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.
10 lines
100 B
Plaintext
10 lines
100 B
Plaintext
INP(0)= 255
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INP(&H201)= 240
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COM1 LSR= 96
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PPI= 0
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CGA MODE= 0
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MOTOR OK
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STICK(0)= 128
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STRIG(0)= 0
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DONE
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