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Re: MESS Dumping Project ? [Re: judge] #38571 02/19/08 05:42 PM
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R. Belmont Offline
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Awesome smile

Re: MESS Dumping Project ? [Re: R. Belmont] #38573 02/19/08 06:40 PM
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incog Offline
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will this make mess the first emulator for this system?

great work!

Re: MESS Dumping Project ? [Re: incog] #38582 02/19/08 08:42 PM
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etabeta78 Offline
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to my knowledge yes. takeda only emulated the Super Cassette Vision (which could be MESSable as well with the new core I guess, if dumps would surface... before or later)

Re: MESS Dumping Project ? [Re: etabeta78] #38752 02/25/08 05:45 PM
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incog Offline
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Just cracked open a Commodore 64 tv-game with 30 games on it.

PCB Scan

Re: MESS Dumping Project ? [Re: incog] #38754 02/25/08 05:50 PM
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Interesting - the one chip might be a flash ROM, but the rest of it's blobs like you'd expect.

Re: MESS Dumping Project ? [Re: R. Belmont] #38798 02/26/08 03:47 PM
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Lord Nightmare Online Content
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EDIT: Hey wait a second... Incog, is that an NTSC one or a PAL one? If its the PAL "DTV2/3" one, the "DTV1" description below is inaccurate for it, but the description below that should be correct.
EDIT2: Its an NTSC one, for sure.

That may be the NTSC "DTV1" which has a few bugs in the c64 timing, and doesn't properly handle a number of the 6510/6502 undocumented opcodes. It also has the LUMA DAC with the wrong value resistors and hence produces a way-too-dim picture unless you manually replace the resistors in the DAC, with the revision C64A1 (as opposed to revision C64A, which had 3 extra wires due to some inadvertently omitted traces which were corrected on revision C64A1) mainboard.

The large blob is the DTV1 ASIC (origianlly called 'JSTICK64'), designed by Jeri Ellisworth.
The small blob is a 2MB OKI-made mask rom, afaik it has not been fully dumped yet, and more than one version may exist. It can be dumped via IEC or being bit-banged out an I/O line, or even displayed to screen if you feel like retyping 2 megs of data. It requires a program to be written (in c64 basic) to bankswitch it and do the bit banging.
The TFP chip which looks like flash is actually 128K of SRAM.

See:
http://en.wikipedia.org/wiki/C64_Direct-to-TV
http://picobay.com/dtv_wiki/index.php?title=DTV_Version_1

We still need an unhacked/unreflashed DTV2/3 (PAL) to get a dump of the original flashrom too (The PAL DTV uses a flash rom as opposed to a mask rom). The NTSC mask rom and the PAL flash rom contents are quite different. The flashrom is a surface mounted AT47BV161T which is an older, buggier (byte write mode only SOMETIMES works), fewer-erases-until-errors-happen version of the AT49BV161T and AT49BV163A. The AT47BV161T was ONLY used on the DTV and a few other products, and was never released to the public, unlike the latter two products.
I'm sure Guru can handle it.
DTV2 (PAL) has a bug in the blitter which was fixed on DTV3 (PAL)

See:
http://picobay.com/dtv_wiki/index.php?title=DTV_Version_2/3

I have one of the 'Hummer' DTV units, unmodded, available for dumping. Uses an AT49BV163A flash chip. Again, Guru can handle these.

See:
http://picobay.com/dtv_wiki/index.php?title=Hummer

LN


"When life gives you zombies... *CHA-CHIK!* ...you make zombie-ade!"
Re: MESS Dumping Project ? [Re: Lord Nightmare] #39116 03/06/08 03:15 AM
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Good news--all five Epoch Game Pocket Computer games have now been dumped! And for those interested, the system's also got a good website in development by Chris Covell, the guy who dumped the BIOS.

http://www.disgruntleddesigner.com/chrisc/GamePokekon/

Re: MESS Dumping Project ? [Re: ranger_lennier] #39124 03/06/08 02:21 PM
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incog Offline
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Great news on the Epoch handheld laugh

I just got a Videomaster Star Chess through the post.

PCB Scan


Check out the graphics on this baby.

The Emerson Arcadia 2001 star chess game rom is 4k, this console has 2 6801's @ 2k internal rom each so its probably safe to say that the game is stored in the 6801's. Does anybody have a method of dumping these?

Last edited by incog; 03/06/08 04:36 PM.
Re: MESS Dumping Project ? [Re: incog] #39128 03/06/08 06:59 PM
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Guru Offline
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6801S has 2k ROM
6801V has 4k ROM

They are code compatible with the 6800 series of CPUs. The 6801 is a ROM version of the 6803 from what I read.
A somewhat detailed datasheet is here....
http://www.mameworld.net/gurudumps/temp/hd6801v.pdf

Unfortunately there's no mention of the ROM and how to read/access it, or even if there's a protection bit.

The same 6801V's are used in the carts for the Gakken TV Boy handheld I have.




Guru

Re: MESS Dumping Project ? [Re: Guru] #39137 03/06/08 10:46 PM
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Robbbert Offline
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You need to go to guru's home page before pasting the link in your browser.

I looked in my Motorola 8-bit Microprocessor and Pheripheral Data Book, but for the 6801 I need to read the Microcomputer Data Book, which of course, I don't have.

It does list the 6803E though, in excrutiating detail - including the differences to the 6801.

Now, if only I had a scanner...

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