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# TANDY/RADIO SHACK
3100, MMPC MODEL 10/20
SENSATION! (250-1651)
Processor 80486SX/80487SX/ODP486/80486DX2
Processor Speed 25/33/50(internal)/66(internal)MHz
Chip Set Unidentified
Video Chip Set Unidentified
Maximum Onboard 64MB
Memory
Maximum Video 1MB
Memory
Cache None
BIOS Unidentified
Dimensions 254mm x 218mm
I/O Options Floppy drive interface, IDE interface,
parallel port, PS/2 mouse port, serial ports
(2), VGA feature connector, VGA port, riser
slot
NPU Options None
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|-----------------+----------+--------------------+----------|
| VGA port | CN1 | IDE interface | CN6 |
|-----------------+----------+--------------------+----------|
| Parallel port | CN2 | Floppy drive | CN7 |
| | | interface | |
|-----------------+----------+--------------------+----------|
| Serial port 2 | CN3 | VGA feature | CN8 |
| | | connector | |
|-----------------+----------+--------------------+----------|
| Serial port 1 | CN4 | Riser slot | SL1 |
|-----------------+----------+--------------------+----------|
| PS/2 mouse port | CN5 | IDE interface LED | W2 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Label | Position |
|-----------------------------------+-------+----------------|
| | Parallel port IRQ select IRQ7 | W5 | Pins 1 & 2 |
| | | | closed |
|---+-------------------------------+-------+----------------|
| | Parallel port IRQ select IRQ5 | W5 | Pins 2 & 3 |
| | | | closed |
|---+-------------------------------+-------+----------------|
| | Parallel port IRQ disabled | W5 | Open |
|---+-------------------------------+-------+----------------|
| » | On board video enabled | W8 | Pins 2 & 3 |
| | | | closed |
|---+-------------------------------+-------+----------------|
| | On board video disabled | W8 | Pins 1 & 2 |
| | | | closed |
|---+-------------------------------+-------+----------------|
| » | VGA IRQ disabled | W9 | Open |
|---+-------------------------------+-------+----------------|
| | VGA IRQ enabled | W9 | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 4MB | (1) 1M x 32 | None | None | None |
|------+-------------+-------------+------------+------------|
| 5MB | (1) 1M x 32 | (1) 256K x | None | None |
| | | 32 | | |
|------+-------------+-------------+------------+------------|
| 6MB | (1) 1M x 32 | (1) 256K x | (1) 256K x | None |
| | | 32 | 32 | |
|------+-------------+-------------+------------+------------|
| 6MB | (1) 1M x 32 | (1) 512K x | None | None |
| | | 32 | | |
|------+-------------+-------------+------------+------------|
| 7MB | (1) 1M x 32 | (1) 256K x | (1) 256K x | (1) 256K x |
| | | 32 | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 7MB | (1) 1M x 32 | (1) 512K x | (1) 256K x | None |
| | | 32 | 32 | |
|------+-------------+-------------+------------+------------|
| 8MB | (1) 1M x 32 | (1) 512K x | (1) 256K x | (1) 256K x |
| | | 32 | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 8MB | (1) 1M x 32 | None | (1) 512K x | (1) 512K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 8MB | (1) 1M x 32 | (1) 1M x 32 | None | None |
|------+-------------+-------------+------------+------------|
| 8MB | (1) 2M x 32 | None | None | None |
|------+-------------+-------------+------------+------------|
| 9MB | (1) 1M x 32 | (1) 256K x | (1) 512K x | (1) 512K x |
| | | 32 | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 9MB | (1) 1M x 32 | (1) 1M x 32 | (1) 256K x | None |
| | | | 32 | |
|------+-------------+-------------+------------+------------|
| 9MB | (1) 2M x 32 | (1) 256K x | None | None |
| | | 32 | | |
|------+-------------+-------------+------------+------------|
| 10MB | (1) 1M x 32 | (1) 512K x | (1) 512K x | (1) 512K x |
| | | 32 | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 10MB | (1) 1M x 32 | (1) 1M x 32 | (1) 256K x | (1) 256K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 10MB | (1) 1M x 32 | (1) 1M x 32 | (1) 512K x | None |
| | | | 32 | |
|------+-------------+-------------+------------+------------|
| 10MB | (1) 2M x 32 | None | (1) 256K x | (1) 256K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 10MB | (1) 2M x 32 | (1) 512K x | None | None |
| | | 32 | | |
|------+-------------+-------------+------------+------------|
| 11MB | (1) 1M x 32 | (1) 1M x 32 | (1) 512K x | (1) 256K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 11MB | (1) 2M x 32 | (1) 256K x | (1) 256K x | (1) 256K x |
