Ddress Range - Intel SYSTEM 310 Configuration Manual

012B Board Jumpers
System 310
Table 3-4. 012B Jumpers for ddress Range 80000H-EFFFFH
Note: "X" means connected to ground. means not connected.
Upper Bound Lower Bound
Jumper Connection Jumper Connection
7-15
—
23-24 X
8-16
—
25-26
X
9-17 X 27-28 X
10-18
—
29-30 X
11-19
—
31-32 X
12-20
—
33-34
—
13-21 X 35-36 X
14-22 X 37-38
X
SEGMEN SELEC JUMPERS
Segment select jumpers assign the R M on the 012B board to one of
four pages; each page is 4 megabytes long. Once assigned, the R M
block addresses begin on that specific page boundary. Since the
86-based System 310's address only 1 megabyte of memory, these
jumpers are always preset to select the page with the lowest starting
address, segment 1.
Table 3-5 shows the jumper connections that select each segment on
the 012B board; two pairs are needed. If you use this board in a
system capable of addressing more than 4 megabytes, such as the
286-based System 310, select any of the page boundaries shown, in
this table.
Table 3-5. 012B Board Segment Select Jumpers
Jumpers
Connected
Segment
Selected
ddress Range
in Hex
1-2, 4-5<M5
1
000000-3FFFFF
2-3, 4-5
400000-7FFFFF
1-2, 5-6 3 800000-BFFFFF
2-3, 5-6
4 C00000-FFFFFF
HALF- OR FULL-MEMORY SIZE
You can use all four 64K banks of memory on the 012B board or mask
off half (two banks) with the half- or full-memory size jumpers.
These three jumpers are named for a signal line found on the 012B
board schematics.
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