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# MYLEX CORPORATION
EM386X
Processor 80386DX
Processor 25/33MHz
Speed
Chip Set Unidentified
Max. Onboard 32MB
DRAM
Cache 16/32/64/128KB
BIOS AMI/Award/Mylex/Phoenix
Dimensions 305mm x 330mm
I/O Options 32-bit Intel slots (2), 32-bit external memory
card
NPU Options 80287/80387DX/3167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|--------------------+----------+-----------------+----------|
| External battery | BAT | Power LED & | J17 |
| | | keylock | |
|--------------------+----------+-----------------+----------|
| Turbo switch | J6 | Reset switch | J18 |
|--------------------+----------+-----------------+----------|
| Single-step | J10 | 32-bit Intel | SL1 & |
| control switch | | slots | SL2 |
|--------------------+----------+-----------------+----------|
| Speaker connector | J14 | 32-bit external | SL3 |
| | | memory card | |
|--------------------+----------+-----------------+----------|
| Turbo LED | J16 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| | I/O bus speed select 1 wait | J1 | Closed |
| | states | | |
|---+----------------------------------+--------+------------|
| | I/O bus speed select 2 wait | J1 | Open |
| | states | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J2 | Closed |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Monitor type select monochrome | J3 | pins 1 & 2 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Monitor type select color | J3 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| » | AT bus DRAM refresh signal | J4 | Closed |
| | disabled | | |
|---+----------------------------------+--------+------------|
| | AT bus DRAM refresh signal | J4 | Open |
| | enabled | | |
|---+----------------------------------+--------+------------|
| » | 80386 <Rev. D NPU interface bug | J5 | Open |
| | bypass disabled | | |
|---+----------------------------------+--------+------------|
| | 80386 <Rev. D NPU interface bug | J5 | Closed |
| | bypass enabled | | |
|---+----------------------------------+--------+------------|
| » | Turbo mode enabled | J6 | Open |
|---+----------------------------------+--------+------------|
| | Turbo mode disabled | J6 | Closed |
|---+----------------------------------+--------+------------|
| » | Cache enabled | J9 | Open |
|---+----------------------------------+--------+------------|
| | Cache disabled | J9 | Closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J11 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J13 | pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J15 | pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J22 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J23 | Closed |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J26 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J27 | Closed |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Memory access on Intel 32-bit | J28 | Closed |
| | bus cached | | |
|---+----------------------------------+--------+------------|
| | Memory access on Intel 32-bit | J28 | Open |
| | bus cached | | |
|---+----------------------------------+--------+------------|
| » | ROM address select 0F0000 and | J30 | Open |
| | FF0000 | | |
|---+----------------------------------+--------+------------|
| | ROM address select 0F0000 | J30 | Closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J33 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | NPU type select 80387 | J34 | Closed |
|---+----------------------------------+--------+------------|
| | NPU type select 80287 | J34 | Open |
|---+----------------------------------+--------+------------|
| » | NPU synchronous with CPU | J35 | Open |
|---+----------------------------------+--------+------------|
| | NPU asynchronous with CPU | J35 | Closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J37 | pins 1 & 2 |
| | alter | | closed |
|---+----------------------------------+--------+------------|
