Radstone PME 68-1B, Manual

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User Area
The user area (J25 and 41) will accept two devices (of the same type) from those de-
tailed in Table 16. Address and control lines are defined by wire-wrap areas WD1 and
WD2. The standard (default) devices are a 2764/27128 EPROM.
Table 18 defines the jumper field settings required for these devices. Figure 16 shows
their location and Figure 17 is the wiring diagram of the wire wrap areas.
Table 18 User Area Jumper Settings
Device Type Device WD1 to WD2 Connection
Pin
2732 EPROM 26 WD1# 1 - WD2# 2 Vcc
27 WD1# 2 - O/C
1 WD1# 4 - O/C
2764/27128 EPROM 26 WD1# 1 - WD2# 1 A14
27 WD1# 2 - WD2# 2 Vcc Default
1 WD1# 4 - WD2# 2 Vcc
27256 EPROM 26 WD1# 1 - WD2# 1 A14
27 WD1# 2 - WD1# 3 A15
1 WD1# 4 - WD2# 2 Vcc
27512 26 WD1# 1 - WD2# 1 A14
27 WD1# 2 - WD1# 3 A15
1 WD1# 4 - WD2# 4 A16
6264 SRAM 26 WD1# 1 - WD2# 2 Vcc
27 WD1# 2 - WD2# 3 R/W*
1 WD1# 4 - O/C
62256 SRAM 26 WD1# 1 - WD2# 1 A14
27 WD1# 2 - WD2# 3 R/W*
1 WD1# 4 - WD1# 3 A15
* Not needed for 2764
NOTE: 2732 is a 24-pin device and should reside between pins 3 and 26 inclusive
of J25 and J41.
PME68-1B Manual
Page 54 Issue 5