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> OS Construction > Space Invaders meets the 1.44MB FAT32 floppy disk |
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Mike Gonta 09 Feb 2017, 23:54
Space Invaders meets the 1.44MB FAT32 floppy disk. SPACE INVADERS by PAUL S. REID Version 1.1 An Exact Clone of the Arcade Game in 100% Assembler Game, Source Code, and Documentation Included Freely Distributable - No Shareware Fee Released September 17, 1995 - MINOR BUG FIXES Bootable and completely stand alone 80386 FASM / NASM assembly language Only requires a classic BIOS or UEFI enabled CSM 1.44MB FAT32 floppy disk image Will boot and run from an actual floppy disk Run it in an emulator Transfer it to a USB flash drive for boot and run fun! See LICENSE.md and Space Invaders Document.txt Space Invaders Last edited by Mike Gonta on 11 Apr 2017, 17:48; edited 7 times in total |
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09 Feb 2017, 23:54 |
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rugxulo 10 Feb 2017, 01:11
Mike Gonta wrote:
This can't be a coincidence, can it? Did you see my very recent DOS message about this game? Or are you aware of my older (sloppier, imprecise) ad-hoc conversion (circa 2004), aka INV2FASM? I had already posted that on this forum, back in the day (2005). BTW, I only posted my (new) FASM script here, but I also had recently made scripts for NASM, LZASM, JWasm, A86. For various syntactical reasons (brevity, clarity, and compatibility), I decided to keep them separate instead of trying to combine into one single quasi-acceptable version. So it's not like I ignored NASM (not that they would really care, of course). Besides, just to state the obvious, NASM is portable but bloated and needs C99 compiler to bootstrap. Quote:
Good, you saved some space by not needing a full OS kernel. Of course, there were also ports of this game to Dex's MiniDOS and OctaOS back in the day. And just to be pedantic, it is indeed 8086 friendly but relies on VGA, which is rare on such machines. And honestly, IIRC, it was too slow even on a 486, so it's unlikely that being 8086 compatible is really helping anyone here. But, of course, that's just the way it was written. And some environments (emulators, etc.) are bad about timing, so it's also less useful there. Honestly, I almost want to rewrite it in Turbo Pascal (dialect). But there's already a QB version (with XPL0 rewrite) of a similar invaders clone, which I haven't looked at closely. Quote:
Okay, but (Free)DOS already does this too, and it is indeed a DOS game (originally). There's less flexibility in using a standalone version. For instance, how would you reassemble or even edit the source .ASM? (I see it's included on the .img, but you can't actually access it.) Quote:
I'm not sure of exact license. It's a custom one, not exactly OSI or FSF approved. But I have no idea how to contact him to attempt to relicense either. |
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10 Feb 2017, 01:11 |
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Mike Gonta 10 Feb 2017, 01:56
rugxulo wrote:
rugxulo wrote:
rugxulo wrote: Of course, there were also ports of this game to Dex's MiniDOS and OctaOS back in the day. directory and runs it. The file is named "Kernel.bin" and this is the Space Invaders binary. The other files are text files and there are no hidden files or 2nd stage. rugxulo wrote:
loaded com file that returned to DOS. rugxulo wrote: There's less flexibility in using a standalone version. For instance, how would you reassemble or even edit the and Linux and works fine as a mounted image or on a USB flash drive. rugxulo wrote:
Paul S. Reid wrote: Use it as you will, but give me a little credit if you are going to modify the game. By this I don't mean put my Last edited by Mike Gonta on 11 Apr 2017, 17:51; edited 2 times in total |
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10 Feb 2017, 01:56 |
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neville 10 Feb 2017, 19:05
rugxulo wrote: Of course, there were also ports of this game to Dex's MiniDOS and OctaOS back in the day I also "ported" Invaders to my OS FAMOS back in 2005, but with only 4 DOS calls to deal with, it didn't take much porting. At the time it was much easier for me to patch the binary than to reassemble the source. Apart from the INT21/4C the other 3, as Mike Gonta says, were for hooking INT15 using INT21/35 and INT21/25 which are easily replaced with a direct read and write to the IVT. In fact I took the opportunity to force 80386 dependence on the game by reading and writing the IVT via eax 
Eventually in 2008 I announced version 1.11 of FAMOS here which by then included several ported games including Invaders. Sorry the link on that post is now dead but in 2009 I posted version 1.15 of FAMOS right here on this board, still complete with Invaders 
Hard to believe that was 8 years ago now, so maybe I should think about posting an update... _________________ FAMOS - the first memory operating system |
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10 Feb 2017, 19:05 |
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neville 11 Feb 2017, 21:33
Mike Gonta wrote: Actually, Space Invaders is almost an OS.  _________________ FAMOS - the first memory operating system |
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11 Feb 2017, 21:33 |
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rugxulo 25 Feb 2017, 14:52
I found another one (standalone/booter, ASCII text only, builds with NASM, MIT license).
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25 Feb 2017, 14:52 |
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