| » | Factory configured - do not | J38 | N/A |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | 80387 reset normal | J40 | Open |
|---+----------------------------------+--------+------------|
| | 80387 reset on port F1h | J40 | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS (CON’T) |
|------------------------------------------------------------|
| Function | Jumper/Switch | Position |
|-------------------------------+---------------+------------|
| » | ROM caching disabled | J41 | Open |
|---+---------------------------+---------------+------------|
| | ROM caching enabled | J41 | Closed |
|---+---------------------------+---------------+------------|
| » | Single step mode disabled | J42 | pins 2 & 3 |
| | | | closed |
|---+---------------------------+---------------+------------|
| | Single step mode enabled | J42 | pins 1 & 2 |
| | | | closed |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | J43 | N/A |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | BIOS speed select 250ns | J44 | pins 3 & 4 |
| | | | closed |
|---+---------------------------+---------------+------------|
| | BIOS speed select 200ns | J44 | pins 1 & 2 |
| | | | closed |
|---+---------------------------+---------------+------------|
| | BIOS speed select 200ns | J44 | Open |
| | for 25MHz machine | | |
|---+---------------------------+---------------+------------|
| | BIOS speed select 150ns | J44 | Open |
| | for 33MHz machine | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | J46 | N/A |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | J47 | N/A |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | J48 | N/A |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | J49 | N/A |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | J50 | N/A |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Intel NPU not installed | SW0/1 | On |
|---+---------------------------+---------------+------------|
| | Intel NPU installed | SW0/1 | Off |
|---+---------------------------+---------------+------------|
| » | No ISA bus card installed | SW0/2 | On |
| | w/memory between 12 and | | |
| | 14MB | | |
|---+---------------------------+---------------+------------|
| | ISA bus card installed | SW0/2 | Off |
| | with memory between 12 | | |
| | and 14MB | | |
|---+---------------------------+---------------+------------|
| | ROM shadowing disabled | SW0/8 | On |
|---+---------------------------+---------------+------------|
| | ROM shadowing enabled | SW0/8 | Off |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | SW0/9 | N/A |
| | not alter | | |
|---+---------------------------+---------------+------------|
| » | Factory configured - do | SW0/10 | N/A |
| | not alter | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | TAG |
|------------+---------------+---------------+---------------|
| 16KB | (8) 4K x 4 | NONE | (>1) 4K x 4 |
|------------+---------------+---------------+---------------|
| 32KB 1 | (8) 4K x 4 | (8) 4K x 4 | (>1) 16K x 4 |
|------------+---------------+---------------+---------------|
| 32KB 2 | (8) 8K x 4 | NONE | (>1) 16K x 4 |
|------------+---------------+---------------+---------------|
| 64KB | (8) 16K x 4 | NONE | (>1) 16K x 4 |
|------------+---------------+---------------+---------------|
| 128KB | (8) 16K x 4 | (8) 16K x 4 | (>1) 16K x 4 |
|------------------------------------------------------------|
| Note: The exact location and number of tag chips is |
| unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION |
|------------------------------------------------------------|
| Size | J7 | J8 | J12 | J29 | J31 |
|-------+----------+----------+----------+--------+----------|
| 16KB | pins 5 & | pins 3 & | pins 5 & | Open | pins 1 & |
| | 6 closed | 4 closed | 6 closed | | 2 closed |
|-------+----------+----------+----------+--------+----------|
| 32KB | pins 5 & | pins 5 & | pins 5 & | Closed | pins 5 & |
| 1 | 6 closed | 6 closed | 6 closed | | 6 closed |
|-------+----------+----------+----------+--------+----------|
