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Screenshots galore

Posted by benryves, 20 November 2006 · 29 views

I downloaded a collection of homebrew releases from SMS Power! for testing. Here are the obligatory screenshots.

Sega Master System

Copyright Violation is displayed incorrectly - the text should be on top of the stars, but that VDP feature is as yet unsupported.

Sega Game Gear

Yes, Windows and DOOM were ported to the Game Gear. That second screenshot is DOOM's automap. [wink]

There are still lots of ROMs that won't go - that could be due to poor VDP emulation, or it could be due to ROM paging errors (the emulated memory is just straight 64KB RAM), or could be down to the remaining bugs in the Z80 emulation.

johnhattan
Nov 21 2006 12:30 AM

Cool. A PC Emulating a console emulating Chip8.

That's just obscene :)

benryves
Nov 21 2006 12:35 AM

Hm, just noticed that in-gameto r in that first Chip-8 screenshot is wrong. That's what it's meant to look like. I fixed a scrolling bug after taking those screenshots that might have remedied it, but I think there's a bug in the way I handle address register changes (or latching) with the VDP. A lot of programs display scrambled junk.

Scet
Nov 21 2006 06:25 AM

Does Doom actually run? I would imagine there are quite a few hardware tricks going on.

benryves
Nov 21 2006 06:41 AM

Quote:
Original post by Scet
Does Doom actually run? I would imagine there are quite a few hardware tricks going on.

WinGG is a demo program with some small applets in it, one of which displays a static picture from DOOM. [smile]

The Master System and Game Gear ran at ~3.3MHz and had 8KB RAM. The graphics was tile-based (no real raster graphics mode) so a DOOM game would be almost impossible.

Scet
Nov 21 2006 07:44 AM

Doom has been ported to some really crappy systems, though usually with a lot of content removed. And I've seen some crazy stuff done with tile based graphics using the HBlank interrupt and rotation/scaling, although I don't think the SMS/Game Gear has that.