[SpinelSun]

no. Those are overdumps done with his genesis side dumping program to show me what he is seeing.
In all likelyhood, my original dump was good. But in anycase, Tiido will be desoldering the BIOS ROMs and dumping them directly so we'll know exactly whats on the chip. So, wait abit.

[TmEE]

http://www.fileden.com/files/2008/4/21/1876835/XEYE-G304.BIN

This is the chip dump of the Xeye BIOS, and the chip IS as mask ROM, and there seems to be some "serial number" too, Xeye has G304, Wondermega has G301.

And seems when I did my first chip dumps last year, things somehow got mixed up or something... and I can safely say that bumping MCD BIOSes from MD side off a cart is not a good idea, since the vector gets shadowed with FFFF... it is fun that whole address range has it FFFF...

so it seems your dump was good afterall


I'll be chipdumping Wondermega BIOS too in some moments when I start soldering adaptor wires to it.

[Revival]

I'm picking up a Mega-CD soon, I'll be sure to dump the BIOS. Just one I'm nabbing from eBay.

@those who don't have a parallel port: How the hell can you not have LPT? Your computer must be one of those NetBooks.

[Sik]

@those who don't have a parallel port: How the hell can you not have LPT? Your computer must be one of those NetBooks.

Most new computer lack a parallel port. All new devices are pretty much either using USB or are wireless, so by this point supporting the parallel port seems useless for manufacturers. Some motherboards have the connections internally, just not the plugs, though some truly have it removed.

So, yeah, you need to get an old computer to have a parallel port these days =/

[SpinelSun]

http://www.fileden.com/files/2008/4/21/1876835/XEYE-G304.BIN

This is the chip dump of the Xeye BIOS, and the chip IS as mask ROM, and there seems to be some "serial number" too, Xeye has G304, Wondermega has G301.

And seems when I did my first chip dumps last year, things somehow got mixed up or something... and I can safely say that bumping MCD BIOSes from MD side off a cart is not a good idea, since the vector gets shadowed with FFFF... it is fun that whole address range has it FFFF...

so it seems your dump was good afterall


I'll be chipdumping Wondermega BIOS too in some moments when I start soldering adaptor wires to it.

Awesome! Good to know my original dump was good afterall!

[TmEE]

Wondermega BIOS chipdump :

http://www.fileden.com/files/2008/4/21/187...ERMEGA-G301.BIN

some pics of dumping gear :




I would do my MCD2 BIOS dumps too, but I am not able to get the chip out without more major effort.... I will try one trick though, since I know what the ROM has to be... (relates to forcibly disabling some chips in MCD.....).

[SpinelSun]

Nice!

[NTICompass]

I have a SegaCD. It's a US version 2.00. I've bought all the parts necessary to dump the BIOS. I should have that to you by the end of the week, that is if the mail is on time.

EDIT: Got the cable created. All I need is the PCMCIA parallel port I bought.

This post has been edited by NTICompass: 29 June 2009 - 03:03 PM

[SegaLoco]

http://info.sonicretro.org/images/b/b9/Eu_mmg_930916.zip
The person who dumped this did a X'eye through the same method, and I diff'd it with our current dump and it was good, so I assume this one is good too, I just hate it when there is nothing to compare to.

[SpinelSun]

http://info.sonicretro.org/images/b/b9/Eu_mmg_930916.zip
The person who dumped this did a X'eye through the same method, and I diff'd it with our current dump and it was good, so I assume this one is good too, I just hate it when there is nothing to compare to.

The person who dumped that multimega dumped a X'eye, and his X'eye had 290f8e33 as the crc32? you sure?

Because this Multi-Mega dump looks to have two bad bytes in the vector table. At 0x72 is FFFF. So this looks like they dumped it with Mask of Destiny's cable and software. So far ALL Mega-CD/Sega-CD/CD2/CDX/X'eye/Wondermega/ Pioneer PAC-S1 and PAC-S10 have FD0C at that location.

There is trick to get 100% good BIOS dumps from MoDs software by overdumping the BIOS, I believe I mentioned it in this thred already.

Just a FYI, list of good dump bios crc32s, your files might be named different

290f8e33 us_xeye_931227.bin
d48c44b5 us_scdx_930907.bin
2e49d72c us_scd2_930621.bin
9f6f6276 us_scd2_930601.bin
8af65f58 us_scd2_930314.bin
c6d10268 us_scd1_921011.bin
50cd3d23 us_mld_930922.bin
3b10cf41 us_mld_930329.bin
d21fe71d jp_swm1_920206.bin
00eedb3a jp_mld_930329.bin
dd6cc972 jp_mcd2_921222.bin
550f30bb jp_mcd1_911228.bin
9d2da8f2 jp_mcd1_911217.bin
4d5cb8da eu_mcd2_930601.bin
0507b590 eu_mcd2_930330.bin
529ac15a eu_mcd1_921027.bin

bad dump, 0x72 in ROM has FFFF shadowed there
34d3cce1 eu_mm_930916_x.bin

most likey the good dump, but not confirmed with a redump, I just hexed the two bytes to what they most likely should be.
aacb851e eu_mm_930916_fixed.bin

This post has been edited by SpinelSun: 02 July 2009 - 06:01 AM

[SegaLoco]

Well, I know the X'Eye is good, I diff'd it with the dump that you confirmed from Tiido. I guess that it can't be helped, getting in contact with the dumper of that version would be pretty hard, I found it in some random No-Intro rom dump package. I will try, but once again, I doubt anything will come of it.

[SpinelSun]

Well, I know the X'Eye is good, I diff'd it with the dump that you confirmed from Tiido. I guess that it can't be helped, getting in contact with the dumper of that version would be pretty hard, I found it in some random No-Intro rom dump package. I will try, but once again, I doubt anything will come of it.

I'm assuming what you mean by diff'd it, you did a binary compare and all bytes matched? can you verify the crc32 of his dump? It's way simpler to just calc the CRC32 of the files

regardless, http://assemblergames.com/forums/showthrea...2516#post362516 He will be redumping his Multi-Mega with my overdump method using MoD's cable+software, so ther's no need to bother with no-intro at the moment.

but just FYI, http://forums.no-intro.org/viewtopic.php?f...06&start=39 is the no-intro multi-mega dumper. he specifically said in another thread that his BIOS dumps have the FFFF at 0x72 problem.

here's where he mentions his BIOS dumps have the FFFF at 0x72 problem http://forums.no-intro.org/viewtopic.php?f...mp;p=4597#p4597

This post has been edited by SpinelSun: 02 July 2009 - 01:05 PM

[SegaLoco]

Wow, thanks. I hope this works. Also, I hope that I can that Aiwa CDC GM1 bios.

[SpinelSun]

Wow, thanks. I hope this works. Also, I hope that I can that Aiwa CDC GM1 bios.

I have a lead on a Wondermega M2 (RG-M2) BIOS thats been dumped but not released, but so far no response. I'll give it a fewmore days before trying again.

This post has been edited by SpinelSun: 02 July 2009 - 01:14 PM

[SegaLoco]

I do as well, well, I don't know which one it is, but it is one of the Victor/JVC WonderMegas. I am contacting Tiido's friend Fonzie about it, as well as some dude named Skullmonkey.