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Note 19.0 Disabling RAM on the MXV11-BF No replies
JAWS::KAISER 132 lines 25-MAR-1985 09:24
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+---------------+ +-----------------+
| d i g i t a l | | uNOTE # 019 |
+---------------+ +-----------------+
+----------------------------------------------------+-----------------+
| Title: Disabling RAM on the MXV11-BF | Date: 10-JAN-85 |
+----------------------------------------------------+-----------------+
| Originator: Mike Collins | Page 1 of 3 |
+----------------------------------------------------+-----------------+
This uNOTE describes how to disable the on-board memory of the MXV11-BF
multifunction module. There is also a comparison of features between
the MXV11-BF (with RAM disabled) and the combination of the MRV11-D and
DLV11-J modules.
DISABLING RAM ON THE MXV11-BF MODULE
WARNING!
The procedure outlined below for disabling the RAM requires
physical changes to the circuit board. Implementing this change
will void the warranty of the MXV11-BF as well as voiding any
field service contract for the board.
The procedure requires cutting one etch and adding one wire.
PROCEDURE (see figure below)
1. The etch cut can be achieved two ways.
Cut and bend up pin 13 of chip E17.
OR
On side 2 of module (the non-component side), cut etch
which connects E17 pin 13 to E26 pin 2.
2. Add wire between E17 pin 13 and E17 pin 14 (+5 Volts).
3. The on-board RAM is now disabled.
Page 2
MXV11-BF (M7195)
| |
| |
| |
| Pin 1 |
| | |
| | Pin 14 |
| | | |
| | | |
| | | |
| +-+ V V +-+ |
| Pin 1 ---> +-+ | | +-+ +-+ | | +-+ +-+ |
| | | | | | | | | | | | | | | |
| E26 -----> | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | |
| +-+ | | +-+ +-+ | | | | | | |
| +-+ ^ +-+ | | | | |
| | +-+ +-+ |
+-+ +-+ | |
| +---+ | | +-+
| | | E17 |
| | | |
+--------------------+ +--------------------+
COMPARISON OF THE MXV11-BF VERSUS THE COMBINATION OF MRV11-D AND DLV11-J
The following table lists several features common to both the MXV11-BF
with the RAM disabled and the MRV11-D / DLV11-J combination.
FEATURE MXV11-BF w/o RAM MRV11-D and DLV11-J
RAM None None
Boot ROMs MXV11-B2 MXV11-B2
SLU's 2 DLARTs 4 UARTs
4 baud rates 9 baud rates
No format options Many format options
(Start, stop bits, parity, # of bits, etc.)
Miscellaneous 4 Red LED's 14 unused ROM/RAM sockets
features 1 Green LED
Cabinet kit Currently N/A Available
+5 V 3.4A 2.6A
Heat diss. 16.65W 16W
Page 3
FEATURE MXV11-BF w/o RAM MRV11-D and DLV11-J
Slots 1 dual 2 duals
AC loads 2.3 4.0
DC loads 0.5 1.5
+12 V 0.1A 0.25A
When comparing the features on page 2, the MRV11-D/DLV11-J combination
works out better than the MXV11-BF. All of the features on page 3 show
the advantages of the MXV11-BF.
The MXV11-BF is the best choice in situations where backplane space and
loading is a primary concern. In terms of backplane space, if the
number of slots available is limited, the MXV11-BF is preferable since
it takes up one dual slot whereas the MRV11-D/DLV11-J combination
requires two dual slots.
In a large system where AC loading may be a concern, the MXV11-BF also
has an advantage over the MRV11-D/DLV11-J combination. The number of AC
loads the MXV11-BF presents to the bus is fewer than the two board
combination.
The most attractive use for the MXV11-BF is in a minimal yet powerful
two-board system i.e. KDJ11-A and the MXV11-BF. The advantages of such
a system are the size or form factor (only two dual height modules)
128Kb of RAM, 2 serial lines, bootstrap capability and the high
performance 11/73 CPU.
