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Appendix B |
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| I/O Interface Board | |
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| J5 | Signal | OnBoard | Description |
| Pin # |
| Pin # |
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| 17 | PD7 | Parallel Data 7 – Refer to PD0, pin 3, for more information. | |
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| 18 | GND | GND | Ground |
| 19 | ACK* | Parallel Acknowledge – Status output signal from the printer. A Low | |
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| State indicates it data received and is ready to accept new data. |
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| DS1 | Floppy Drive Select 1 – Selects drive 1. | |
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| 20 | GND | GND | Ground |
| 21 | BSY | Parallel Busy – Status output signal from the printer. A High State | |
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| indicates the printer is not ready to accept data. |
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| MTR1* | Floppy Motor Control 1 – Selects motor on drive 1. | |
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| 22 | GND | GND | Ground |
| 23 | PE | Parallel Paper End – Status output signal from the printer. A High | |
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| State indicates it is out of paper. |
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| WData* | Floppy Write Data – Encoded data sent to drive for write operations. | |
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| 24 | GND | GND | Ground |
| 25 | Slct | Parallel Select – Status output signal from the printer. A High State | |
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| indicates it is powered on. |
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| Wgate* | Floppy Write Gate – Enables drive current flow in the write head. | |
| 26 | IRFIRM | Infrared Function Mode Select – To external device from | |
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| 27 | PM_Sus | Power Management Suspend Clock – | |
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| Clk |
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| 28 | GND | GND | Ground |
| 29 | IRTX | IR Transmit Data – To infrared transceiver TX pin (U2, | |
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| 30 | IRRX | IR Receive Data – To infrared transceiver TX pin (U2, | |
| 31 | SPKR+ | Speaker + Drive – To positive terminal on Beep Speaker (LS1) | |
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| 32 | GND | GND | Ground |
| 33 | RstSW | Reset Switch – Puts ground on this pin when pressed. | |
| 34 | PwrBtn | Power On Switch – Puts ground on this pin when pressed. | |
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| 35 | KBDT | Keyboard Data signal | |
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| 36 | KBCK | Keyboard Clock signal | |
| 37 | GND | GND | Digital Ground |
| 38 | VCC | VCC | +5V |
| 39 | BATV+ | Battery + Voltage – To + terminal on Battery socket (BAT1). | |
| 40 | GND | GND | Ground |
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Notes: The shaded area denotes power or ground. The signals marked with * = Negative true logic.
CoreModule 800 | QuickStart Guide | 27 |