Block Diagram
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3-9
3
The ISASIO disk drive controller is compatible with the DP8473, 765A,
and N82077 devices commonly used to implement floppy disk controllers.
Software written for those devices may be used without change to operate
the ISASIO controller. The ISASIO device may be used to support any of
the following devices:
❏
3
1
/
2
-inch 1.44MB floppy disk drive
❏
5
1
/
4
-inch 1.2MB floppy disk drive
❏
Standard 250kbps to 2Mbps tape drive system
Keyboard and Mouse Interface
The National Semiconductor PC87307 ISASIO chip is used to implement
certain segments of the ROM-based keyboard and mouse interface control.
The keyboard and mouse control signals are routed to a single 6-pin
circular DIN connector on the transition module. Keyboard functions can
be obtained by plugging the keyboard directly into this connector. To get
both keyboard and mouse functions requires a Y adapter cable (Motorola
Part Number: 30-W2309E01A). Refer to the TMCP700 Installation and
Use manual for details.
PCI Peripheral Bus Controller (PBC)
The MCP750 uses the VIA Technologies VT82C586 Peripheral Bus
Controller (PBC) to supply the interface between the PCI local bus and the
ISA, IDE, and USB systems I/O bus (illustrated in
Figure 1-1
).
The PBC controller provides the following functions:
❏
ISA (Industry Standard Architecture) bus arbitration for DMA
devices
❏
ISA interrupt mapping
❏
USB v1.0/HCI v1.1 compatible host/hub interface with two ports
❏
Enhanced IDE Controller with ultra DMA-33 support
❏
Interrupt controller functionality to support 14 ISA interrupts
