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Download PSX BIOS and game in BIN or ISO format and upload using web form.
If you want to commit to the repository, please run linter first and cover code with tests.
Memory map: https://psx-spx.consoledev.net/memorymap/
| KUSEG (Virtual) | KSEG0 (Physical Mirror with Cache) | KSEG1 (Physical) | Memory size | Type |
|---|---|---|---|---|
| 00000000h | 80000000h | A0000000h | 2048K | Main RAM (first 64K reserved for BIOS) |
| 1F000000h | 9F000000h | BF000000h | 8192K | Expansion Region 1 (ROM/RAM) |
| 1F800000h | 9F800000h | -- | 1K | Scratchpad (D-Cache used as Fast RAM) |
| 1F801000h | 9F801000h | BF801000h | 8K | I/O Ports |
| 1F802000h | 9F802000h | BF802000h | 8K | Expansion Region 2 (I/O Ports) |
| 1FA00000h | 9FA00000h | BFA00000h | 2048K | Expansion Region 3 (SRAM BIOS region for DTL cards) |
| 1FC00000h | 9FC00000h | BFC00000h | 512K | BIOS ROM (Kernel) (4096K max) |
| KSEG2 | Size | |
|---|---|---|
| FFFE0000h | 0.5K | Internal CPU control regs (Cache Control) |
PSX uses 32bit wide regs, they are the following
| Name | Alias | Common Usage |
|---|---|---|
| (R0) | zero | Constant (always 0) (this one isn't a real register) |
| R1 | at | Assembler temporary (destroyed by some pseudo opcodes!) |
| R2-R3 | v0-v1 | Subroutine return values, may be changed by subroutines |
| R4-R7 | a0-a3 | Subroutine arguments, may be changed by subroutines |
| R8-R15 | t0-t7 | Temporaries, may be changed by subroutines |
| R16-R23 | s0-s7 | Static variables, must be saved by subs |
| R24-R25 | t8-t9 | Temporaries, may be changed by subroutines |
| R26-R27 | k0-k1 | Reserved for kernel (destroyed by some IRQ handlers!) |
| R28 | gp | Global pointer (rarely used) |
| R29 | sp | Stack pointer |
| R30 | fp(s8) | Frame Pointer, or 9th Static variable, must be saved |
| R31 | ra | Return address (used so by JAL,BLTZAL,BGEZAL opcodes), can be used as general purpose register |
| - | pc | Program counter |
| - | hi,lo | Multiply/divide results, may be changed by subroutines |
To read more go: https://en.wikipedia.org/wiki/Instruction_set_architecture and http://problemkaputt.de/psx-spx.htm#cpuspecifications
| Type | -31- format (bits) -0- | |||||
|---|---|---|---|---|---|---|
| R | opcode (6) | rs (5) | rt (5) | rd (5) | shamt (5) | funct (6) |
| I | opcode (6) | rs (5) | rt (5) | immediate (16) | ||
| J | opcode (6) | address (26) |
The provided screenshots are valid for MIPS CPUs, but there may be differences with the actual PSX CPU, so be careful
