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The keyboard controller circuitry on the TP400 is contained within the Super I/O chip,
and also includes a PS/2 style mouse port. The keyboard uses the IRQ1 interrupt line
and the mouse uses IRQ12. Connections to the keyboard and mouse are made
through the 50-way J4 connector. On the TCDEVPLUS these are routed to two PS/2
style connectors (6-pin mini-DIN connectors). On the TCDEV the keyboard connector
is a 5-pin DIN connector and the mouse connector is a 6-pin mini-DIN connector.
3.8
FLOPPY DISK DRIVE
The TP400 includes an on-board floppy disk controller. The floppy disk controller
electronics are included within the Super I/O chip.
Due to a limitation on PCB space the floppy disk controller is accessed through a 26-
way flat flexible cable connector, J105, rather than the more common 34-way IDC
connector. The 26-way connector is used on floppy disk drives used in laptop PCs.
The cable carries power as well as control and data signals. The laptop floppy drives
tend to be much smaller than the drives used in desktop PCs. The signals used on
the flat flexible cable are the same as used on the 34-way connector, so if necessary
the more common floppy drives could be driven.
DSP Design is able to supply suitable floppy disk drives and the 26-way cable. We
are also able to supply an adapter board called the DIS35-26 that allows the 26-way
cable to connect to drives with the usual 34-way connector.
The TCDEVPLUS development system incorporates a complete floppy system,
including a floppy diskette drive and cable. The TCDEVPLUS also provides an IDE
disk controller. Connection to the TP400 is via the PC/104 bus.
Users will probably prefer to use the TCDEVPLUS floppy controller while using the
TCDEVPLUS. To do this the TCDEVPLUS floppy disk controller must be enabled at
jumper area E5. The TP400’s on-board floppy disk controller may be optionally
disabled, using the Setup program (Advanced / I/O Device Configuration menu). If it
is not disabled the TCDEVPLUS’s floppy drive will be used anyway, and you will
receive a warning message on the screen.
The floppy disk circuit uses an interrupt (IRQ6) and a DMA channel (DREQ2 and
/DACK2). These can be re-assigned to other uses if the floppy disk controller is not
used.
3.9
IDE DISK DRIVE
The TP400 includes an on-board IDE disk controller. The IDE disk controller
electronics is included partly within the CS5530A chip and partly within the disk drive
itself.
The IDE port can connect to hard disks, CD-ROM drives and Compact Flash cards,
which behave like small hard disk drives.
The IDE port is capable of high speed data transfer modes, referred to as PIO modes
0 - 4. Normally the BIOS will interrogate the drives attached to the TP400 and set the
highest possible transfer speed.
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Страница 136: ...J2 164004 C03 FIGURE J1 TP400ET MECHANICAL DRAWINGS FIGURE J2 TP400ET CIRCUIT DIAGRAM ...
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