I might be able to try it on my Falcon tomorrow if that is any help?
It'd have to work on VGA (as I still haven't found the Falcon monitor port ->13 pin Atari adaptor yet)

Elements of this look very similar to using the NXP PCF8563 RTC that we use in our products... except that only uses BCD. :( It has the same issues with upper (unused) bits in some registers reporting seemingly random values as the seconds/minutes values change. What really makes it a complete swine...

There are a few snippets for the ST-specifics on there (under the atarist.php page on that site). I won't be able to find it tonight but I do have ("somewhere safe") another guide to assembler on the ST which I vaguely remember as being pretty good. Though it might have been as long ago as the mid-l...

Hi,

If you're OK with a non-platform specific guide then I stumbled across this http://www.chibiakumas.com/68000/
Might get you started with the basics before you get into the platform-dependent stuff.

Enjoy!

My Mega 4 has an ASPF34/2 fitted so I'd suggest you check before ordering any bits.
HTH.
Jez

I think I'm definitely part of the 10%

Welcome on board. Always found them to be a friendly and helpful bunch here.

Trying to make/find the time and money to fix my Falcon and numerous STF/STFM & Mega4.

Nooooo - my OCD has kicked in with the one in the bottom row in the opposite orientation than the others.

Must not give in to the urge to fix it...

Better start saving up for one of these as well...

Hmm, sounds like what I really want is a build with the same image size as the cart version but as a replacement for the existing TOS ROMs. Then I could program up the 27c512s and replace the existing ROMs to diagnose & fix the faults, then re-fit the original ROMs or even upgrade to 1.04 at some po...

Thanks for the reply. When I downloaded the binaries for the ST they appeared to be just too big to fit in a pair of 27c512 - probably just a few K with a couple of strings and a couple of blocks of constant data values so I was hoping there might be a smaller image that would fit in the pair of 512...