Ashet Home Computer Specification
DISCLAIMER: This is a living document, do not take anything here for granted!
Hardware
CPU
- SPU Mark II, a 16 bit processor
Memory
- 8 MB of flash
- Up to 8 MB of ram
Peripherials
- VGA video
- 4 serial ports
- 2 * RS232
- 1 * USB Serial
- 1 infrared serial interface for wireless data transfers
- 2 PS/2 ports for keyboard and mouse
- 2 IDE slots for mass storage
- 2 (digital) joystick ports, compatible to c64/amiga/cpc/…
- IEEE 1284 II parallel port
- PCM audio interface
- Real time clock
- 10 MBit Ethernet
- Possibly based on ENC28J60 or ENC624J600
Memory Map
| Address Range | Memory Type | Component |
|---|---|---|
0x0***** |
(Memory) | up to 8 MB Flash ROM |
0x7FE*** |
(Peripherial) | I/O Page |
0x7FF*** |
(Peripherial) | VGA Sprite Data |
0x80**** |
(Memory) | up to 8 MB of RAM |
The I/O Page contains all peripherial registers and links to the peripherial devices.
DMA Devices
The following devices have memory access (with priority top-to-bottom):
- VGA Controller
- Audio Controller
- CPU
- DMA Controller
IRQ Table
| IRQ Number | Peripherial |
|---|---|
| 0 | COM1 |
| 1 | COM2 |
| 2 | COM3 |
| 3 | COM4 |
| 4 | PER1 |
| 5 | PER2 |
| 6 | PCM |
| 7 | DMA |
| 8 | TIMER0 |
| 9 | TIMER1 |
| 10 | VGA |
| 11 | ETHERNET |
| 11 … 31 | unused |
Serial Ports
| COM Name | Connector | Base Address |
|---|---|---|
COM1 |
USB | (TBD) |
COM2 |
RS232 1 | (TBD) |
COM3 |
RS232 2 | (TBD) |
COM4 |
IR | (TBD) |
PS/2 Ports
| Function | Connector | Base Address |
|---|---|---|
PER1 |
KEYBOARD | (TBD) |
PER2 |
MOUSE | (TBD) |
Timers and RTC
Timer 0 runs at 1 MHz, Timer 1 runs at 1 kHz.