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You are my helper I want to thank you so much for imparting to me.

Does the 7z file already exist?
If so and it is a t7z file, the program 7z will issue an error "data past the end of the file" and abort
<you will not see this error unless you run the version of 7z.exe you are using as a command line window on the archives you are working with>
If you use a specific version of 7z.exe - think is version 7.28, you will not get this error
(if archives are t7z archives.)

Apologies.

Just noticed this board was only regarding arcade games.

No, we've changed and adapted (and the process is still ongoing!)

LCD Handheld info is being "staged"/processed here, for the most part.
https://mamedev.emulab.it/undumped/index.php?title=User:Incog

I've added all Elektronika LCD game info I can find here:
https://mamedev.emulab.it/undumped/index.php?title=User:Incog#LCD_Handhelds_.28Elektronika.29

There's still many other calculators, LED games, etc. but this should be most of the LCD games (in the style of Nintendo Game & Watch).

I added it to here:
https://mamedev.emulab.it/undumped/index.php?title=Undumped_Computers_and_Consoles#Video_Technology_Ltd._.2F_VTech

However, I really don't feel as though it's the right place. It may need its own separate list similar to the "information staging/preparing" we have going over here: https://mamedev.emulab.it/undumped/index.php?title=User:Incog

Added the Putnam Electronics PE6502 to the Undumped Computers and Consoles list:
https://mamedev.emulab.it/undumped/index.php?title=Undumped_Computers_and_Consoles#Putnam_Electronics

As for the Gigatron, I added it... then I removed it, as it is (and has always been) dumped.
https://mamedev.emulab.it/undumped/index.php?title=Undumped_Computers_and_Consoles&diff=135984&oldid=135983

We could possibly emulate both of these in MAME (aside from the PE6502's Propeller interface).

To emulate the Gigatron at the TTL level, we will need a lot more devices added to MAME's netlist library: 74138 (74HCT138), 74139 (74HCT139), 74157 (74HCT157), 74240 (74HCT240), 74244 (74HCT244), 74273 (74HCT273), 74283 (74HCT283), 74377 (74HCT377), 74595 (74HC595), 27C1024, 62256, CD4021... Even if they could all be supported, the simulation could surely not run at the megahertz-plus needed.
So we might need to emulate it at a higher level for now instead.
But it doesn't need to be dumped! It's open-source and ROMs are available. So it does not (yet) have a home at Undumped Wiki. Maybe in the Discrete page, but that's only for arcade games at the moment.

As for the PE6502...
The PE6502 ROM has not been dumped (though it largely uses Apple software). He does not offer it for free, so it would require the purchase of a PE6502.

Even after that - there's the unofficial "3 year rule", and it seems like we might be barely past that in the PE6502's case.

Foone got a VTech Thomas & Friends: Learn & Explore Laptop on the workbench back in August.
https://twitter.com/Foone/status/1165168201799389184
https://twitter.com/Foone/status/1166234722843774976

Unfortunately the MCU has internal ROM and appears to be a raw die blobbed over with epoxy:
https://twitter.com/Foone/status/1165175590795694085/photo/1

It will require decapsulation and more to dump it out, and the CPU core will need to be identified.

buongiorno a tutti mi presento sono Gigi e sto finendo di costruire un cabinato fatto tutto da me....ho un piccolo problema non riesco ad emulare circa 10 giochi ...sara perche uso mameui versione 0.184 e le rom appartengono sicuramnete ad un altro emulatore mame un po piu datato....come posso fare?

Hai 2 possibilità: o passi all'ultimo MAMEUI disponibile (lo 0.215) o cerchi le rom più vecchie. Per sapere quali sono scarichi o crei il dat del tuo MAME, poi le cerchi in rete. Si trovano in giro dei torrent detti "Rollback" con le rom che ora non sono più usate.

Buongiorno a tutti sono Luca e ho 45 anni;sono nuovo del forum e volevo chiedere il vostro aiuto per ritrovare un gioco che dovrebbe risalire al 1985/1986.Scorrimento stile space invaders,mi pare ci fossero delle barriere a protezione della navicella,e i nemici scendevano sempre piu in basso fino ad invaderti.In alto passavano altre navicelle di colore rosso blu e giallo e,se colpite,davano dei potenziamenti,mi pare di ricordare che il rosso era il piu' efficace.La particolarità del gioco era che schiacciando "player 1" potevi cambiare il quadro da affrontare.C'era un trucco che se si schiacciava player 1 mentre il potenziamento raggiungeva l'astronave,questa restava di un grigio cangiante e diventava invulnerabile,tanto che se i nemici ti invadevano,l'unico modo di continuare era spegnere e riaccendere il cabinato.C'era un quadro,difficlissimo,che era fatto solo di "riflettori" cioè delle navicelle che morivano solo se colpite nel centro esatto,diversamente il proiettile tornava giu velocissimo.La grafica per l'epoca era molto buona.Spero di avervi fornito dettagli sufficienti e conto sul vostro aiuto. Grazie !

well...hard to say...the external 7z compression task failed. Does the 7z file already exist? Do you rebuild it to a place where the 7z is already present? Or does the rebuilder try to add it to a new archive?
What are your 7z settings?
If there's a chance can you provide me the datfile and an example file?