e100290dd3
New portio.c module following the virmem.c dispatch-by-address pattern, emulating 8253 PIT channel 2 (speaker frequency), PPI port B (speaker on/off), CGA mode/color select registers, game port (joystick stub), COM1 serial (transmitter-ready stub), and floating bus default (0xFF). OUT/WAIT/MOTOR statements and INP()/STICK()/STRIG() functions now fully functional. Continuous tone generation via PulseAudio pthread worker for programs that drive the speaker through OUT &H43/&H42/&H61.
16 lines
297 B
C
16 lines
297 B
C
#ifndef PORTIO_H
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#define PORTIO_H
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#include <stdint.h>
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/* Read a byte from an I/O port */
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uint8_t portio_inp(uint16_t port);
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/* Write a byte to an I/O port */
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void portio_out(uint16_t port, uint8_t value);
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/* Reset all port state (called on NEW, CLEAR, RUN) */
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void portio_reset(void);
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#endif
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