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Chapter 4 - Memory Expansion Module Installation
4-11
Restrictions on EPROM Use
NEC EPROMs 27C1001, and 27C1002 cannot coexist on the same module
with battery backed RAM. These EPROMs draw significant current (>
1mA) through their Chip Select inputs and may cause failure of the back-up
battery. Signetics 27C256 may draw up to 10 uA through its Chip Select in-
puts when not powered. Though substantially less than the NEC part, it is
still much greater than the usage (typically < 1 uA) by other devices. Use of
such devices may limit battery life. It is your responsibility to determine the
proper devices for your application.
Flash EPROM Jumpering
To install Flash EPROMs, jumper the byte-wide sockets according to the
contents of Table 4-10, then plug in the devices.
Table 4-10.
Flash EPROM Jumpering
Name
Size
Bytes
Mfgr.*
Pins
Jumpering
W1, 6
W2, 7
W3, 8
W4, 9
28C256
29C256
28F256
28F512
28F010
28F020
32K
32K
32K
64K
128K
256K
Atmel
Atmel
Intel
Intel
AMD
Intel
28
28
28
28
32
32
1/2
1/2
1/2
1/2
1/2
1/2
5/6, 8/9
5/6, 6/9
2/3, 4/5, 6/9
2/3, 4/5, 6/9, 7/8
2/3, 4/5, 5/9, 7/8
2/3, 4/5, 6/9, 7/8
Open
Open
Open
Open
Open
Open
3/5, 4/6
3/5, 4/6
4/6
4/6
4/6
1/3, 4/6
* or
equivalent
Содержание XVME-976
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