Re: DRAM chip spacing

From: Jim Brain <*brain_at_jbrain.com*> Date: Sun, 20 Dec 2020 14:16:59 -0600 Message-ID: <066588c8-27a1-b22c-9430-b28aed205056_at_jbrain.com> · brain_at_jbrain.com

On 12/20/2020 1:39 PM, Pasi Lassila wrote:
> Is the 250407 the only one with narrower DRAM chip spacing?
I think so.
> I checked motherboard images from the web. By measuring from the 
> images it looks like it.

You an get full measurements from this project:

https://github.com/go4retro/DRAMCarrier

> I only got 250407 & 250425 8 DRAM chip motherboards.
> I made a new SRAM board which is designed for 466&469. It also works 
> in older models by changing two resistor positions and soldering 6 
> extra wires. With flat pins it also fits 407 if the pins are bent 
> slightly and sockets are leaf spring style.
> https://i.imgur.com/dzmaocY.jpg <https://i.imgur.com/dzmaocY.jpg>
>
> -Pasi

-- 
Jim Brain
brain_at_jbrain.com
www.jbrain.com