Module Comparisons Third-Party Products Functional Information

Read Only Memory Modules


The modules listed below are the available ROM modules. These include multifunction modules, equipped with ROM sockets.

Memory Modules and Their Attributes
Module Number M8012 M7942 M8021 M8048 M8578 M8047 M7195-FA
Model Number BDV11 MRV11-A MRV11-B MRV11-C MRV11-D MXV11-A MXV11-BF
Introduced 1977 1975 1977 1980 1982 1980 1983
Discontinued 1981
Module Size Quad Dual Dual Dual Dual Dual Dual
Q-bus Addressing 16-bits 16-bits 16-bits 18-bits 22-bits 18-bits 22-bits
ROM Sockets 24 32 8 16 16 2 2
Socket Size 24-Pin 16-Pin 24-Pin 24-Pin 28-Pin 24-Pin 28-Pin
Largest ROM 2K x 8 512 x 4 1K x 8 4K x 8 32K x 8 2K x 8 8K x 8
AC Bus Load 2 1.8 2.8 2 3 2 2.3
DC Bus Load 1 1 1 1 0.5 2 0.5
+5V Load 1.6 A 2.8 A 0.6 A 0.8 A 1.6 A 1.2 A 3.5 A
+12V Load 0.7 0.0 0.5 N/A N/A 0.01 A 0.06 A


ROM modules are most useful for holding bootstrap routines. For this purpose, the MXV11-B2 bootstrap ROMs are preferred, due to their support of a wide range of devices. These ROMs come standard on the M7195-FA and can be installed on the M8578 module. Because these two modules also have 22-bit support, they tend to be the most desirable (and expensive) of the group. The M7195-FA also has the benefit of having RAM memory, two serial ports, a line time clock and line time clock register, which makes it more useful.


Additional Resources

Anti Spam