exxos's Atari, Amiga & retro forum

My ram works fine, so yours should do but Ive not got round to testing my floppy interface yet.

PhilC wrote: 21 Sep 2026 14:21 My ram works fine, so yours should do but Ive not got round to testing my floppy interface yet.

I've just got to wire up EXP2 to the board and we should be good to do, hopefully later.

@PhilC

OK so I'm wired up and connected but I'm getting 64KB OK and 512KB as bad on bootup.

I notice that unlike the board @stephen_usher installed, the one you sent me has a jumper, but I can't find if that requires connecting or not.

Any advise you can offer?

@rubber_jonnie I didn't use a jumper afaik.

Here's the pic of my install if it helps. You do have the upgraded tom installed as well right?

Note that with the DuPont connectors on EXT2 you'll have trouble putting the case on as there's no enough clearance. I soldered the wires on, as Enterprise did for the 128.

stephen_usher wrote: 21 Sep 2026 17:36 Note that with the DuPont connectors on EXT2 you'll have trouble putting the case on as there's no enough clearance. I soldered the wires on, as Enterprise did for the 128.

I agree, that's why I bent the headers on the ram board over and then soldered the wires on.

It's more the side of the case doesn't have enough clearance between it and the EXT2 holes on the motherboard.

I'd be curious about one of these RAM boards... is it simply a 64Kbyte upgrade making 128Kbyte or a newer one which adds 1MB or more?

alexh wrote: 21 Sep 2026 18:21 I'd be curious about one of these RAM boards... is it simply a 64Kbyte upgrade making 128Kbyte or a newer one which adds 1MB or more?

It adds 512k. Are you going to CL5? I'll try and remember to bring a PCB if so.

PhilC wrote: 21 Sep 2026 17:23 @rubber_jonnie I didn't use a jumper afaik.

Here's the pic of my install if it helps. You do have the upgraded tom installed as well right?

PXL_20260806_145746130.jpg

I have EXOS 2.04 installed with the lifted leg/bodgewire mod. Is that what you're using? When I boot the test screen prior to the flashing Enterprise logo it states 64KB good and 512KB bad, so either a RAM issue, connection issue (I connected as per here: Connection guide

The Stupid Humans GitHub stated the wiring was the same.

I will cross check mine against yours.

@stephen_usher
@PhilC

Yes, I'd figured that the DuPont's would be too tall, but I was keen to test it out, so rest assured once I'm happy with it, I will be revising it for something that will fit in the case.