5000MC  (250-6000/1/2)              Memory              Faxback Doc. # 1723

Memory Chip Kits - 

256K SIMMS
    **25-5135 consists of two 256K X 9 SIMM chips at 80 nanoseconds. 
    **25-5031 consists of four 256K x 9 SIMM chips at 100 nanoseconds.  The
        individual chips can be ordered from Tandy National Parts under
        cat# 25-6000, part# MX-0384.  

1MB SIMMS 
     25-5137 consists of two 1 MB x 9 SIMM chips at 60 nanoseconds.
    **25-5134 consists of two 1 MB x 9 SIMM chips at 80 nanoseconds.
    **25-5033 consists of two 1 MB x 9 SIMM chips at 100 nanoseconds.

Memory Boards 

    **25-6030 is a specialized 32-bit access memory expansion board for
        the 5000MC.  This product can be ordered from Tandy National Parts.

** = Discontinued Radio Shack product


+---------------------------------------------------------------------+
|    |  Replace memory chips |   Second Memory   |  Add to            |
|    |  memory adapter       |   adapter         |  Second adapter    |
|----+-----------------------+-------------------+--------------------|
|4MB |      N/A              |     25-6030       |  (8) MS-0384       |
|----+-----------------------+-------------------+--------------------|
|8MB |    (4) 25-5137        |      N/A          |     N/A            |
|----+-----------------------+-------------------+--------------------|
|16MB|    (4) 25-5137        |     25-6030       |  (4) 25-5137       |
+---------------------------------------------------------------------+

Install the SIMM kits according to the instructions in the Owners 
Manual for the memory chips.

In addition to installing the SIMM chips, you must also change some of
the computers Dips switches and change some Jumpers according to the 
charts below.. 

Dip Switch are tiny rows of switchs on the main logic board.  They will
be labeled S-1 and S-2.  Usually, this label is silk screened (painted)
on the main logic board very near the switches.  The label on the main 
logic board will also indicate which direction is ON and OFF, look 
carefully.  Configure them according to this chart, for the amount of 
memory available.

        2MB           4MB            8MB           16MB
+--------------------------------------------------------------+
|S-1| 4       ON  | 34       ON  | 46      ON  | 346     ON    |
|   | 1235678 OFF | 125678   OFF | 123578  OFF | 12578   OFF   |
|---+-------------+--------------+-------------+---------------|
|S-2| 148     ON  | 48       ON  | 14      ON  | 4       ON    |
|   | 23567   OFF | 123567   OFF | 235678  OFF | 1235678 OFF   |
+--------------------------------------------------------------+
    ( default )

The term Jumpers actually refers to two different things.  First there are
Staking Pins, they appear to be two small (or a series of pins) sticking 
out of the main logic board.  They will be labeled with silk screening
on the main logic board.  The Jumper is actually a small plastic box that
fits over the two Staking Pins.  Frequently however, the Staking Pins and 
Jumpers are just referred to as Jumpers.  Putting a jumper over the
Staking Pins is called jumpering.  Jumper the pins indicated below for the
amount of memory available. 

Jumpers:
+------------------------------------------------+
|Memory | Jumper these four pairs of pins:       |
|-------+----------------------------------------|
|   2MB |  E9-E10   E11-E12   E14-E15   E16-E17  | (default)
|-------+----------------------------------------|
|   4MB |  E9-E10   E11-E12   E14-E15   E16-E17  |
|-------+----------------------------------------|
|   8MB |  E9-E11   E10-E12   E14-E16   E15-E17  |
|-------+----------------------------------------|
|  16MB |  E9-E10   E11-E12   E14-E15   E16-E17  |
+------------------------------------------------+