What's new
By:
Filters

Namco system 1 eprom chip identification / type

P

peet

Student
Joined
Nov 20, 2019
Messages
58
Reaction score
13
Location
Newcastle
Hi, I am trying to fix a namco system 1 board. Currently if I put it in test mode it loads to a black screen with 3 clicks from the speaker. I want to check all the roms. I can read some of the roms in my reader but some I can’t identify. They have the following number on them:

MN231001NZZ (used at position PRG-6 for example)

thanks
 
Are the devices 28 pin?if yes, they are 1Mbit MASK ROM with non-JEDEC pinout.You can read them as 27C010 but you have to use an adapter to swap /OE and A16.

P.S.

Yes, they are 28 pin 1Mbit MASK ROMs, I attach datasheet.
 

Attachments

  • MN231001.pdf
    163.2 KB · Views: 92
Thank you very much! I am getting what looks like a Ram1 error with code 0001 after it when booting in test mode. Do you know where I can buy these (position B2, Toshiba TMM2064P-70)? I can find TMM2064P-10 but not sure that will be compatible?
 
that would have worked if the sale wasnt ended! :)
always use good turned-pin / machined-pin sockets incase you need to change it again.
 
Tha
stj said:
that would have worked if the sale wasnt ended! :)
always use good turned-pin / machined-pin sockets incase you need to change it again.
Click to expand...
Thanks stj. I bought the last 4 they had :)
 
if you were going to spend that kind of money then you could have got the ram and sockets from RS
 
stj said:
if you were going to spend that kind of money then you could have got the ram and sockets from RS
Click to expand...
Ah, I didn’t have a clue where to buy them. You live and learn. Thanks for the heads up.
 
@stj for future reference which SRAM and sockets would you get from RS? I can find

AS6C6264-55 but not -70. Not sure if that makes a huge difference?​

 
the number at the end of the sram is the maximum speed it can be run in inverse format.
so 55 is faster than 70 and so not a problem, lower numbers are better.

yes, the one you linked looks very nice.
 
stj said:
the number at the end of the sram is the maximum speed it can be run in inverse format.
so 55 is faster than 70 and so not a problem, lower numbers are better.

yes, the one you linked looks very nice.
Click to expand...
Thank you very much, that’s really helpful.
 
You must log in or register to reply here.
Back
Top