| | | 32 | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 11MB | (1) 2M x 32 | (1) 512K x | (1) 256K x | None |
| | | 32 | 32 | |
|------+-------------+-------------+------------+------------|
| 12MB | (1) 1M x 32 | (1) 1M x 32 | (1) 512K x | (1) 512K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 12MB | (1) 1M x 32 | (1) 1M x 32 | (1) 1M x | None |
| | | | 32 | |
|------+-------------+-------------+------------+------------|
| 12MB | (1) 2M x 32 | (1) 512K x | (1) 256K x | (1) 256K x |
| | | 32 | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 12MB | (1) 2M x 32 | None | (1) 512K x | (1) 512K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 12MB | (1) 2M x 32 | (1) 1M x 32 | None | None |
|------+-------------+-------------+------------+------------|
| 13MB | (1) 1M x 32 | (1) 1M x 32 | (1) 1M x | (1) 256K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 13MB | (1) 2M x 32 | (1) 256K x | (1) 512K x | (1) 512K x |
| | | 32 | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 13MB | (1) 2M x 32 | (1) 1M x 32 | (1) 256K x | None |
| | | | 32 | |
|------+-------------+-------------+------------+------------|
| 14MB | (1) 1M x 32 | (1) 1M x 32 | (1) 1M x | (1) 512K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 14MB | (1) 2M x 32 | (1) 512K x | (1) 512K x | (1) 512K x |
| | | 32 | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 14MB | (1) 2M x 32 | (1) 1M x 32 | (1) 256K x | (1) 256K x |
| | | | 32 | 32 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 14MB | (1) 2M x 32 | (1) 1M x 32 | (1) 512K x | None |
| | | | 32 | |
|------+-------------+-------------+------------+------------|
| 15MB | (1) 2M x 32 | (1) 1M x 32 | (1) 512K x | (1) 256K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 1M x 32 | (1) 1M x 32 | (1) 1M x | (1) 1M x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 2M x 32 | (1) 1M x 32 | (1) 512K x | (1) 512K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 2M x 32 | None | (1) 1M x | (1) 1M x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 2M x 32 | (1) 2M x 32 | None | None |
|------+-------------+-------------+------------+------------|
| 16MB | (1) 4M x 32 | None | None | None |
|------+-------------+-------------+------------+------------|
| 17MB | (1) 2M x 32 | (1) 256K x | (1) 1M x | (1) 1M x |
| | | 32 | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 17MB | (1) 2M x 32 | (1) 2M x 32 | (1) 256K x | None |
| | | | 32 | |
|------+-------------+-------------+------------+------------|
| 17MB | (1) 4M x 32 | (1) 256K x | None | None |
| | | 32 | | |
|------+-------------+-------------+------------+------------|
| 18MB | (1) 2M x 32 | (1) 512K x | (1) 1M x | (1) 1M x |
| | | 32 | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 18MB | (1) 2M x 32 | (1) 2M x 32 | (1) 256K x | (1) 256K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 18MB | (1) 2M x 32 | (1) 2M x 32 | (1) 512K x | None |
| | | | 32 | |
|------+-------------+-------------+------------+------------|
| 18MB | (1) 4M x 32 | (1) 256K x | (1) 256K x | None |
| | | 32 | 32 | |
|------+-------------+-------------+------------+------------|
| 18MB | (1) 4M x 32 | (1) 512K x | None | None |
| | | 32 | | |
|------+-------------+-------------+------------+------------|
| 19MB | (1) 2M x 32 | (1) 2M x 32 | (1) 512K x | (1) 256K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 19MB | (1) 4M x 32 | (1) 256K x | (1) 256K x | (1) 256K x |
| | | 32 | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 19MB | (1) 4M x 32 | (1) 512K x | (1) 256K x | None |
| | | 32 | 32 | |
|------+-------------+-------------+------------+------------|
| 20MB | (1) 2M x 32 | (1) 1M x 32 | (1) 1M x | (1) 1M x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 20MB | (1) 2M x 32 | (1) 2M x 32 | (1) 512K x | (1) 512K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 20MB | (1) 2M x 32 | (1) 2M x 32 | (1) 1M x | None |
| | | | 32 | |
|------+-------------+-------------+------------+------------|
| 20MB | (1) 4M x 32 | (1) 512K x | (1) 256K x | (1) 256K x |
| | | 32 | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 20MB | (1) 4M x 32 | None | (1) 512K x | (1) 512K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 20MB | (1) 4M x 32 | (1) 1M x 32 | None | None |
|------+-------------+-------------+------------+------------|
| 21MB | (1) 2M x 32 | (1) 2M x 32 | (1) 1M x | (1) 256K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 21MB | (1) 4M x 32 | (1) 256K x | (1) 512K x | (1) 512K x |
