| Index | wersja polska |
The chip HD61710A01 is the main component of the Casio interfaces MD-100, FA-7, FA-80.
| Pin | Symbol | Function |
|---|---|---|
| 2..5 | A3..A0 | address signals connected to these inputs select the chip registers, the state of the input A3 seems to be ignored |
| 6..13 | IO0..IO7 | bi-directional data bus |
| 14 15 16 | OE WR CS |
bus interface signals |
| 17 | CNTL | input, high level = reset, low level = normal operation |
| 18 | INT | interrupt request output, active low |
| 22,23 | PON1,PON2 | low level turns the power supply for the internal logic on |
| 25 | P1 | |
| 26,27 | OSC1,OSC2 | ceramic resonator 612kHz, OSC1 is the output from the inverting oscillator amplifier |
| 29,30 | OSC3,OSC4 | quartz resonator 2.4576MHz, OSC4 is the output from the inverting oscillator amplifier |
| 31 | SELOSC | clock source option: high level selects the oscillator OSC1,OSC2 low level selects the oscillator OSC3,OSC4 |
| 33..40 | PD7..PD0 | printer data port |
| 42 43 44 | BUSY FAULT ACK |
printer status port |
| 45 46 | STROBE INIT |
printer control port |
| 47..54 | PB0..PB7 | general purpose input port, function depends on the interface unit: FA-7 - all pins connected to VSS FA-80 - state of the print mode switches MD-100 - data read from the FDD system The calculators PB-1000 and PB-2000C read this port to determine the kind of connected device. Assignment of values: &HFF - no I/O device present &H00 - FA-7 &H55 - MD-100 (value returned directly after the reset, before any FDD transfer) |
| 55..62 | PA0..PA7 | general purpose output port, function depends on the interface unit: FA-7, FA-80 - pin PA7 controls the cassette motor relay MD-100 - data written to the FDD system |
| 65 67 68 | EAR MIC PHASE |
cassette interface port |
| 70 | TXD | serial port transmit data output |
| 71 72 | RTS DTR |
serial port control signals |
| 73 | RXD | serial port receive data input |
| 74 75 76 | CTS DSR DCD |
serial port status signals |
| 77..79 | SW0..SW2 | baud rate select switches |
| A2 | A1 | A0 | Access | Function |
|---|---|---|---|---|
| 0 | 0 | 0 | Write | serial port control register bit 0 - MT/RS232C bit 1 - Odd/Even parity bit 2 - parity OFF/ON bit 3 - 7/8 data length bit 4 - 1/2 stop bit bits 5..7 - baud rate |
| 0 | 0 | 0 | Read | serial port status register bit 0 - set when TX buffer full, cleared after the byte has been transmitted bit 1 - set when RX buffer full, cleared after reading the RX data register 010 bit 2 - state of the CTS input bit 3 - state of the DSR input bit 4 - state of the DCD input |
| 0 | 0 | 1 | Write | serial port control register bit 0 - transmitter enable bit 1 - receiver enable bit 2 - state of the RTS output bit 3 - state of the DTR output |
| 0 | 0 | 1 | Read | serial port status register bit 0 - set when RX parity error bit 1 - cleared when RX framing or overrun error bit 3 - state of the SW0 input bit 4 - state of the SW1 input bit 5 - state of the SW2 input |
| 0 | 1 | 0 | Write | serial port control register |
| 0 | 1 | 0 | Read | serial port receive data register |
| 0 | 1 | 1 | Write | serial port transmit data register |
| 0 | 1 | 1 | Read | general purpose input port PA |
| 1 | 0 | 0 | Write | general purpose output port PB |
| 1 | 0 | 0 | Read | printer status port bit 0 - state of the BUSY input bit 1 - state of the FAULT input bit 2 - set by a pulse on the ACK input, reset by writing logical 1 to the bit 2 of register 110 |
| 1 | 0 | 1 | Write | printer data port PD |
| 1 | 1 | 0 | Write | printer control port bit 0 - state of the STROBE output bit 1 - state of the INIT output bit 2 - logical 1 resets the ACK latch |
| 000 | 9600 baud |
| 001 | 4800 baud |
| 010 | 2400 baud |
| 011 | 1200 baud |
| 100 | 600 baud |
| 101 | 300 baud |
| 110 | 150 baud |
| 111 | 75 baud |