exxos's Atari, Amiga & retro forum

To be fair - i'm not a professional by any means - just an enthusiastic hobbyist! I'm looking forward to the day when i turn on the SE and hear 'BOOOOP' followed by the '?' prompt flashing away. I had a few other ideas, such as doing something similar to the Classic ROM - where you have System 6.0.8 in ROM, and then there's the other project of 'can we get the TF520 working on this, through the PDS slot...'

OK - after posting out several of the Rev 1.4c's - i have 6 left - would anyone here like one to build up and test? :)

Incredible work! I am impressed to say the least. Did these last batches work for you yet? I have been waiting to see some news since your last post about them no longer being shorted!

This is pretty awesome, and what I'm thinking here is that it would in theory be possible to do the same thing for the Mac Classic. Unless of course it's been done already?

Out of curiosity @Kai Robinson , would the SE board fit in a Classic chassis for a sleeper machine?

The closest I've done to this was reverse engineer the "Dunkirk" VLSI chip on the Mac Portable 1MB SRAM upgrade card.

The card was sold to me as working on eBay but something reallt bad had happened and every chip which was bus facing was dead! Thankfully the SRAM was fine but it was 'fun' reverse engineering the custom chip. Thankfully it was only really an address decode and bus access control chip so a multiplexer and GAL were all that were needed.

@rubber_jonnie Actually, funny you should mention the classic...


I got a little bored waiting for parts for the SE project :D

@Acill well, i discovered that on the PDS connector, /AS and A8 were bridged, so i've corrected that - but i'm seeing now that i'm stuck in a RESET loop - RESET doesn't stay High, and one of the 74F257's is being a bit...wierd. So i've stopped for the moment - i had to tody the hobby kit today on the mrs insistence we have to be able to see the carpet, bed, table, chairs and cupboards, rather than just assume they exist behind a wall of equipment :lol:

I've tested the ROM's work, the BBU works, and yes, the classic's BBU is 1:1 compatible with the SE, too.

@stephen_usher Ooooh! Is that available as open source anywhere? The folks over at 68k MLA would love to get their hands on it!

@Kai Robinson Oooh, nice!

@rubber_jonnie

I have a box for the class board ready to ship if you can pm your address its going out in a bulk shipment

Tom

@Kai Robinson

Have you goto the floppy ic figured out

Tom

Kai Robinson wrote: 17 Jan 2021 22:48 @stephen_usher Ooooh! Is that available as open source anywhere? The folks over at 68k MLA would love to get their hands on it!

I did post on there about my project.

I'd have to clean up the KiCAD files before I can post it as I made a minor mistake which required a bodge wire. This was mostly because it was my first KiCAD project and I made a major mistake in how I used the tool.