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PC/104 Expansion Bus
The VSBC-8 will accept up to four PC/104 and/or four PC/104-Plus expansion modules. Both
3.3V and 5.0V modules are supported.
A
RRANGING THE
If PC/104-Plus modules will be used, they go on the stack first (closest to the VSBC-8 circuit
board). The first module is called "slot 0", the next module is "slot 1", and the third module is
"slot 2". Make sure to correctly configure the "slot position" jumpers on each PC/104-Plus
module to match it's physical position in the stack.
The BIOS automatically configures the I/O ports and Memory map allocation, including
allocation of interrupts.
PC/104 modules are stacked on top of the PC/104-Plus modules; 16-bit modules first followed
by 8-bit PC/104 modules. Lastly, non-standard modules which lack feedthrough connectors
should be assembled on top of the stack.
Note
Some modules may require –12V and/or –5V for correct operation. Check that the
proper connections to the 3-pin auxiliary power input connector (J3) are made if
your expansion module(s) use these voltages. See pages 11 and 16 for details.
I/O C
ONFIGURATION
PC/104 Modules
PC/104 I/O modules should be addressed in the 100h – 3FFh address range. Care must be taken
to avoid the I/O addresses shown in the On-Board I/O Devices table on page 46. These ports are
used by on-board peripherals and video devices.
PC/104-Plus Modules
PC/104-Plus modules do not use CPU I/O addressing. No configuration is necessary except to
jumper the expansion module for the correct stack position.
VSBC-8 Reference Manual
S
TACK
PC/104 Expansion Bus
Reference – 45
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