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# TANDY/RADIO SHACK
MFP/420s
Processor 80486SX/80487SX
Processor Speed 20MHz
Chip Set Tandy
Max. Onboard DRAM 32MB
Cache None
BIOS Phoenix/Grid
Dimensions 355mm x 304mm
I/O Options Bus mouse port, floppy drive interface, IDE
interface
parallel port, serial port (2), VGA feature
connector, VGA port
NPU Options 4167
IMG IMG 1
+------------------------------------------------------------+
| VRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | VRAM | Location | SW1/switch 6 |
|------------+---------------+---------------+---------------|
| 512KB | (2) 44256 | Bank 0 | closed |
|------------+---------------+---------------+---------------|
| 1024KB | (2) 44256 | Banks 0 & 1 | open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Purpose | Location | Purpose | Location |
|------------------+----------+-------------------+----------|
| External battery | BAT | Floppy drive | C6 |
| | | interface | |
|------------------+----------+-------------------+----------|
| Board LED | BLED | IDE interface | C7 |
|------------------+----------+-------------------+----------|
| VGA port | C1 | Power LED | PLED |
|------------------+----------+-------------------+----------|
| Bus mouse port | C2 | Reset switch | RES |
|------------------+----------+-------------------+----------|
| Parallel port | C3 | Speaker | SPK |
|------------------+----------+-------------------+----------|
| Serial port 2 | C4 | Riser card | S1 |
|------------------+----------+-------------------+----------|
| Serial port 1 | C5 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Function | Switch | Position |
|------------------------------------+------------+----------|
| » | On-board Video System enabled | SW1/switch | closed |
| | | 7 | |
| | | | open |
| | | SW1/switch | |
| | | 8 | |
|---+--------------------------------+------------+----------|
| | On-board Video System disabled | SW1/switch | open |
| | | 7 | |
| | | | closed |
| | | SW1/switch | |
| | | 8 | |
|---+--------------------------------+------------+----------|
| » | Factory configured - do not | SW2/switch | open |
| | alter | 1 | |
|---+--------------------------------+------------+----------|
| » | Factory configured - do not | SW2/switch | open |
| | alter | 2 | |
|---+--------------------------------+------------+----------|
| » | Monitor type select color | SW2/switch | open |
| | | 3 | |
|---+--------------------------------+------------+----------|
| | Monitor type select monochrome | SW2/switch | closed |
| | | 3 | |
|---+--------------------------------+------------+----------|
| » | Factory configured - do not | SW2/switch | open |
| | alter | 4 | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| VIDEO SWITCH CONFIGURATION (SW1) |
|------------------------------------------------------------|
| Mode |switch 1|switch 2|switch 3|switch 4|switch |
| | | | | | 5 |
|----------------+--------+--------+--------+--------+-------|
| 56Hz vertical | open | open | N/A | N/A | N/A |
| refresh 1 | | | | | |
|----------------+--------+--------+--------+--------+-------|
| 60Hz vertical | open | closed | N/A | N/A | N/A |
| refresh 1 | | | | | |
|----------------+--------+--------+--------+--------+-------|
| 72Hz vertical | closed | open | N/A | N/A | N/A |
| refresh 1 | | | | | |
|----------------+--------+--------+--------+--------+-------|
| Enable | N/A | N/A | open | open | N/A |
| interlaced 2 | | | | | |
|----------------+--------+--------+--------+--------+-------|
| 60Hz | N/A | N/A | open | closed | N/A |
|non-interlaced 2| | | | | |
|----------------+--------+--------+--------+--------+-------|
| 72Hz | N/A | N/A | closed | open | N/A |
|non-interlaced 2| | | | | |
|----------------+--------+--------+--------+--------+-------|
| 31.5KHz | N/A | N/A | N/A | N/A | open |
|horizontal scan | | | | | |
| rate 3 | | | | | |
|----------------+--------+--------+--------+--------+-------|
|40KHz horizontal| N/A | N/A | N/A | N/A |closed |
| scan rate 3 | | | | | |
|------------------------------------------------------------|
|Note 1 :When monitor resolution is 800 x 600. |
| |
|Note 2 :When monitor resolution is 1024 x 768. |
| |
|Note 3 :When monitor resolution is 640 x 480 or below. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DRAM CONFIGURATION |
|------------------------------------------------------------|
| Size | Bank 0 | Bank 1 |
|------------------+--------------------+--------------------|
| 4MB | (4) 1M x 9 | NONE |
|------------------+--------------------+--------------------|
| 5MB | (4) 1M x 9 | (4) 256K x 9 |
|------------------+--------------------+--------------------|
| 8MB | (4) 1M x 9 | (4) 1M x 9 |
|------------------+--------------------+--------------------|
| 16MB | (4) 4M x 9 | NONE |
|------------------+--------------------+--------------------|
| 17MB | (4) 256K x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 20MB | (4) 1M x 9 | (4) 4M x 9 |
|------------------+--------------------+--------------------|
| 32MB | (4) 4M x 9 | (4) 4M x 9 |
+------------------------------------------------------------+