TT-RAM upgrade with CA401059

[+slx]

My Atari TT has a "new type" CA401059-001 Rev B ST RAM card with 2MB (16x TCS514256AJ-10) RAM. There are several instructions around the web saying that the CA401059 can be upgraded to 8MB ST-RAM by just changing the chips and setting the jumpers.

 

As these are SMD chips and I am not a soldering wizard I wonder if this can be accomplished with a soldering station with a fine tip and a handheld vacuum pump or if special equipment is required.

 

If it's the former, where would I get the required 16 4MBit chips in the correct form factor?

[guus.assmann]

The correct replacements can be found on 30 pins PC memory's. But also on the 72 pin modules.

It's just a bit difficult to remove them without hot air soldering stuff.

But an electrical paint stripper may do just fine.

 

Removing the chips from the Atari card is simpler. Just use a sharp knife to cut all pinns next to the IC housing.

And remove the pins from the PCB with a normal soldering iron.

The replacement chips can be soldered in place easilly enough.

 

I´ve done several boards and had none fail yet.

 

BR

Guus

[+slx]

Thanks for your help!

 

Does it matter whether the modules are EDO or FPM? It doesn't seem to matter for the TT-RAM board modules (at least mine). Maybe I can borrow the hot air soldering thingy. Is there a danger of overheating the modules themselves with a hot air paint stripper?

[guus.assmann]

As long as the IC types are ok, it's no problem.

 

Theoretically, the chips can be over heated. But practically I've never had a problem.

As long as the solder melts on both sides, it's good.

And it can be done without specialised stuff.

[Lynxman]

I have some new never used Chips. I send you a PM.