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#109643 - 05/25/17 12:25 AM Re: New dumps [Re: Darkstar]  
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BeckieRGB Offline
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I've done another round of dumps and I got the same result, so I'm calling it actually 16MB unless they pulled a nasty trick like replacing #CE with another address line or something. :P Not saying it's impossible I could have missed something though.

Most of these aren't mask ROMs but no-name BGA EEPROMs on a thin PCB with castellated vias matching a SOP44 package, sometimes with additional address lines on top. I actually found a pinout someone else did:

https://www.eevblog.com/forum/begin...ded/?action=dlattach;attach=276548;image

In most cases the pins labelled WE# and A22 in that diagram have turned out to be A22 and A23; in only one case they turned out to be A23 and A22. (There are usually silkscreen labels where there are contact points for A23 and above, so it's usually easy to find out which one it is.) If it isn't a thin PCB, it's usually a NOR or NAND Flash chip that I can actually find a datasheet for. In only two cases so far have I been unable to find any information at all: the VG Pocket Tablet has a chip labelled W321TG and the VG Pocket Caplet has a chip labelled BSIC M6MLT947.

Last edited by BeckieRGB; 05/25/17 12:27 AM.
#109644 - 05/25/17 02:28 AM Re: New dumps [Re: Darkstar]  
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BeckieRGB Offline
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Actually, on a whim I decided to hook up the W321TG chip to my Xeltek programmer, choose the closest device it supported (MX29LW321TT), ignore the device ID warnings, and just dump it. I got a 4MB file, and here's the kicker, it runs in EmuVT!

https://www.dropbox.com/s/4s0dxwrbmt3kpbx/vgtablet.zip?dl=0

Didn't have similar luck with the M6MLT947 though.

#109645 - 05/25/17 04:53 AM Re: New dumps [Re: Darkstar]  
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AJR Offline
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M6MLT947 sounds like a Mitsubishi part number; the prefix is known to have been used for some Flash/SRAM multi-chip packages.

#109646 - 05/25/17 05:28 AM Re: New dumps [Re: Darkstar]  
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mixmaster Offline
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Hmm... this "VG Tablet" dump appears to be suited for at least a different custom variation of the VT03? Most of the games crash in regular VT03 mode, besides VT03_HR, VT09_TV and VT09_LCD within EmuVT 1.43 despite not using anything special. I'm sure Haze can figure this out for MAME...

In addition, some pixels don't appear to have their palette format decoded properly with this dump in the same former emulator, implying there's crazy palette logic going on that's different from the VT03 standard that needs investigation (swapped internal color maps, perhaps? looks like it.)

Last edited by mixmaster; 05/25/17 05:29 AM.
#109661 - 05/26/17 02:35 PM Re: New dumps [Re: Darkstar]  
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Haze Offline
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Haze  Offline
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the VT03 docs mention that you shouldn't use palette DMA in NTSC mode, but apparently you could anyway if you adjust things slightly, so maybe something like that.

but it could just be there are more modes / variations on how things were hooked up

I haven't looked yet.

#109696 - 05/28/17 06:12 PM Re: New dumps [Re: Darkstar]  
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Lord Nightmare Offline
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Lord Nightmare  Offline
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A while ago, rfka01 sent me the WD1001-05 controller from a DMV machine, and I just recently desoldered and dumped the PROMs from it:

https://www.dropbox.com/s/13uk7qd5hgohpza/Western%20Digital%20WD1001-05%20Rev%20A11.zip?dl=0

LN


"When life gives you zombies... *CHA-CHIK!* ...you make zombie-ade!"
#109716 - 05/30/17 07:55 PM Re: New dumps [Re: Darkstar]  
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BeckieRGB Offline
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#109729 - 05/31/17 10:23 PM Re: New dumps [Re: Darkstar]  
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rfka01 Offline
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Bavaria
Not yet dumped ... I probably need help with this if there's interest in emulating this one:

Got a Sharp Fontwriter FW-700 really cheap and hoped it might have a nice socketed ROM that would be easily dumpable ...

[Linked Image]

[Linked Image]

Turns out, this is really a nice, solid machine with an easily readable 640x400 mono (blue on white) LCD screen and well designed word processing software.
Texts are saved in a proprietary format on FAT formatted 720K DD 3.5" floppy disks, the software can supposedly also import/export WordPerfect files.

The innards are accessed by removing the bottom lid of the machine, everything is accessible, but unfortunately SMD soldered.

[Linked Image]

[Linked Image]

The chips, starting top left and going clockwise:

Sharp LH5370PD
HM514260CJ8 = 262,144 word*16 bit DRAM
NEC 72068GF = Floppy Controller
Sharp SC65651GDO95
Mitsubishi M37720S1AFP C604100 = 16bit Microcontroller MELPS 7700 series

Some strange beasts there ...

Other Sharp LH53xx parts are ROM, so I assume the top left chip is the machine's ROM - unless some of it is hiding inside the Microcontroller - I couldn't find a defintiive datasheet on this precise part.
If someone wants a go at dumping the FW-700's ROM, give me a shout and we can work out how I can send the board to you - Germany or Europe would be easiest.


NCR DMV- DEC Rainbow- Siemens PCD- ITT 3030-Oly People- Acorn A5000- Olivetti M20
#109730 - 06/01/17 12:06 AM Re: New dumps [Re: Darkstar]  
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R. Belmont Online content
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M37720 is their extended 65816, also seen in a bunch of Namco games, so if this does get dumped I'd be happy to check it out.

Bitsavers has several years of Mitsubishi microcontroller data books so we can get lots of info on MELPS parts there.

#109732 - 06/01/17 07:44 AM Re: New dumps [Re: Darkstar]  
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rfka01 Offline
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Bavaria
Good call, RB! It's in their 1991 data book on page 2-86, and it's a ROMless 16MHz part.

http://bitsavers.trailing-edge.com/...hi_Single-Chip_16-Bit_Microcomputers.pdf

I got the original floppy disk with the machine, but of course they had used it as their main data floppy. I can't be sure what the original state was, but was able to restore two files that are critical for the self demonstration mode. I'll have to make sure none of the - at times very personal - data remains in the deleted sectors before posting that ...


NCR DMV- DEC Rainbow- Siemens PCD- ITT 3030-Oly People- Acorn A5000- Olivetti M20
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