exxos's Atari, Amiga & retro forum

I have a nice 520ST with TOS 1.04 that I'd like to upgrade the memory on.

I plan on using the Exxos ST/F/M / MEGA ST-RAM 4MB UPGRADE [0035] upgrade, but am lost as to which of the 3 cables I should get.

I'm attaching a pic of my motherboard so that layout can be seen. Any advice would be appreciated. Thanks!

Locate the MMU, which as I recall is the furthest left PLCC socket on your mainboard, and measure the distance to the Shifter which is in the tin can on the right hand side, then use that measurement to judge the cable size you need, without the cable being under tension when installed.

20cm cable most likely.

http://www.spiny.org/atari/photos/exxos ... .20.02.jpg

As it happens, I will probably be upgrading mine later today.

I have a 30cm cable as it was originally intended for one of my Megas, which I got fixed, so I can confirm if it's longer than you need.

I'd suspect as @exxos says, 20cm is going to be enough.

Just opened mine up, 20 cm it is.

This is it fitted to mine with a 30cm cable, once again confirming the 20cm option.

I did remember the MMU position incorrectly though, it's the chip here you can see the MMU adaptor on top of (Unsurprisingly!), the other, towards the left, being the GLUE.

Awesome, great info. Thanks everyone!

Colleton wrote: 03 May 2020 13:26 Awesome, great info. Thanks everyone!

No problem and good luck.

Received the 4MB MMU ram upgrade this weekend, and got it installed in my 520ST this afternoon. Everything went very smoothly, no problems at all.

Also installed a blitter in my STFM. It was a busy day today.

Colleton wrote: 18 May 2020 04:33 Received the 4MB MMU ram upgrade this weekend, and got it installed in my 520ST this afternoon. Everything went very smoothly, no problems at all.

Also installed a blitter in my STFM. It was a busy day today.

Good job sir, it's a very nice upgrade.