Soywiz has built a PSP emulator for the PC using a debugger with D programming language and DFL library.
At the moment all it can do is perform some instructions and some BIOS calls, but in the future it may develop into much more.
Download: PoC PSP Emulator for PC
To quote: This is a proof of concept I made of a PSP Emulator with a debugger using D programming language (Walter Bright) and DFL library (Chris Miller).
This emulator is based in another great opensource emulator psplayer (Noxa) and the laudable work of ps2dev community. Demos included are part of the pspsdk.
(2008/03/01) Partial (and buggy) lighting support. Some cleanups. Starting gui for breakpoints and gpu (not working yet). Corrected callstack. Some fixes; more homebrew demos supported. Temporally skinning broken. Temporally shaders disabled. Updated binaries. Reduced size of the font used in dissasembler and memory viewer. Allowing reduce dissasembler window size; now imports won't overlap). Initial support of opening files (not working fine yet). Threading support currently disabled (I have to fix some issues). mstick and reflection demos not supported yet.
BTW: control+g in dissasembler & memory viewer to go to any address (can use expressions like pc+a0*4 or static hexadecimal adresses 0xXXXXXXXX or mixed 0xXXXXXXXX+v0*16). Double click in a register to modify it. Expressions can be used also in register changing. Supports decimal numbers, hexadecimal (ex. 0xF3) and binary (ex. 0b101)
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