| 32KB | pins 5 & | pins 5 & | pins 5 & | Open | pins 1 & |
| 2 | 6 closed | 6 closed | 6 closed | | 2 closed |
|-------+----------+----------+----------+--------+----------|
| 64KB | pins 5 & | pins 5 & | pins 3 & | Open | pins 1 & |
| | 6 closed | 6 closed | 4 closed | | 2 closed |
|-------+----------+----------+----------+--------+----------|
| 128KB | pins 3 & | pins 5 & | pins 3 & | Closed | pins 3 & |
| | 4 closed | 6 closed | 4 closed | | 4 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHE JUMPER CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | J36 | J39 | J51 | J52 |
|--------+------------+------------+------------+------------|
| 16KB | pins 2 & 3 | pins 5 & 6 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 32KB 1 | pins 2 & 3 | pins 7 & 8 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 32KB 2 | pins 2 & 3 | pins 5 & 6 | pins 2 & 3 | pins 2 & 3 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 64KB | pins 1 & 2 | pins 5 & 6 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed | closed |
|--------+------------+------------+------------+------------|
| 128KB | pins 1 & 2 | pins 3 & 4 | pins 1 & 2 | pins 1 & 2 |
| | closed | closed | closed | closed |
+------------------------------------------------------------+
IMG IMG 2
IMG IMG 3
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 1MB | (4) 256K x 9 | NONE |
|------------------+--------------------+--------------------|
| 2MB | (4) 256K x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 4MB | (4) 1M x 9 | NONE |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM SWITCH CONFIGURATION |
|------------------------------------------------------------|
| Size | EMS Size | SW1/1 | SW1/2 | SW1/3 | SW1/4 |
|---------+----------+---------+---------+---------+---------|
| 1MB | NONE | On | On | On | On |
|---------+----------+---------+---------+---------+---------|
| 1MB | 0.375MB | Off | On | On | On |
|---------+----------+---------+---------+---------+---------|
| 2MB | 1MB | On | On | Off | On |
|---------+----------+---------+---------+---------+---------|
| 2MB | 1.375MB | Off | On | Off | On |
|---------+----------+---------+---------+---------+---------|
| 4MB | 3MB | On | On | Off | Off |
|---------+----------+---------+---------+---------+---------|
| 4MB | 3.375MB | Off | On | Off | Off |
|---------+----------+---------+---------+---------+---------|
| 8MB | 7MB | Off | On | Off | Off |
|---------+----------+---------+---------+---------+---------|
| 8MB | 7.375MB | On | Off | On | On |
|---------+----------+---------+---------+---------+---------|
| 16MB | 13MB | On | Off | On | Off |
|---------+----------+---------+---------+---------+---------|
| 16MB | 14.875MB | On | Off | Off | On |
|---------+----------+---------+---------+---------+---------|
| 32MB | 30.875MB | On | Off | Off | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM SPEED CONFIGURATION |
|------------------------------------------------------------|
| CPU Speed | DRAM | J25 | SW0/5 | SW0/6 | SW0/7 |
| | Speed | | | | |
|-----------+--------+---------------+-------+-------+-------|
| 25MHz | 80ns | pins 1 & 2 | On | On | On |
| | | closed | | | |
|-----------+--------+---------------+-------+-------+-------|
| 25MHz | 100ns | pins 3 & 4 | Off | Off | Off |
| | | closed | | | |
|-----------+--------+---------------+-------+-------+-------|
| 33MHz | 60ns | pins 1 & 2 | On | On | On |
| | | closed | | | |
|-----------+--------+---------------+-------+-------+-------|
| 33MHz | 80ns | pins 3 & 4 | Off | Off | Off |
| | | closed | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIOS TYPE CONFIGURATION |
|------------------------------------------------------------|
| » Type | J21 | J24 |
|------------------+--------------------+--------------------|
| » | 27256 | pins 1 & 2 closed | pins 2 & 3 closed |
|---+--------------+--------------------+--------------------|
| » | 27128 | pins 1 & 2 closed | pins 1 & 2 closed |
