User`s guide
T-MOPSlcdSA User's Guide
Appendix F: Limitations and Hints 74
74
23. Appendix F: Limitations and Hints
23.1Unavailable ISA Signals
Due to the STPC Atlas microcontroller architecture, the following signals are not available on the
PC/104 bus (ISA):
IRQ3, IRQ4, IRQ7, IRQ12
23.2USB Ports
The power contacts for USB devices on Pin 1 and Pin 4 are not protected. They are suitable to
supply connected USB devices with a maximum of 500mA power dissipation. Do not supply
external USB devices with higher power dissipation through these pins. Always use a fuse for
power on external USB connectors; otherwise a defective USB device may damage the T-
MOPSlcdSA. Kontron recommends using a reset able fuse, which follows the USB 1.1 specification,
for power on external USB connectors.
23.3USB Devices
Some USB floppy disk drives and sticks make trouble by formatting. The following floppy devices
are known to fail:
Mitsumi D353GUE
Sony MPF88E–U1
Y-E USB-FDU
If you have problems to boot from an USB stick, set its “emulation type” in the BIOS setup to Hard
Disk. See the chapter USB Mass Storage Device Configuration Submenu for details.
An USB-Mouse will not work under DOS even if USB legacy support is enabled.
23.4Windows98 Support
The Win9x OS is not a targeted operating system of STPC. One known issue is that standby is not
supported under Windows 98.