44 lines
1.4 KiB
Plaintext
44 lines
1.4 KiB
Plaintext
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DB25 J1 Pinout
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1: Chassis ground
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2: IC Z3 pin 5 (Channel B Out, inverted)
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4: Opto isolator (+) to cpu
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7: IC Z1 pin 2 (Channel A Out)
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8: IC Z1 pin 5 (Channel B Out, inverted)
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10: IC Z2 pin 5 (Channel B Out, inverted) - Keyboard output here.
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13: VCC +5V ( draws up to 650mA - do not exceed 7V )
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15: IC Z3 pin 6 (Channel B Out)
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17: Opto isolator (-) to cpu
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20: IC Z1 pin 3 (Channel A Out, inverted)
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21: IC Z1 pin 6 (Channel B Out)
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23: IC Z2 pin 6 (Channel B Out) - Keyboard output here.
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25: GND
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+------------+---------+
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| IC+Channel | J1 pins |
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+---------+------------+---------+
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| OUTPUTS | Z1 Chan A | 2, 20 |
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+---------+ Z1 Chan B | 21, 8 |
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| Z2 Chan B | 23, 10 | <- Only thing with actual data?
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| Z3 Chan B | 15, 2 |
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+---------+============+=========+
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| INPUT | Z14 Input | 4, 17 |
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+---------+------------+---------+
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IC Z1/Z2/Z3 Pinout
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Pin 1: Input A Pin 9: Input C
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Pin 2: Channel A OUT Pin 10: Channel C OUT
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Pin 3: Channel A OUT (i) Pin 11: Channel C OUT (i)
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Pin 4: ENABLE Pin 12: ENABLE (i)
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Pin 5: Channel B OUT (i) Pin 13: Channel D OUT (i)
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Pin 6: Channel B OUT Pin 14: Channel D OUT
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Pin 7: Input B Pin 15: Input D
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Pin 8: GND Pin 16: VCC +5V
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With 410 uS being the smallest bit time, that gives us a 1/t of 2.43 KHz
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which makes it a rate of 2400 baud.
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