|---+--------------+--------------------+--------------------|
| » | 27512 | pins 2 & 3 closed | pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CACHEABLE AREA SELECTION |
|------------------------------------------------------------|
| Cacheable RAM | Min. cache size | SW0/2 | SW0/3 | SW0/4 |
|---------------+-----------------+--------+--------+--------|
| 32MB | 128KB | N/A | Off | Off |
|---------------+-----------------+--------+--------+--------|
| 16MB | 64KB | N/A | On | Off |
|---------------+-----------------+--------+--------+--------|
| 14MB | 128KB | Off | Off | On |
|---------------+-----------------+--------+--------+--------|
| 8MB | 128KB | On | Off | On |
|---------------+-----------------+--------+--------+--------|
| 4MB | N/A | N/A | On | On |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM/CACHE MODE CONFIGURATION |
|------------------------------------------------------------|
| DRAM | Interleave | Cache | J19 | J20 | J1/M | J2/M |
| size | | size | | | | |
|-------+------------+--------+-------+-------+-------+------|
| 1MB | No | Any | Open | 2 & 3 | 1 & 2 | 1 & |
| | | | | | | 2 |
|-------+------------+--------+-------+-------+-------+------|
| 2MB | No | Any | 3 & 4 | Open | 1 & 2 | 1 & |
| | | | | | | 2 |
|-------+------------+--------+-------+-------+-------+------|
| 2MB | Yes | 16KB | Open | 1 & 2 | 1 & 2 | 3 & |
| | | | | | | 4 |
|-------+------------+--------+-------+-------+-------+------|
| 2MB | Yes | 32KB 1 | 1 & 2 | Open | 3 & 4 | 1 & |
| | | | | | | 2 |
|-------+------------+--------+-------+-------+-------+------|
| 2MB | Yes | 32KB 2 | Open | 1 & 2 | 1 & 2 | 3 & |
| | | | | | | 4 |
|-------+------------+--------+-------+-------+-------+------|
| 2MB | Yes | 64KB | Open | 1 & 2 | 1 & 2 | 3 & |
| | | | | | | 4 |
|-------+------------+--------+-------+-------+-------+------|
| 2MB | Yes | 128KB | 1 & 2 | Open | 3 & 4 | 1 & |
| | | | | | | 2 |
|-------+------------+--------+-------+-------+-------+------|
| 4MB | No | Any | Open | 2 & 3 | 1 & 2 | 1 & |
| | | | | | | 2 |
|-------+------------+--------+-------+-------+-------+------|
| 8MB | No | Any | 5 & 6 | Open | 1 & 2 | 1 & |
| | | | | | | 2 |
|-------+------------+--------+-------+-------+-------+------|
| 8MB | Yes | 16KB | Open | 1 & 2 | 1 & 2 | 5 & |
| | | | | | | 6 |
|-------+------------+--------+-------+-------+-------+------|
| 8MB | Yes | 32KB 1 | 1 & 2 | Open | 5 & 6 | 1 & |
| | | | | | | 2 |
|-------+------------+--------+-------+-------+-------+------|
| 8MB | Yes | 32KB 2 | Open | 1 & 2 | 1 & 2 | 5 & |
| | | | | | | 6 |
|-------+------------+--------+-------+-------+-------+------|
| 8MB | Yes | 64KB | Open | 1 & 2 | 1 & 2 | 5 & |
| | | | | | | 6 |
|-------+------------+--------+-------+-------+-------+------|
| 8MB | Yes | 128KB | 1 & 2 | Open | 5 & 6 | 1 & |
| | | | | | | 2 |
|-------+------------+--------+-------+-------+-------+------|
| 16MB | No | Any | Open | 2 & 3 | 1 & 2 | 1 & |
| | | | | | | 2 |
|-------+------------+--------+-------+-------+-------+------|
| 32MB | No | Any | 7 & 8 | Open | 1 & 2 | 1 & |
| | | | | | | 2 |
|-------+------------+--------+-------+-------+-------+------|
| 32MB | Yes | 16KB | Open | 1 & 2 | 1 & 2 | 7 & |
| | | | | | | 8 |
|-------+------------+--------+-------+-------+-------+------|
| 32MB | Yes | 32KB 1 | 1 & 2 | Open | 7 & 8 | 1 & |
| | | | | | | 2 |
|-------+------------+--------+-------+-------+-------+------|
| 32MB | Yes | 32KB 2 | Open | 1 & 2 | 1 & 2 | 7 & |
| | | | | | | 8 |
|-------+------------+--------+-------+-------+-------+------|
| 32MB | Yes | 64KB | Open | 1 & 2 | 1 & 2 | 7 & |
| | | | | | | 8 |
|-------+------------+--------+-------+-------+-------+------|
| 32MB | Yes | 128KB | 1 & 2 | Open | 7 & 8 | 1 & |
| | | | | | | 2 |
|------------------------------------------------------------|
| Note: Pins designated should be in the closed position. |
+------------------------------------------------------------+