16 and 24 . Ground pin 2 of the 7405 IC and measure 0 V at pin 24 of th e EROM socket . 6 . Ground pin 4 of 7405 IC and m easure 58 V at pin 15. 7. Ground pin 6 of 7405 and measure 47 V at pins 12, 14, 22, and 23. Adjust pot on NE550 for the 47 V. Pin 13 should remain at 5 V. Measure 9 V at pin 16. 8. Ground pins 6 and 8 of 7405 and measure 47 V at pin 13.

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