Archive for May, 2009

What I learned from FuSa, and other PSP musings

Wednesday, May 27th, 2009

A while back, I posted about my experience with PSP 2000’s video output capability – specifically, disappointment with the unscaled output on large-screen TV’s, and the lack of support for games on older CRT’s. The post, surprisingly, resulted in a lot of feedback from the community, on this site, as well as many others – some fanboyish, some understanding or agreeing, but mostly positive and a few helpful. Main suggestion was to use a plugin called FuSa, which is basically able to do everything that the PSP alone couldn’t do.

FuSa scales the image sent to the TV, and can adjust the output frequency, to accommodate things like rendering games to CRT TV’s (which normally only works while watching UMD’s). With the several emulators that I’ve tested, the plugin works remarkably well, which only begs the question – why wasn’t this included in the PSP 2000’s firmware to begin with? While the scaled-down image on a composite output looks jagged and low-res (understandably so), many PSP owners would’ve much rather had bad output, than no output at all – myself included.

Whether or not FuSa is the reason why the newer PSP-3000 models actually will display games through a composite cable is something we’ll never know, but I suppose the point of all this is that custom firmware, and custom plugins make the PSP a lot more than a run-of-the-mill handheld. Don’t get me wrong – the PSP itself was, for its time, revolutionary – and in many ways still is. But I doubt that the system would be as popular as it is today, if it wasn’t for the homebrew community and all of its contributions and offerings. Piracy is an unfortunate side-effect of all this, and while it may be ultimately what Sony’s concerned most about, for classic computer/emulation enthusiasts such as myself, the PSP’s abilities as a homebrew development and emulation entertainment center are the only reasons why I own one (actually, two).

Tape and disk image options in VICE PSP

Tuesday, May 26th, 2009

It seems that in my hurry to put the emulator up for download, I forgot to mention some important usage details about tape and disk image loading. As you may have noticed, VICE PSP normally resets the system, anytime you attempt to load a game from the Game tab. This is behavior that’s consistent in all my ports, and it’s intended to make most games easily loadable. VICE PSP also provides some fine-tuning options, for games that require multiple disks or tapes.

To load tapes/disks without resetting the system, go to the System tab, select the Tape or Drive 8 menu option (depending on whether you want to load a tape or disk image), then press CROSS to load another image. If a tape or disk image is already loaded, it will be ejected, and another one will be loaded in its place. To eject a loaded image, select an option, and press TRIANGLE.

To autoload a program, first load the image, then go to the System tab, highlight the Tape or Drive 8 menu option, and press RIGHT. Select a program from the list, and press CROSS to autoload it. Note that this will reset the system.

VICE PSP version 2.1.1 released

Saturday, May 23rd, 2009

VICE PSP is now out. The sound lag seems to be fixed; however there are some issues: for one, the FPS counter sometimes reports incorrect data after frame skipping goes into effect (showing 4 FPS, when the emulator’s actually rendering at 50), and annoying stuttering noise while frames are being skipped.

I would like the sound engine to be more polished prior to release, but I’ve only had a few hours to work in the last two weeks (not likely to improve any time soon), and I feel like it’s in a suitable enough state.

VICE is a series of Commodore emulators; for now, I’ve only ported the C64 emulator. I’ve wanted to port a C64 emulator for a while now; as a fan of chiptunes/demoscene music (I recommend Kohina, by the way), I’m familiar with the popular SID chip that gave talented musicians like Martin Galway, Rob Hubbard and Ben Daglish an outlet to produce some of the most brilliant sets of bleeps and bloops to grace one’s ears.

Now it’s almost 4 AM, and I should probably turn in.

Download

VICE PSP status

Tuesday, May 12th, 2009

VICE PSP is largely complete; I say “largely,” because the main thing holding it back at the moment is intermittent sound lag.

What is definitely going to be in the release:

  • The usual features present in my other computer emulator ports: virtual keyboard, state autoloading, per-game configurable input, peripheral indicators, state saving/loading
  • Support for tape images, disk images, cartridges. Each can be “inserted”, “ejected”, and auto-run (by which I mean that a specific program on tape/disk can be automatically run) separately
  • Several other things that are a side-effect of being a port of VICE, so to speak :)

The sound lag issue presents itself when emulator begins to skip frames – sound works perfectly (as far as VICE is concerned, anyway) otherwise. It would be fairly safe to say that once this is fixed, a release is imminent.