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Apple II Computer Info

and then plugged into the Apple 16 pin socket found at J-14: (The junction

of the 3.3k resistor and the transistor base lead is floating). Pins 16

and 9 are used as tie points as they are unconnected on the Apple board.

(Figure 1a).

The "RS-232 Interface"

For this interface to be legitimate, it is necessary to twice invert the

signal appearing at J-14 pin 15 and have it swing more than 5 volts both

above and below ground. The following circuit does that but requires that

both +12 and -12 supplies be used. (Figure 2) Snipping off pins on the

DIP-component carrier will allow the spare terminals to be used for other

tie points. The output ground connects to pin 7 of the DB-25 connector.

The signal output connects to pin 3 of the DB-25 connector. The

"protective" ground wire normally found on pin 1 of the DB-25 connector may

be connected to the Apple's base plate if desired. Placing a #4 lug under

one of the four power supply mounting screws is perhaps the simplest

method. The +12 volt supply is easily found on the auxiliary Video

connector (see Figure S-11 or Figure 7 of the manual). The -12 volt supply

may be found at pin 33 of the peripheral connectors (see Figure 4) or at

the poer supply connector (see Figure 5 of the manual).

A Serial Out Machine Center Language Program

Once the appropriate circuit has been selected and constructed a machine

language program is needed to drive the circuit. Figure 3 lists such a

teletype output machine language routine. It can be used in conjunction

with an Integer BASIC program that doesn't require page $300 hex of memory.

This program resides in memory from $370 to $3E9. Columns three and four

of the listing show the op-code used. To enter this program into the Apple

II the following procedure is followed:

Entering Machine Language Program

1. Power up Apple II

2. Depress and release the "RESET" key. [Note: This is for Rev. 0 Apple

]['s!] An asterick and flashing cursor should appear on the left hand side

of the screen below the random text matrix.

3. Now type in the data from columns one, two and three for each line

from $370 to 03E9. For example, type in "370: A9 82" and then depress and

release the "RETURN" key. Then repeat ths procedure for the data at $372

and on until you cokmplete entering the program.

Executing this Program

1. From BASIC a CALL 880 ($370) will start the execution of this

program. It will use the teletype or suitable 80 column printer as the

primary output device.

2. PR#0 will inactivate the printer transferring control back to the

Video monitor as the primary output device.

3. In Monitor mode $370G activates the printer and hitting the "RESET"

key exits the program.

[Note: I know you don't need to know this, I'm entering it for

completion's sake and 'cause I find it amusing...]

Saving the Machine Language Program

After the machine language program has been entered and checked for

accuracy it should, for convenience, be saved on tape - that is unless you

prefer to enter it from the keyboard every time you want to use it.

The way it is saved is as follows:

1. Insert a blank program cassette into the tape recorder and rewind it.

2. Hit the "RESET" key. The system should move into Monitor mode. An

asterick "*" and flashing cursor should appear on the left-hand side of the

Apple II Computer Technical Information : Apple II Family Hardware Info

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