serial interface
- two serial ports controlled by MC68681P
- up to 115200 bps transfer speed
- 3 byte FIFO buffer
- two 26 pin internal headers
- the first is directly wired to the DB9 connector on the slot cover of the card
- the second is for the ribbon cable of the DB25 connector on the separate slot cover
- the MC68681 is a 4 MHz version overclocked to 7 MHz in order to reach the 115200 bps transfer rate
- the 31250 bps MIDI rate is supported only when the 7.3728 MHz oscillator is replaced by 4 MHz - this disables the higher bitrates (115200, 57600, 33600, 19200)
- does not support the RI (Ring) signal
- supported by Linux and NetBSD
parallel interface
- one bidirectional DB25 parallel port controlled by MC6821P
- faster transfer speed than IOExtender's
- supported by Linux and OpenBSD
notes
- multiple Multiface 3 cards are supported in one machine
- no ROM or EPROM - no autoconfig drivers, duart.device (serial) and pit.device (parallel) have to be mounted with the supplied MFC program
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back side
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