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In this system, this bit is always set to "1".
MODEL:T1200H/HB
Page E-1
E.1 GENERAL
This gate array is compatible with Lotus/Intel/Microsoft
Expanded Memory Specification, and is composed of 100 pins
altogether.
Within the memory address space C4000H-EFFFFH, the
consecutive 64-kbyte space is reserved as the EM window.
Each EM unit can control up to 2 Mbytes (128 pages), and as
one system can control up to four EM units, the whole system
can have maximum 8-Mbyte space.
All of this is possible in theory, but in fact, as there is
a limit in the real installation, the maximum 384-kbyte
address space is provided as its standard mode.
I/O ports used for the EM unit are 2X8H-2XFH, and different
I/O port is assigned for each unit (X can be any of the
numbers - 0, 1, 5, 6, A, B, E).
Through the Page Register in the EM assigned to this I/O
port, 64-kbyte window can be assigned on the Expansion
Memory.
MODEL:T1200H/HB
Page E-2
E-2 MEMORY ASSIGNMENT FOR THE EM UNIT
FIGURE E-1 MEMORY ASSIGNMENT FOR THE EMU
MODEL:T1200H/HB
Page E-3
E.3 PIN DESCRIPTION
TABLE E-1 Pin Description
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