I can't figure out what the "AA" part is in the part number such as here...

https://www.newark.com/nxp/mc68sec000aa ... =AFC-SF-FC

In the pdf's they list FU, but whats AA ?!

The good news is TOS206 is now working at 75Mhz. The bad news is.. this may need water cooling


EDIT:

Now pushing ROM over its limits

IngoQ wrote: ↑

Thu Jan 23, 2020 2:45 pm

Holy shit... This reminds me a little of the good old 486DX/4 days... only that yours would be a 68000DX10 by now

Need to find a 80Mhz osc next

PhilC wrote: ↑

Thu Jan 23, 2020 2:07 pm

I saw that but thought Nah, that a normal exxos circuit

TOS206 *almost* got there at 75Mhz that time... I simply added a 1.5K pull up on RESET... So at least its actually trying to boot now!

DoG wrote: ↑

Thu Jan 23, 2020 1:53 pm

Crystal shoved in the dual-TOS socket?

rubber_jonnie wrote: ↑

Thu Jan 23, 2020 1:47 pm

Guessing it's something to do with the crystal on top of th MMU?

Keep pressing and guessing

EDIT

Will add it does boot up to a crash screen in emutos after displaying the logo..

Lets see who can spot it

@btl ? I might have missed some posts in the mix of it all...