The Third 512-byte OS Contest!

Troy Martin · **Posted:** Mon May 25, 2009 8:42 am

salil: Crashes in both Bochs and VPC:

Code:

00112411872p[FDD  ] >>PANIC<< write 0x03f5: receiving new command 0x00, old one
(0xe6) pending
00112411872e[FDD  ] io_write: 0x3f5: invalid floppy command 0x00
00128689730e[CPU0 ] read_RMW_virtual_word_32(): segment limit violation
00128703055e[CPU0 ] read_RMW_virtual_word_32(): segment limit violation
00128716380e[CPU0 ] read_RMW_virtual_word_32(): segment limit violation
00128729705e[CPU0 ] read_RMW_virtual_word_32(): segment limit violation
00128743030e[CPU0 ] read_RMW_virtual_word_32(): segment limit violation
00128756355e[CPU0 ] read_RMW_virtual_word_32(): segment limit violation
00128769681e[CPU0 ] read_RMW_virtual_word_32(): segment limit violation
00128783007e[CPU0 ] read_RMW_virtual_word_32(): segment limit violation
00128829255i[CPU0 ] WARNING: HLT instruction with IF=0!

salil_bhagurkar · **Posted:** Mon May 25, 2009 9:21 am

That is weird. For me it works perfectly fine in both Bochs and Qemu. I don't know about VPC since i don't have it right now. It seems to have written to the port 0x3f5.. Did you do that or it just happened. I am not using that port by default in code. Are you sure you configured bochs correctly?

Masterkiller · **Joined:** Sat May 05, 2007 6:20 pm **Posts:** 153

salil_bhagurkar wrote:

That is weird. For me it works perfectly fine in both Bochs and Qemu. I don't know about VPC since i don't have it right now. It seems to have written to the port 0x3f5.. Did you do that or it just happened. I am not using that port by default in code. Are you sure you configured bochs correctly?

It works fine, anyway in bochs I was unable to restart neither writing FE to 0064, not writing 01 to 0092, it just stops, but in Virtual PC works fine. Anyway that problem is not part of your program

salil_bhagurkar · **Posted:** Mon May 25, 2009 9:59 am

Yes, I just tried it in Bochs-2.3.7 and it just freezes. But it works in old versions of Bochs. I guess its about clearing the 8042 buffer or something.

Troy Martin · **Posted:** Mon May 25, 2009 4:40 pm

salil_bhagurkar wrote:

That is weird. For me it works perfectly fine in both Bochs and Qemu. I don't know about VPC since i don't have it right now. It seems to have written to the port 0x3f5.. Did you do that or it just happened. I am not using that port by default in code. Are you sure you configured bochs correctly?

It doesn't even boot. freezes after a bunch of dots.

quanganht · **Posted:** Tue May 26, 2009 8:10 pm

Music demo gives sounds on VM Ware

salil_bhagurkar · **Posted:** Tue May 26, 2009 9:47 pm

Whats the prize for being last in the poll? :lol:

Masterkiller · **Joined:** Sat May 05, 2007 6:20 pm **Posts:** 153

Yeah, 10x for that music demo. I just discovered that my internal speaker not working. Anyway MS VPC emulate the sound of internal speaker through the sound card

Hm, now I'm looking for a speaker...

BTW scgtrp, you should try to upgrade your etch a sketch with a mouse driver outside of the competition. It'll result a really good program

salil_bhagurkar · **Posted:** Wed May 27, 2009 10:18 pm

I don't understand how Zenith rolls in the whole song in 512 bytes. Its got the PC speaker frequency information, the tone delay and the graphic colors... How can that fill in to 512 bytes? Or is he compressing?

NickJohnson · **Posted:** Thu May 28, 2009 8:20 am

I don't think compression would save much space regardless of what you're doing. 512 bytes of anything will only compress fractionally, and you also need to add a decompression routine.

Coty · **Joined:** Thu Feb 12, 2009 5:12 pm **Posts:** 286

yes, the rotien would cost more than what it would be worth... I cannot find the source, was it even included?

Coty · **Joined:** Thu Feb 12, 2009 5:12 pm **Posts:** 286

oops

Troy Martin · **Posted:** Thu May 28, 2009 4:11 pm

I don't think it was... I'll definitely include that as a rule in the next compo.

Coty · **Joined:** Thu Feb 12, 2009 5:12 pm **Posts:** 286

So i guess how it works will remain a mystery.

Troy Martin · **Posted:** Thu May 28, 2009 4:15 pm

Well, one could always decompile the binary, but that would translate stuff incorrectly..

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The Third 512-byte OS Contest!

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