What's new
This? Ohhh RAM..... No EPROM...
 

Attachments

  • 16214453654374260571851814227680.jpg
    16214453654374260571851814227680.jpg
    149.5 KB · Views: 90
7B only should be ok, 8 tests ok.

It maybe something nearby but try this first.
 
Indeed, you need the SDIP type - the chip is the same but smaller.
Do you have that kind of RAM? I can't find a realistic price just in China which would take a lot of time to get to me. I would pay you!
 
Sure, PM me your address and i'll send you a couple when i get time ;)
 
Sure, PM me your address and i'll send you a couple when i get time ;)
or should i take it out of this pcb? does not start
 

Attachments

  • IMG_20210520_172712.jpg
    IMG_20210520_172712.jpg
    202.3 KB · Views: 93
  • IMG_20210520_172652.jpg
    IMG_20210520_172652.jpg
    217.1 KB · Views: 98
WWF boot!

The problems with ripping from this board:

1: unknown condition ram, probably no good
2: 2nd hand ram anyway when the board was made (bootleg)

I'm happy to send tested good ram for free but it won't be quick ;)
You dumped the roms with no hesitation = true G and will be looked after!!
 
Old favorite Double Dragon ....

If I don't put the jamma connector on it, the unloaded voltage is 5.29V, if I put on it 4.1V.
The voltage drops a lot, which indicates that something is short-circuited, a quick hint as to where the fault might be?
 

Attachments

  • IMG_20210520_173948.jpg
    IMG_20210520_173948.jpg
    226.1 KB · Views: 88
  • IMG_20210520_174014.jpg
    IMG_20210520_174014.jpg
    180.7 KB · Views: 91
  • IMG_20210520_174020.jpg
    IMG_20210520_174020.jpg
    189.8 KB · Views: 84
if it drops a volt then the bad part is probably pretty warm!
 
Old favorite Double Dragon ....

If I don't put the jamma connector on it, the unloaded voltage is 5.29V, if I put on it 4.1V.
The voltage drops a lot, which indicates that something is short-circuited, a quick hint as to where the fault might be?
In the meantime, it turned out that it is not the PCB that is short-circuited, but my power supply is weak.
I'm replacing
 
Back
Top