ST rev H & agranlund ram troubleshoot (solved)

[PhilC]

@exxos yeah that's what I thought but nope, had to swap the two over, otherwise the byte order got swapped.

[exxos]

@exxos yeah that's what I thought but nope, had to swap the two over, otherwise the byte order got swapped.

Doesn't make sense as BANK 0 is basically the same and that would mean that would have to be swapped as well :stars:

[exxos]

Can someone check the highlighted pin does actually go to MMU pin 6 on the MMU...

Capture.PNG

[Steve]

@exxos I tried buzzing it today and no it doesn't.

[exxos]

@exxos I tried buzzing it today and no it doesn't.

Thanks,, just sure it be be going by 68R maybe.

It could be the issue., not that cas1 lines are wrong , the ones on the PCB are wrong...

[dragmar]

@Steve you managed to run 4MB ram from @agranlund. I started the assembly but I can't start it properly

[PhilC]

@Steve you managed to run 4MB ram from @agranlund. I started the assembly but I can't start it properly

What is it you need to know?

[dragmar]

I have everything soldered according to https://github.com/agranlund/STRam

Do I have to make a mod for 4MB to work properly?

Is it enough to do as described by @agranlund

[PhilC]

@dragmar yes, remove all the ram first, then install the ram board and then connect up the wires but note that CAS1H and CAS1L are incorrect and need be swapped over.

[DoG]

Here is the changed EAGLE files and Gerber files made out of it. Bodge wire is not needed and swapped CAS1L and CAS1H on the silkscreen. Read README2.TXT for full info. Board tested and working.

I have included:
The Original github zip.
Photos of the board from Christian Zietz.
Schematics.
My changes above.^^

STRam4mb.rar