RAM/PROM/EPROM Area
System Area
The board is normally supplied with two 2764 EPROM devices installed in the system
area (J24 and 40) for the PME68/Monitor, or alternatively two 27256 EPROMs for
PLUM. These can be replaced with other devices; wire-wrap areas WC1 and WC2 pro-
vide the connections for address and control signals as detailed in Table 17.
Figure 15 shows the location of the EPROMs and wire-wrap area and Figure17 is the
wiring diagram.
Table 16 RAM/EPROM Pins
RAM/EPROM
2732
2764/128
27256
27512
6264
62256
PIN 1
O/C
Vcc
Vcc
A16
O/C
A15
PIN 26
Vcc
A14
A14
A14
Vcc
A14
PIN 27
O/C
Vcc A15
A15 R/W*
R/W*
System Connections
Table 17 System Area Jumper Field Settings
Device Type Device WC1
to
WC2
Connection
Pin
2732
26
WC1# 1 - WC2# 2
Vcc
27
WC1# 2 O/C
1
WC1# 4
O/C
2764 and 27128
26
*WC1# 1
-
WC2# 1
A14
27
WC1# 2 - WC2# 2 Vcc Default
1
WC1# 4
-
WC2# 2
Vcc
27256
26
WC1# 1 - WC2# 1
A14
27
WC1# 2 - WC1# 3
A15
1
WC1# 4
-
WC2# 2
Vcc
27512
26
WC1# 1
-
WC2# 1
A14
27
WC1# 2
-
WC1# 3
A15
1
WC1# 4
-
WC2# 4
A16
6264 and 62256 N/A for system area
* Not essential for 2764
NOTE:
2732 is a 24-pin device and should reside between pins 3 and 26 inclusive of
J24 and J40
PME68-1B Manual
Page 52 Issue 5
Содержание PME 68-1B
Страница 8: ...Figure 1 The PME 68 1B Board Photograph not available in PDF PME 68 1B Manual Page 2 Issue 5...
Страница 12: ...Figure 4 Component Layout Diagram P5 P4 P3 BAT PME 68 1B Manual Page 6 Issue 5...
Страница 56: ...Figure 14 Link Areas BAT PME68 1B Manual Page 50 Issue 5...
Страница 57: ...Blank Page PME68 1B Manual Page 51 Issue 5...
Страница 59: ...Figure 15 Location of System EPROM Area 1 2 3 4 1 2 3 4 WC1 WC2 PME68 1B Manual Page 53 Issue 5...
Страница 80: ...Figure 41 Location of BERR Jumpers 1 2 3 4 WK1 WK2 BR26 2 3 1 BAT PME68 1B Manual Page 74 Issue 5...
Страница 132: ...Blank Page PME68 1B Manual Page 126 Issue 5...