LarryL - another Raven060 Adventure

[LarryL]

Hi,

#3 is also working

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After returning from my business trip I found the CPU in the post box.
Fired it up today and all is working fine
Only one of my remaining 68150FN40 is stable, the other two let the system freeze after a few minutes.
Anyway, one is enough

Tested with 32 and 48Mhz and x1 and x2

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@agranlund I assume, this is S/N #16 now - right?

[agranlund]

@agranlund I assume, this is S/N #16 now - right?

That's incredible!
Yep, that should be #16

[LarryL]

Hi,

Although suffering a bit from a flu (my wife caught Covid again, so maybe I have it, too…) I managed to get Raven #17 up and running

I did not plan to build this one myself, but one of my friends „gave up“ after soldering the first few components, so I completed this board, too.

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This one is having just a rev5 CPU and a 68150FN33 - so, I have to experiment a bit, finding the best clock setup…

But for this one we will try with a kind of special VGA card, having two ET4000/w32 Chips…
Lets see - doing my first tests with a standard AX, though.

Cheers
Michael

[agranlund]

I managed to get Raven #17 up and running

Wow, Germany is now well ahead in number of Ravens

This one is having just a rev5 CPU and a 68150FN33 - so, I have to experiment a bit, finding the best clock setup…

Oh, I've implemented a rev1/5 cpu bug workaround in the lastest rom code (but I haven't yet rebuilt a new release package).

I'm not sure if Atari TOS or programs are affected much or at all, but according to Motorolas Errata document some certain sequence of instructions can produce the wrong result on Rev1 and 5 cpus. One recommended workaround for that bug was to disable load-store bypass so I'm doing that when detecting those revs.

(The way team Amiga handles this issue is more elegant and at some point I should copy that approach.
Instead of deciding based on cpu revision they apparently run a piece of code known to provoke the issue and checks if the result is correct or not)

[LarryL]

I managed to get Raven #17 up and running

Wow, Germany is now well ahead in number of Ravens

This one is having just a rev5 CPU and a 68150FN33 - so, I have to experiment a bit, finding the best clock setup…

Oh, I've implemented a cpu bug workaround in the lastest rom code (but I haven't yet rebuilt a new release package).

I'm not sure if Atari TOS or programs are affected much or at all, but according to Motorolas Errata document some certain sequence of instructions can produce the wrong result on Rev1 and 5 cpus. One recommended workaround for that bug was to disable load-store bypass so I'm doing that when detecting those revs.

(The way team Amiga handles this issue is more elegant and at some point I should copy that approach.
Instead of deciding based on cpu revision they apparently run a piece of code known to provoke the issue and checks if the result is correct or not)

Oh, didn’t know that this is a competition - thought it’s pure fun

Cool idea, to implement a workaround for such bugs!

Few observations during my first tests with this board:
Although there is a 68150FN33 fitted, it only works with 40MHz OSC, not with 32MHz… strange…
With 32MHz I have always freezes during the first three Gembench tests
Regardless, if I use x1 or x2 clock
With 40MHz the system is stable running Gembench for a while
Interestingly, the results are pretty much the same in x1 and x2 mode… also strange…
…and with 25MHz the system is not starting at all - same like with the other boards
I haven’t tried 48MHz yet…