MIPS Assembly programming for the Playstation 1 (PS1/PSX)
| The Playstation was Sony's first home
console, While inferior in some ways to the more powerful N64, the
Playstations huge storage capability, combined with an impressive
game library saw the Playstation become the most popular console of
the period, catapulting the playstation to the top of the console
market. |
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Memory Map
| KUSEG | KSEG0 (Cached) |
KSEG1 (Uncached) |
KSEG2 (IO Ports) |
Size | Purpose |
| 0x00000000 | 0x80000000 | 0xA0000000 | -- | 2048K |
Main RAM (first 64K reserved for BIOS) |
| 0x1F000000 | 0x9F000000 | 0xBF000000 | -- | 8192K | Expansion Region 1 (ROM/RAM) |
| 0x1F800000 | 0x9F800000 | -- | -- | 1K | Scratchpad (D-Cache used as Fast RAM) |
| 0x1F801000 | 0x9F801000 | 0xBF801000 | -- | 8K | I/O Ports |
| 0x1F802000 | 0x9F802000 | 0xBF802000 | -- | 8K | Expansion Region 2 (I/O Ports) |
| 0x1FA00000 | 0x9FA00000 | 0xBFA00000 | -- | 2048K | Expansion Region 3 (whatever purpose) |
| 0x1FC00000 |
0x9FC00000 |
0xBFC00000 |
-- | 512K | BIOS ROM (Kernel) (4096K max) |
| -- | -- | -- | 0xFFFE0000 |
0.5K | I/O Ports (Cache Control) |
Gpu Commands
Written to port 0x1F801810
| Function | Byte | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| Clear Cache | 0 | 0x01 | 0 | ||||||||||||||||||||||||||||||
| Function | Byte | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| Set Screen Width | 0 | 0x06 | End X | Start X | |||||||||||||||||||||||||||||
| Function | Byte | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| Send image to Framebuffer | 0 | 0xA0 | |||||||||||||||||||||||||||||||
| 1 | Y | X | |||||||||||||||||||||||||||||||
| 2 | H | W | |||||||||||||||||||||||||||||||
| 3 | Pixel 2 | Pixel 1 | |||||||||||||||||||||||||||||||
| .. | .. | ... | |||||||||||||||||||||||||||||||
| n | Pixel n*2+1 | Pixel n*2 | |||||||||||||||||||||||||||||||
| Function | Byte | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
Screen Memory
Each pixel is represented by one BIG ENDIAN word, in the format %-BBBBBGGGGGRRRRR
Endian
The N64 is BIG ENDIAN
the PSX is LITTLE ENDIAN
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