Atari ST 72-pin SIMM 4Mb Memory Upgrade

[techie_alison]

*deleted*

Edited January 10, 2007 by techie_alison

[Nick Harlow]

hmm i d on't see your average user doing this, but it is well thought out ... Well Done....

 

 

Nick

[techie_alison]

hmm i d on't see your average user doing this, but it is well thought out ... Well Done....

 

 

Nick

898748[/snapback]

 

Thanks Nick, is nice of you to say so. Is just good to be able to contribute something useful back. All of the ultilities and stuff I've found useful on the net.

 

Aly

[geosteve]

huh ???

I'm glad I bought an STE computer instead, not having to go through all that is well worth it.

[MHend]

I want to do a memory update, but my Mega ST1 has 8 memory chips. How do I have to connect the data/chip lines? There are only 8 connections in stead of 16.

 

Can anyone help me with this.

[nathanallan]

A not-so-harmful way to remove chips that are directly soldered to a board is to hold it over a hot stove and the solder will get soft. I think it's best to use some kind of metal stand so you cab have your hands free. Once you get the chips off get the board away from the stove. And you can use a heat gun and stand, and you still use the metal tray so you can get the heat closer to the area you want to heat and not the whole board. Then you can actually drill the preexisting holes (if there are any) and use the existing solder to connect the wires.

 

Just my $0.02.

 

Nathan

[MHend]

I have found the 16 data/chip lines with a multimeter. I have done it with some help of schematics of a Mega ST and normal ST. I have measured this lines from the 4 (74LS244 and 74LS737) chips (U32, U33, U35 and U36).

 

Can someone tell me if I have found the right connection points? If I understand the schematics well, the data/chip lines lead to the chips I mentioned.

[chaoticjelly]

Where can I get some RAM thats suitable from? I looked on ebay but its all too fast (as described in the doc)

[techie_alison]

I have found the 16 data/chip lines with a multimeter. I have done it with some help of schematics of a Mega ST and normal ST. I have measured this lines from the 4 (74LS244 and 74LS737) chips (U32, U33, U35 and U36).

 

Can someone tell me if I have found the right connection points? If I understand the schematics well, the data/chip lines lead to the chips I mentioned.

 

There's one way to find out Do it!! Sorry not to sound more helpful but alot of it when doing it here was to just chance things, you wouldn't believe the amount of thought that went into the first one when it wouldn't work. I had an ST which wouldn't do anything for a whole weekend, in the end I think it was the old CAS lines I hadn't disconnected from the old ram.

 

Hang on a minute... Isn't there reference to a Stacy 4Mb upgrade in the procedures, I think that was 8 chips, or maybe 16 chips overall, so good for referencing to.

 

http://atari.nvg.org/stacyram/ 8 chips

Edited May 12, 2006 by techie_alison