Chapter 4 - Memory Expansion Module Installation
4-9
Table 4-7. SRAM Jumpering
Name
Size
Mfgr.*
Pins
Jumpering
W1, 6
W2, 7
W3, 8
W4, 9
µPD43256A
MSM51257(L)RS
TC55257AP(L)
HM62256
HM628128
HM628512
32K
32K
32K
32K
128K
512K
NRC
OKI
Toshiba
Hitachi
Hitachi
Hitachi
28
28
28
28
32
32
**
**
**
**
**
**
5/6, 8/9
5/6, 8/9
5/6, 8/9
5/6, 8/9
4/7, 5/6, 8/9
1/2, 4/7, 5/6,
8/9
Open
Open
Open
Open
Open
Open
3/5, +
3/5, +
3/5, +
3/5, +
3/5, +
1/8, +
Notes
* or
equivalent
** 1/2 for software controlled write enable; 2/3 for writing always enabled
+ 2/4 connects back-up battery; 4/6 if back-up battery is not desired
To install NOVRAM devices, jumper the byte-wide sockets according to the
contents of Table 4-8, then plug in the devices. NOVRAM devices contain
batteries, therefore, off-board batteries are not required.
Table 4-8. NOVRAM Jumpering
Name
Size
Mfgr.*
Pins
Jumpering
W1, 6
W2, 7
W3, 8
W4, 9
DS1235Y
DS1245Y
32K
128K
Dallas
Dallas
28
32
**
**
5/6, 8/9
5/6, 8/9, 4/7
Open
Open
3/5, 4/6
3/5, 4/6
Notes
* or
equivalent
** 1/2 for software controlled write enable; 2/3 for writing always enabled
Summary of Contents for XVME-976/202
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