| | | 32 | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 21MB | (1) 4M x 32 | (1) 1M x 32 | (1) 256K x | None |
| | | | 32 | |
|------+-------------+-------------+------------+------------|
| 22MB | (1) 2M x 32 | (1) 2M x 32 | (1) 1M x | (1) 512K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 22MB | (1) 4M x 32 | (1) 512K x | (1) 512K x | (1) 512K x |
| | | 32 | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 22MB | (1) 4M x 32 | (1) 1M x 32 | (1) 256K x | (1) 256K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 22MB | (1) 4M x 32 | (1) 1M x 32 | (1) 512K x | None |
| | | | 32 | |
|------+-------------+-------------+------------+------------|
| 23MB | (1) 4M x 32 | (1) 1M x 32 | (1) 512K x | (1) 256K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 24MB | (1) 2M x 32 | (1) 2M x 32 | (1) 1M x | (1) 1M x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 24MB | (1) 2M x 32 | (1) 2M x 32 | (1) 2M x | None |
| | | | 32 | |
|------+-------------+-------------+------------+------------|
| 24MB | (1) 4M x 32 | (1) 1M x 32 | (1) 512K x | (1) 512K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 24MB | (1) 4M x 32 | (1) 1M x 32 | (1) 1M x | None |
| | | | 32 | |
|------+-------------+-------------+------------+------------|
| 24MB | (1) 4M x 32 | (1) 2M x 32 | None | None |
|------+-------------+-------------+------------+------------|
| 25MB | (1) 2M x 32 | (1) 2M x 32 | (1) 2M x | (1) 256K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 25MB | (1) 4M x 32 | (1) 1M x 32 | (1) 1M x | (1) 256K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 25MB | (1) 4M x 32 | (1) 2M x 32 | (1) 256K x | None |
| | | | 32 | |
|------+-------------+-------------+------------+------------|
| 26MB | (1) 2M x 32 | (1) 2M x 32 | (1) 2M x | (1) 512K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 26MB | (1) 4M x 32 | (1) 1M x 32 | (1) 1M x | (1) 512K x |
| | | | 32 | 32 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION (CON’T) |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 | Bank 2 | Bank 3 |
|------+-------------+-------------+------------+------------|
| 26MB | (1) 4M x 32 | (1) 2M x 32 | (1) 256K x | (1) 256K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 26MB | (1) 4M x 32 | (1) 2M x 32 | (1) 512K x | None |
| | | | 32 | |
|------+-------------+-------------+------------+------------|
| 27MB | (1) 4M x 32 | (1) 2M x 32 | (1) 512K x | (1) 256K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 28MB | (1) 2M x 32 | (1) 2M x 32 | (1) 2M x | (1) 1M x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 28MB | (1) 4M x 32 | (1) 1M x 32 | (1) 1M x | (1) 1M x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 28MB | (1) 4M x 32 | (1) 2M x 32 | (1) 512K x | (1) 512K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 28MB | (1) 4M x 32 | (1) 2M x 32 | (1) 1M x | None |
| | | | 32 | |
|------+-------------+-------------+------------+------------|
| 29MB | (1) 4M x 32 | (1) 2M x 32 | (1) 1M x | (1) 256K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 30MB | (1) 4M x 32 | (1) 2M x 32 | (1) 1M x | (1) 512K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 32MB | (1) 2M x 32 | (1) 2M x 32 | (1) 2M x | (1) 2M x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 32MB | (1) 4M x 32 | (1) 2M x 32 | (1) 1M x | (1) 1M x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 32MB | (1) 4M x 32 | None | (1) 2M x | (1) 2M x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 32MB | (1) 4M x 32 | (1) 4M x 32 | None | None |
|------+-------------+-------------+------------+------------|
| 33MB | (1) 4M x 32 | (1) 256K x | (1) 2M x | (1) 2M x |
| | | 32 | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 33MB | (1) 4M x 32 | (1) 4M x 32 | (1) 256K x | None |
| | | | 32 | |
|------+-------------+-------------+------------+------------|
| 34MB | (1) 4M x 32 | (1) 512K x | (1) 2M x | (1) 2M x |
| | | 32 | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 34MB | (1) 4M x 32 | (1) 4M x 32 | (1) 256K x | (1) 256K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 34MB | (1) 4M x 32 | (1) 4M x 32 | (1) 512K x | None |
| | | | 32 | |
|------+-------------+-------------+------------+------------|
