* A15-A0 (Address bus; Output from CPU). A15-A0 form a 16-bit address. A15-A0 are used to specify a memory address or an I/O address.
* /BUSAK (Bus Acknowledge; Output from CPU). When /BUSAK="0" the CPU is signalling that control of the address bus, data bus and output signals has been released, and the device can take control.
* /BUS RESET (Bus Reset; Input to ???PIO/CPU)??Acts similarly to /RESET but also resets the PIO chip.
* /BUSRQ (Bus Request; Input to CPU). When /BUSRQ="0" a device is requesting control of the address bus, data bus and the CPU's output signals. At the end of the current instruction cycle, the CPU will issue a Bus Acknowledge.
* CURSOR (Cursor; Output from CRTC). When CURSOR="1" the CRTC is displaying the cursor.