Download Hypertec Hyperam AT - Users Manual

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HVPERAM AT
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Expanded memory window
The main feature of the board is the supply of up to 2 Mb
of memory compatible with the Lotus-Intel-Microsoft
Expanded Memory Specification. What this means is that
software applications that understand the EMS
specification can use memory above the 640 Kb limit
imposed by DOS.The expanded memory is accessed by a
64 Kb window that must appear in the AT address space;
the valid addresses are in the range COOO to EFFF. This
window must not conflict with other boards installed in
the machine. The address of the window is set by the pool
device driver software; the default address is DODO. This
address may be changed by passing a parameter to the
pool driver; see the Software Reference section for more
details.
Note: COOO may only be used if you do not have an
enhanced graphics adapter board. EOOO should only be
used ifyou have a Wang 260 PC.
Board Address An EMS specification memory board uses a set of
registers to control the hardware. If there are multiple
EMS boards in the machine, these registers must be set to different addresses. The following table indicates how to
set the register address on the Hyperam AT board.
Note: The correct default for Hyperam AT is 258. If this
default is not used, the address used must be passed as a
parameter to the pool device driver.
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