Texas Micro N286
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Texas Micro N286
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| Bus type | ISA |
|---|---|
| Bus width | 16-bit |
| Bus speed | 10 MHz |
| 8-bit ISA compatible? | Yes |
| Manufacturer | Texas Microsystems Inc |
| Chipset | Chips |
| Compatible with | AT |
| Connectors | RS232 |
| Requires -5VDC? | Unknown "Unknown" is not recognized as a Boolean (true/false) value. |
| Requires -12VDC? | Yes |
| Config method | Jumpers, Software |
| Motherboard | |
| Form factor | ISA/16-bit "ISA/16-bit" is not in the list (AT, Baby AT, ATX, EATX, microATX, Mini ITX, PC/104, XT) of allowed values for the "Has form factor" property. |
| Power connector | |
| CPU socket | Unknown "Unknown" is not in the list (Socket 5, Socket 7, Socket 8, Slot 1, Socket 370, PLCC68, Socket 3, PGA132, Slot 2, Slot A, ...) of allowed values for the "Has CPU socket" property. |
| ISA slots | 1 @ 16-bit |
| RAM slots | 4 @ 30-pin |
| Maximum RAM | 8MB 8,388,608 B |
| Boot ROM | Socket, 28-pin JEDEC, read-only |
| IO Controller | |
| Serial ports | 2 |
| UART | |
| COM1/2/3/4? | Yes / Yes / Yes / Yes |
| Parallel ports | 1 |
| Bi-dir? | ? "?" is not recognized as a Boolean (true/false) value. |
| ECP? | ? "?" is not recognized as a Boolean (true/false) value. |
| EPP? | ? "?" is not recognized as a Boolean (true/false) value. |
| LPT1/2/3/4? | Yes / Yes / Yes / No |
| Game ports | 0 |
| Manual | ? |
| Driver | ? |
The N286 is a single-board computer based around the 80286. It contains onboard serial and parallel ports, configurable through the BIOS as COM1-4 and LPT1-3. It provides a 16-bit ISA bus, configurable to run at 10 MHz, 6 MHz or 3MHz (for the N286S/10 model.) The bus speed can be changed through the BIOS setup.
BIOS
During POST, pressing Alt + Ctrl + S will enter the BIOS setup. This key combination still works up until an OS has started booting, which means it can be pressed even after an attempted boot that has resulted in an "invalid system disk" message.
Internal connectors
| Connector | Purpose | Details |
|---|---|---|
| E1 | External battery | Assumed, not tested |
| E2 | Unknown | Possibly switch between onboard and external battery |
| E3 | Unknown | Jumper block |
| E4 | Speaker | Short pins 3-4 with a jumper to enable the onboard speaker. An external speaker can be connected to either pins 1 and 4 (for a four-pin connector, onboard speaker remains silent), or pins 3 and 4 (for a two-pin connector, onboard speaker also sounds.) Note that the speaker is also accessible through J5. Polarity is not important, however pin 4 is positive/+/red and pins 1/3 are negative/-/black. |
| E5 | Unknown | Jumper block |
| E6 | Serial #2 | Second serial port, COM1-4 configurable through BIOS setup |
| J5 | Front panel connector | See below |
J5: Front panel
| J5 pin | Purpose | Details |
|---|---|---|
| 1 | Reset+ | Reset switch + (short to pin 2 to cause system reset) |
| 2 | GND | Common ground for keyboard and switches |
| 3 | Unknown | Not an LED (not enough current provided), seems to be a switch like pin 1 (also pulled high to +5V like pin 1). Nothing happens when shorting to GND. System speed does not change, so not a turbo switch. |
| 4 | Keyboard clock | Connects to DIN pin 1 / mini-DIN pin 5 |
| 5 | Keyboard data | Connects to DIN pin 2 / mini-DIN pin 1 |
| 6 | Keylock+ | Connect to GND (pin 2) to disable the keyboard. Leave floating to enable the keyboard. |
| 7 | +5 VDC | Keyboard power for DIN pin 5 / mini-DIN pin 4. Also equivalent to E4 pin 4 (Speaker+). |
| 8 | Speaker- | Equivalent to E4 pin 1 (Speaker-). Connect an external speaker to pins 7-8 as an alternative to using E4. |
Additional photos
- Texas Micro N286 underside.jpg
Underside
