1. There is also a 4-bit volume control register per channel. 2. Reading the control register would automatically deassert / INTR. 3. The Audio Channel control registers provide volume and distortion control over individual sound channels. 4. Control registers always contained 7 bits, with the most significant bits always being 01.5. Typically, this would restore the control registers to known good values stored in ACIA was accomplished. 6. Each buffer had a control register and status register to monitor its state and configure the raising of interrupts. 7. Writes to that address program the FIFO control register , but there is no way to read it back. 8. Each oscillator has a 5-bit frequency divider and a 4-bit audio control register which manipulates the waveform. 9. Common tasks performed by control registers include interrupt control, switching the addressing mode, paging control, and coprocessor control. 10. On x86-64 processors in long mode, it ( and the other control registers ) is 64 bits long.
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