| 35MB | (1) 4M x 32 | (1) 4M x 32 | (1) 512K x | (1) 256K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 36MB | (1) 4M x 32 | (1) 1M x 32 | (1) 2M x | (1) 2M x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 36MB | (1) 4M x 32 | (1) 4M x 32 | (1) 512K x | (1) 512K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 36MB | (1) 4M x 32 | (1) 4M x 32 | (1) 1M x | None |
| | | | 32 | |
|------+-------------+-------------+------------+------------|
| 37MB | (1) 4M x 32 | (1) 4M x 32 | (1) 1M x | (1) 256K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 38MB | (1) 4M x 32 | (1) 4M x 32 | (1) 1M x | (1) 512K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 40MB | (1) 4M x 32 | (1) 2M x 32 | (1) 2M x | (1) 2M x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 40MB | (1) 4M x 32 | (1) 4M x 32 | (1) 1M x | (1) 1M x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 40MB | (1) 4M x 32 | (1) 4M x 32 | (1) 2M x | None |
| | | | 32 | |
|------+-------------+-------------+------------+------------|
| 41MB | (1) 4M x 32 | (1) 4M x 32 | (1) 2M x | (1) 256K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 42MB | (1) 4M x 32 | (1) 4M x 32 | (1) 2M x | (1) 512K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 44MB | (1) 4M x 32 | (1) 4M x 32 | (1) 2M x | (1) 1M x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 48MB | (1) 4M x 32 | (1) 4M x 32 | (1) 2M x | (1) 2M x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 48MB | (1) 4M x 32 | (1) 4M x 32 | (1) 4M x | None |
| | | | 32 | |
|------+-------------+-------------+------------+------------|
| 49MB | (1) 4M x 32 | (1) 4M x 32 | (1) 4M x | (1) 256K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 50MB | (1) 4M x 32 | (1) 4M x 32 | (1) 4M x | (1) 512K x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 52MB | (1) 4M x 32 | (1) 4M x 32 | (1) 4M x | (1) 1M x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 56MB | (1) 4M x 32 | (1) 4M x 32 | (1) 4M x | (1) 2M x |
| | | | 32 | 32 |
|------+-------------+-------------+------------+------------|
| 64MB | (1) 4M x 32 | (1) 4M x 32 | (1) 4M x | (1) 4M x |
| | | | 32 | 32 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VIDEO MEMORY CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|--------------------+-------------------+-------------------|
| 512KB | 512KB | None |
|--------------------+-------------------+-------------------|
| 1MB | 512KB | 512KB |
|------------------------------------------------------------|
| Note: The size of the video memory chips are unidentified. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU SPEED SELECTION |
|------------------------------------------------------------|
| Speed | W1 |
|------------------------------+-----------------------------|
| 25MHz | Closed |
|------------------------------+-----------------------------|
| 33MHz | Open |
|------------------------------+-----------------------------|
| 50iMHz | Closed |
|------------------------------+-----------------------------|
| 66iMHz | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CPU TYPE SELECTION |
|------------------------------------------------------------|
| Type | W6 | W7 |
|------------------+--------------------+--------------------|
| 80486SX | Pins 2 & 3 closed | Pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 80487SX | Pins 1 & 2 closed | Pins 2 & 3 closed |
|------------------+--------------------+--------------------|
| ODP486 | Pins 1 & 2 closed | Pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 80486DX | Pins 1 & 2 closed | Pins 1 & 2 closed |
|------------------+--------------------+--------------------|
| 80486DX2 | Pins 1 & 2 closed | Pins 1 & 2 closed |
|------------------------------------------------------------|
| Note: W7 may not be present on all boards. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT 1 ADDRESS SELECTION |
|------------------------------------------------------------|
| Setting | IRQ | W3 |
|-----------------------+---------------+--------------------|
| » | COM1/COM3 | IRQ4 | Pins 1 & 2 closed |
|---+-------------------+---------------+--------------------|
| | COM3 | IRQ11 | Pins 2 & 3 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT 2 ADDRESS SELECTION |
|------------------------------------------------------------|
| Setting | IRQ | W4 |
|------------------------+--------------+--------------------|
| » | COM2/COM4 (2F8h) | IRQ3 | Pins 1 & 2 closed |
|---+--------------------+--------------+--------------------|
| | COM4 | IRQ10 | Pins 2 & 3 closed |
+------------------------------------------------------------+