exxos's DFB1 trials

[exxos]

@Badwolf

I grabbed your flash tool from your github. Though it seems to crash when says erasing flash ?

I had to use the jumper link on the board to disable the flash to allow me to boot, so I assume that is the correct way of going about it ? and it doesn't actually disable the flash from being erased as well ?

EDIT:

OK so it seems use the DISABLE jumper then use the flash tool

Needs error checking for idiots which do it as I did originally

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[exxos]

Now running from flash

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So let me do some mathematical guesswork here...

STE booster 368% at 32MHz.
368% / 2 = 184% (16MHz)

FALCON 100% at 16MHz.
Now 176%.

So pretty close I guess. Though the flash is 70ns not 55ns like on the STE booster.

327% (based against 8MHz STE) ROM Speed with CPU cache.
268% (based against 8MHz STE) ROM Speed without CPU cache

I guess working it out per clock cycle at 50MHz = 20ns

1 clock ) 20 ns
2 clock ) 40 ns
3 clock ) 60 ns
4 clock ) 80 ns

I think BW has it set to "4" so I guess 3 might work as it probably takes the CPU a cycle to latch the data anyway

Lets try it anyway..

Computer says... "M"

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[exxos]

50MHz with MAPROM

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[stephen_usher]

It's just thinking about it. It didn't say "No"

[exxos]

Next problem is that MAPROM doesn't seem to like being loaded from AUTO

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[exxos]

Next with NVDI. Though I had to load NVDI first and then MAPROM from desktop. So I assume NVDI is running from ST RAM not alt-ram

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I think my monitor might be dying as it keeps losing sync

So this is with AUTO booted older version of MAPROM & NVDI.

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[stephen_usher]

That's all looking very promising.

Of course it's the demos which trip things up as they push the system to the limit. I seem to remember that they were what showed up incompatibilities on the original board.

[exxos]

That's all looking very promising.

Of course it's the demos which trip things up as they push the system to the limit. I seem to remember that they were what showed up incompatibilities on the original board.

I think BadMood might be a good test. But I haven't been able to get my SD card to work on my PC and Falcon. So I am stuck with floppies for transferring data over

Of course if there is any demos which will fit on a floppy I will gladly give them a try. But if there are problems, its likely going to be beyond my scope of diagnosing such problems. Currently it will pass FPU, GB6, YAARTTT perfectly well. That's about all I can do here. As far as I concerned it is a lot more stable than the original and basically just have to get them tested and in store now really.

[exxos]

Just hit 100 passes on GB6. It's been running GB6 with alt-ram and NVDI just fine. All at 50MHz CPU & FPU. Seems stable to me

[Atari74user]

Encouraging, good work!