I/O Board
- Four serial ports (9-pin D-shell)
- One mouse port, PS/2-type
- Two joystick ports (15-pin D-shell)
- Two MIDI out ports
- Two MIDI in ports
- Three infrared (IR) I/O ports (6-pin mini DIN)
- One internal CD audio line-level input (5-pin strip)
- One internal microphone audio input (4-pin strip)
- One internal headphone audio output (4-pin strip)
- Two line-level RCA inputs (L/R)
- Two line-level outputs (L/R)
- One microphone input 3.5 mm stereo phono jack
- One headphone output 3.5 mm stereo phono jack
- A 16-bit stereo sound system @ 48 and 44.1 kHz
- One "GeekPort" (37-pin D-shell)
- An experimental-electronic-development oriented port, backed by three fuses on the mainboard.
- Digital and analog I/O and DC power connector, 37-pin connector on the ISA bus.
- Two independent, bidirectional 8-bit ports
- Four A/D pins routing to a 12-bit A/D converter
- Four D/A pins connected to an independent 8-bit D/A converter
- Two signal ground reference pins
- Eleven power and ground pins:
- Two at +5 V, one at +12 V, one at -12 V, seven ground pins.
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