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# MONOLITHIC SYSTEMS, INC. (COLORADO MSI)
MICROFRAME 486M
Processor 80486DX
Processor Speed 25MHz
Chip Set C & T
Max. Onboard DRAM 8MB
Cache None
BIOS Quadtel
Dimensions 330.2mm x 221mm
I/O Options 32-bit external memory card slot
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|--------------------+----------+-----------------+----------|
| External battery | J1 | Turbo LED | J10 |
|--------------------+----------+-----------------+----------|
| Drive active LED | J3 | CPU ready LED | J11 |
|--------------------+----------+-----------------+----------|
| Front panel ribbon | J6 | Speaker | J19 |
| cable | | | |
|--------------------+----------+-----------------+----------|
| Reset switch | J7 | Power LED & | J40 |
| | | keylock | |
|--------------------+----------+-----------------+----------|
| Auxiliary keyboard | J8 | 32-bit external | S1 |
| | | memory card | |
|------------------------------------------------------------|
| Note:If the front panel Drive LED is to be used, the drive |
| active signal from the drive or drive controller |
| |
| must be connected to J3/pins 1 & 2 or J3/pins 2 & 3. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Jumper | Position |
|--------------------------------------+--------+------------|
| » | CMOS memory normal operation | J2 | Open |
|---+----------------------------------+--------+------------|
| | CMOS memory clear | J2 | Closed |
|---+----------------------------------+--------+------------|
| » | DMA active signal select high | J12 | Closed |
|---+----------------------------------+--------+------------|
| | DMA active signal select low | J12 | Open |
|---+----------------------------------+--------+------------|
| » | NPU parity check enabled | J13 | Closed |
|---+----------------------------------+--------+------------|
| | NPU parity check disabled | J13 | Open |
|---+----------------------------------+--------+------------|
| » | Internal CPU cache enabled | J16 | Closed |
|---+----------------------------------+--------+------------|
| | Internal CPU cache disabled | J16 | Open |
|---+----------------------------------+--------+------------|
| » | NPU zero wait state enabled | J17 | Closed |
|---+----------------------------------+--------+------------|
| | NPU zero wait state disabled | J17 | Open |
|---+----------------------------------+--------+------------|
| » | Internal CPU caching of BIOS | J18 | pins 1 & 2 |
| | disabled | | open |
|---+----------------------------------+--------+------------|
| | Internal CPU caching of BIOS | J18 | pins 1 & 2 |
| | enabled | | closed |
|---+----------------------------------+--------+------------|
| | Í Factory test jumper- do not | J24 | Closed |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | POST enabled | J25 | Closed |
|---+----------------------------------+--------+------------|
| | POST disabled | J25 | Open |
|---+----------------------------------+--------+------------|
| » | Factory test jumper - do not | J26 | Closed |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | NPU disabled | J33 | Open |
|---+----------------------------------+--------+------------|
| | NPU enabled | J33 | Closed |
|---+----------------------------------+--------+------------|
| » | Factory test jumper - do not | J34 | Closed |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory test jumper - do not | J35 | Closed |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Factory test jumper - do not | J36 | Closed |
| | alter | | |
|---+----------------------------------+--------+------------|
| » | Monitor type select color | J39 | pins 2 & 3 |
| | | | closed |
|---+----------------------------------+--------+------------|
| | Monitor type select monochrome | J39 | pins 1 & 2 |
| | | | closed |
|------------------------------------------------------------|
| Note:Locations of J18, J34, J35, & J36 are unknown. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 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 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| J6 - RIBBON CABLE CONNECTOR |
| |
| PIN ASSIGNMENTS |
|------------------------------------------------------------|
IMG IMG 2
| |
+------------------------------------------------------------+