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# ALPHA MICROSYSTEMS
AM-740
Card Type Memory
Maximum Onboard Memory 128MB
I/O Options Board connector (1)
Data Bus VMEbus
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|---------------------+----------+----------------+----------|
| Board connector | CN1 | VMEbus | CN3 |
|---------------------+----------+----------------+----------|
| Parity status LED | CN2 | VMEbus | CN4 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Note: The size and number of chips are unidentified. |
| This memory board will be factory installed with 4MB, |
| 8MB or 12MB. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BASE MEMORY SELECTION |
|------------------------------------------------------------|
| Size | W8 |
|---------------+--------------------------------------------|
| None | 1 & 2, 3 & 4, 5 & 6, 7 & 8, 9 & 10, 11 & |
| | 12, 13 & 14, 15 & 16 |
|---------------+--------------------------------------------|
| 4MB | Open |
|---------------+--------------------------------------------|
| 8MB | 1 & 2 |
|---------------+--------------------------------------------|
| 12MB | 3 & 4 |
|---------------+--------------------------------------------|
| 16MB | 1 & 2, 3 & 4 |
|---------------+--------------------------------------------|
| 20MB | 5 & 6 |
|---------------+--------------------------------------------|
| 24MB | 1 & 2, 5 & 6 |
|---------------+--------------------------------------------|
| 28MB | 3 & 4, 5 & 6 |
|---------------+--------------------------------------------|
| 32MB | 1 & 2, 3 & 4, 5 & 6 |
|---------------+--------------------------------------------|
| 36MB | 7 & 8 |
|---------------+--------------------------------------------|
| 40MB | 1 & 2, 7 & 8 |
|---------------+--------------------------------------------|
| 44MB | 3 & 4, 7 & 8 |
|---------------+--------------------------------------------|
| 48MB | 1 & 2, 3 & 4, 7 & 8 |
|---------------+--------------------------------------------|
| 52MB | 5 & 6, 7 & 8 |
|---------------+--------------------------------------------|
| 56MB | 1 & 2, 5 & 6, 7 & 8 |
|---------------+--------------------------------------------|
| 60MB | 3 & 4, 5 & 6, 7 & 8 |
|---------------+--------------------------------------------|
| 64MB | 1 & 2, 3 & 4, 5 & 6, 7 & 8 |
|---------------+--------------------------------------------|
| 68MB | 9 & 10 |
|---------------+--------------------------------------------|
| 72MB | 1 & 2, 9 & 10 |
|---------------+--------------------------------------------|
| 76MB | 3 & 4, 9 & 10 |
|---------------+--------------------------------------------|
| 80MB | 1 & 2, 3 & 4, 9 & 10 |
|---------------+--------------------------------------------|
| 84MB | 5 & 6, 9 & 10 |
|---------------+--------------------------------------------|
| 88MB | 1 & 2, 5 & 6, 9 & 10 |
|---------------+--------------------------------------------|
| 92MB | 3 & 4, 5 & 6, 9 & 10 |
|---------------+--------------------------------------------|
| 96MB | 1 & 2, 3 & 4, 5 & 6, 9 & 10 |
|---------------+--------------------------------------------|
| 100MB | 7 & 8, 9 & 10 |
|---------------+--------------------------------------------|
| 104MB | 1 & 2, 7 & 8, 9 & 10 |
|---------------+--------------------------------------------|
| 108MB | 3 & 4, 7 & 8, 9 & 10 |
|---------------+--------------------------------------------|
| 112MB | 1 & 2, 3 & 4, 7 & 8, 9 & 10 |
|---------------+--------------------------------------------|
| 116MB | 5 & 6, 7 & 8, 9 & 10 |
|---------------+--------------------------------------------|
| 120MB | 1 & 2, 5 & 6, 7 & 8, 9 & 10 |
|---------------+--------------------------------------------|
| 124MB | 3 & 4, 5 & 6, 7 & 8, 9 & 10 |
|---------------+--------------------------------------------|
| 128MB | 1 & 2, 3 & 4, 5 & 6, 7 & 8, 9 & 10 |
|------------------------------------------------------------|
| Note: If this memory board is used with an AM-175 CPU |
| board (AM-1500 series), W8 must be set as follows: |
| Pins 11 & 12, 13 & 14, 15 & 16 closed. If the AM-1500 |
| is used, only 16MB are available. Any memory above |
| 16MB will be automatically disabled. Before this |
| board can be installed in an AM-1500, a 4MB memory |
| board must be installed. Pins designated should be in |
| the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| TIMING DETECTION SELECTION |
|------------------------------------------------------------|
| CPU board used | W7 |
|----------------------------+-------------------------------|
| AM-175 | Pins 2 & 4 closed |
|----------------------------+-------------------------------|
| AM-180 | Pins 2 & 4 closed |
|----------------------------+-------------------------------|
| AM-185 | Open |
|----------------------------+-------------------------------|
| AM-185 (50) | Pins 1 & 3, 2 & 4 closed |
+------------------------------------------------------------+