Stereo Scan 440 - DCU

Appendix ~
The Stereoscan 440 PC! AT backplane consists of six 16-bit standard AT bus
slots. two of which are used. If the Stereoscan 440 has any factory fitted options.
then some of the free slots may be occupied. for example the WORM drive
interface occupies one slot.
Each card that is installed must not interfere with the cards already installed on
the bus. There are four areas in which a card may interfere with the ex.isting
hardware. memory. I/O. DMA channels and interrupts.
The following sections deal with each of these areas in turn. Space is provided in
each table which may be used to record the settings of installed cards.
Memory
The standard PC memory map for DOS reserves space in the 640kB to 1 MB
range for ROM BIOS code and display memory. The gaps left between the
standard components are available for other options. For example a network card
may have a small amount of SRAM in which to buffer communicated data, this
SRAM would be configured in a spare address in the 640kB to 1MB range.
Address
AO(XX)-BFFfF
COOOO-C7FFF
The following shows the memory map of a standard Stereoscan 440 in the 640kB
to IBM range:-
C8000-C}o-pf'F-
~DFFfF
EOOOO-t!.I'-I-1'1'-
RXX)O-FFfFF
Descri
VGA
VGA BI - -
Leica Hardware
I System BIOS ROM
There are two regions available for use by optional cards, C8000 to CJ:'"J:'"J:'J:' and
EOOOO to EFFFF. Any extra cards fitted should therefore be configured to use a
range in these areas.
Stereoscan 440 ODeraror Manual