Display:
The Apple Computer outputs a composite video signal (composite of sync and video inforniation) which can be applied to any standard raster-scan type video display monitor. The output level is adjustable with the potentiometer located near the video output Molex connector, J2. The additional two outside pins on the Molex connector supply +5 and +12 volts, to be used in future Apple accessories. The composite video signal can also be modulated at the proper RF frequency, with an inexpensive commercially available device , and applied to the antenna terminals of a home television receiver. Since the character format is 40 characters / line, all television receivers will have the necessary bandwidth to display the entire 40 characters. Two large manufacturers of video display monitors, which connect directly with the Apple Computer, are Motorola and Ball. The mating four-pin Molex connector is provided.

AC Power Sources:
Two incoming AG power sources are required for operation: 8tolOVAG (RMS) at 3 amps, and 28vAC(RMS) Center-Tapped at lamp. These AC supplies enter the system at the Molex connector, 31. The 8 to 10 volts AC provides the raw AC for the +5 volt supply. while time 28 VCT supplies the raw AC for the +12 and -12 volt supplies, and the -SV supply is derived from the -12V regulated output.

The board, as supplied, requires no more than 1.5 amps DC from the +5V supply, while the regulator is capable of supplying 3 amps. The remaining 1.5 amps DC from the +5V supply is available for user hardware expansion (provided suitable transformer ratings are employed).

A suitable source of the raw AC voltages required, are two commercially available transformers; Stancor P/N P-8380 or equivalent (8 to 10 volts at 3 amps). and Stancor P/N P-8667 or

equivalent ( ZSVCT at 1 amp). Simply wire the secondaries to the mating six-pin Molex connector supplied, and wire the primaries in parallel, as shown in the schematic diagram (power supply section, Dwg. No. 00101, sheet 3 of 3.

TEST PROGRAM
After attaching the keyboard, display, and AC power sources, you can try a simple prograrn to test if your system and the attachments are functioning together properly. While it does not test many possible areas of the microprocessor system, the test program will test for the correct attachment of the keyboard, display, and power supplies.

    FIRST:
    Hit the RESET button to enter the system monitor. A backslash should be displayed and the cursor shoulddroptothe next line.

    SECOND:
    Type- 0 : A9 b 0 b AA b 20 b EF b FF b 08 b 8A b 4C b 2 b 0 (RET)
    (0 is a zero, NOT an alpha "O"; b means blank or space; and (RET) hit the "return" key on the keyboard)

    THIRD:
    Type- 0.A (RET)
    (This should print out, on the display, the program you have just entered.)

    FOURTH:
    Type- R (RET)
    (R means run the program.)

THE PROGRAM SHOULD THEN PRINT OUT ON THE DISPLAY A CONTINUOUS STREAM OF ASCII CHARACTERS. TO STOP THE PROGRAM AND RETURN TO THE SYSTEM MONITOR, HIT THE "RESET" BUTTON. TO RUN AGAIN, TYPE: R (RET).








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