Those keen on collecting classic operating system emulators should take heed: PSPDragon, the Tandy Color Computer and Dragon32/64 emulator for the PSP is finally updated with fixes and improvements by homebrew developer zx-81 (previous version here). The fixes include patching up sound problems, including those the crop up while playing Demon Attack.

Here's the complete changelog for PSPDragon v1.0.3:

* Speed improvements, the z80 part has been rewritten using jump tables,
* Emulation accuracy improvements (original hidden frameskip of one has been removed, and cpu cycles are modified according to ntsc/pal mode)
* Add ntsc/pal option
* Display and save thumbnail images for each save state
* Add several new hotkeys :
* settings such as fps, render mode, auto fire speedcan now be directly modified inside the emulator (no need to enter in the settings menu)
* quick save / quick load current state (no need to enter in the main menu)
* Default Hotkeys can now be set in the keyboard mapping menu (useful to add hotkeys on existing/previous keyboard files)
* Auto-fire mode, press RTrigger+X to switch it on/off
* New graphics and add a simple intro splash screen
* Option to display frame rate
* Option to prevent the blue led to be displayed when L or R are pressed

Those interested in nabbing this release should go over the documentation (readme, etc) included in the download before installing. That said, have fun!