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IV-4. Summary of DIP Switch Setting
IV-4-1. Main Board
On the main board, there are two DIP switches. One has 8 elements and the other has 6 elements.
• S1 (8 elements)
Bit
Function
1
2
3
For optional RAMs
4
5
For optional 8087 coprocessor
6
7
For information to be displayed on the screen
8
For the number of FDD
Table 4-1
• Settings for Optional RAMs (bit 1 through bit 4)
The upper 4 bits of this DIP switch must be set according to an answer of the following expression.
Total RAM capacity in byte - 64K bytes
32K bytes
For example, if total 512K bytes of RAM are installed:
512K - 64K
=
14
=
E in hexadecimal
32K
and actual settings are illustrated as follows.
~~~~DDDD
1
2 3 4
5
6
7
8
Figure 4-9
Note:
If all of these switches are set to OFF position, the software automatically searches
the actual amount of RAM installed, and adjust usable RAM area to that amount.
The software supports in maximum of 640K bytes RAM.
• Setting for 8087 (bit 5)
When this optional LSI is installed, this bit shoule be reset from ON to OFF.
DDDD~DDD
DDDD~DDD
1
2 3 4
5
6
7
8
1
2
3
4
5
6
7
8
Figure 4-10
Not installed
Installed
30
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