Chip identification

[TheDaddy]

I feel i am gng to make a dick of myself here but anyone know what this is :-



48100686 - 8624

I assume it ram ??

Dave.

 

[Georgian2]

What PCB is that? most likely 32kx8 sram
https://www.agilent.com/store/en_US/Prod-5025-0168/5025-0168
EDIT: not enough pins for an 32k x8

 

[Ace`]

Bootleg replacement of the sega custom chip 315-5025

 

[Georgian2]

74HCT356N and cut the lower 2 pins.

 

[TheDaddy]

Ah super , Yeh they are cut on mine too. So LS356 good as well looking at schems , Thanks !

Oh its a bootleg wonderboy

Dave.

 

[TheDaddy]

Next problem ........ Finding one !

Check every spare board and draws and nothing.

Dave.

 

[patzik]

74HCT356N and cut the lower 2 pins.
View attachment 33589

74HCT356N and cut the lower 2 pins.
View attachment 33589

can you explain this one to me? How is this supposed to work? Cutting the bottom 2 pins removes the ground connection of the chip so it would not do anything right? Interested because I have some wonderboy bootlegs that have the daughterboard instead of these 3 5025’s but this creates a graphical glitch.

 

[patzik]

Looks like these are 315-5155, these are sometimes used with the bottom 2 legs folded and connected to each other.

 

[TheDaddy]

can you explain this one to me? How is this supposed to work? Cutting the bottom 2 pins removes the ground connection of the chip so it would not do anything right? Interested because I have some wonderboy bootlegs that have the daughterboard instead of these 3 5025’s but this creates a graphical glitch.

Nope !

Dave.

 

[Retroman839]

Did you find any ?

 

[TheDaddy]

Did you find any ?

Another i not had chance to revisit mate. Have weird graphics glitch.

Dave.

 

[Retroman839]

Another i not had chance to revisit mate. Have weird graphics glitch.

Dave.

Argh .. I will look for them on a shinobi boot leg I have.
The shinobi boots to garbled

 

[Retroman839]

Also I have a phsycadelic bombjack.

I have been unable to do anything for few weeks ..
Got some stuff in my eyes at work! I think it was plaster dust and metal fillings.

Seeing double,
Slowly getting better

 

[TheDaddy]

Also I have a phsycadelic bombjack.

I have been unable to do anything for few weeks ..
Got some stuff in my eyes at work! I think it was plaster dust and metal fillings.

Seeing double

I got metal in my eye soldering and the film grew over it as left it a day, had to have an oporation on my eye ! Awful !

Dave

 

[Retroman839]

I got metal in my eye soldering and the film grew over it as left it a day, had to have an oporation on my eye ! Awful !

Dave

Blimey ..
Hope I don’t need that ..

 

[Retroman839]

I will get it look at asap ..
Kind wishing it just cures it’s self

 

[Retroman839]

My grandad working metal lathe for years ..
Twice yearly under electro magnets to pull metal outta his eyes.

Silver solder Tungsten carbide coal face pic arms

 

[GadgetFreak]

74HCT356N and cut the lower 2 pins.
View attachment 33589

Ah super , Yeh they are cut on mine too. So LS356 good as well looking at schems , Thanks !

Oh its a bootleg wonderboy

Dave.

No Chance of that working! A 74HCT356 has a Clk pin on pin 9 so grounding it will not ever shift data and as already pointed out the ground pin is not connected.
They are custom Sega shifters.

 

[Lurch666]

That's the puzzling bit.
LS356 have been used on a PCB that way as shown in the picture posted by Georgian2 yet I can see no way they are working without GND or CLK.

 

[Georgian2]

Chip "takes" gnd from other pin. I forgot how is this called but I'll check it up. I didn't make the bootleg.