DESCRIPTION
Name and Function ADDRESS BUS: The address bus provides the address to memory (up to 64K B-bit words) or denotes the I/O device number for up to 256 input and 256 output devices. Ao is the least significant address bit. DATA BUS: The data bus provides bi-directional communication between the CPU, memory, and I/O devices for instructions and data transfers. Also, during the first clock cycle of each machine cycle, the 80BOA outputs a status word on the data bus that describes the current machine cycle. Do is the least significant bit. SYNCHRONIZING SIGNAL: The SYNC pin provides a signal to indicate the beginning of each machine cycle. DATA BUS IN: The OBIN signal indicates to external circuits that the data bus is in the input mode. This signal should be used to enable the gating of data onto the B080A data bus from memory or I/O. READY: The READY signal indicates to the B080A that valid memory or input data is available on the BOBOA data bus. This signal is used to synchronize the CPU with slower memory or I/O devices.
Intel
