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3 System Board (P/Ns D3657-63001 and D3661-63001)
Devices on the ISA Bus
• Bidirectional mode (PC/XT, PC/AT, and PS/2 compatible)
• Enhanced mode (Enhanced Parallel Port or EPP compatible)
• High speed mode (MS/HP Extended Capabilities Port or ECP
compatible).
It can be programmed as LPT1 (378h, IRQ7), LPT2 (278h, IRQ5), or
disabled.
Floppy Drive Controller (FDC)
The integrated Floppy Drive Controller (FDC) supports 3.5-inch and 5.25-
inch floppy disk drives, and tape drives. It is software and register
compatible with the 82077AA, and 100% IBM compatible. It has an A and B
drive-swapping capability and a non-burst DMA option.
Keyboard and Mouse Controller
The PC has an 8042-based keyboard and mouse controller (the socket pin
layouts are as shown on page 24). The C3758A keyboard is supplied for use
with the Windows 95 operating system (though it will also work with other
operating systems). It has the following capabilities:
• Space-bar power-on, to start the computer from the Off state (if
power on
from keyboard
is enabled in the Setup program).
• Windows key (next to the keys), which has the same effect as
clicking the Start button on the Windows 95 task bar.
• Pull-down key (next to the right key), which has the same effect
as clicking the right mouse button.
Real-Time Clock (RTC)
The real-time clock (RTC) is 146818A-compatible. The configuration RAM
is implemented as 256 bytes of CMOS memory.
Serial EEPROM
This is non-volatile memory which holds the default values for the CMOS
memory (in the event of battery failure, or the user pressing in Setup).