STFM Booster 2.3 + Dual TOS Kit, TOS 2.06 Issue

Post by **exxos** » 14 Jan 2019 20:34

I edited my previous post...

I started fitting a resistor pull-up on the boards at some point, but I don't know if your board has that or not... you would measure maybe 1K from the pin to 5V.. in that case its OK to leave the grey wire disconnected...

In anycase, if you wire to 0V it will enable 8MHz mode...

Post by **exxos** » 14 Jan 2019 20:41

Also can you measure the voltage on 5V on your PSU ? IF you have a scope that would be better to see the ripple on it.

It looks like you have a SR98, so you could also try adjusting the trimmer pot to get proper 5V output. It is likely to low due to age etc

leon22 · Post by **leon22** » 14 Jan 2019 20:57

Here is the backside of the booster card:

Tw9nZ9O.jpg

Greets Peter

PS: I will check the voltage and report it here!

Post by **exxos** » 14 Jan 2019 20:59

leon22 wrote: 14 Jan 2019 20:57 Here is the backside of the booster card:
PS: I will check the voltage and report it here!

OK, so it has the resistor on that board then.

As I said before, clean all the pins with IPA... Just because they all look clean doesn't mean they are.

leon22 · Post by **leon22** » 16 Jan 2019 17:43

OK, all Pins are cleaned with IPA and I also did some tests with the PSU:

5V Line:(*)

V02aFab.png

5V + 12V Line:(*)

0epQexv.png

(*) under load

It looks good to me or what do you think?!

I also measured the voltage on floppy drive: 11.96V + 5.04V -> maybe the motor of the drive has some issues?!

Post by **exxos** » 16 Jan 2019 17:46

Have you tried 8MHz ? Also check the 16MHz line on the booster PCB and post a screenshot of that.

leon22 · Post by **leon22** » 16 Jan 2019 17:58

We can definitely remove the PSU from failure list! I tested it also with external 5V+12V Line and have
the same behaviour:

dx4VGCF.jpg

Next I will try 8MHz!

leon22 · Post by **leon22** » 16 Jan 2019 18:21

Same with 8MHz wire connected to 0V!

Connected wires in this scenario:

- ROM Select
- 16MHz
- 8MHz

I will also test 16MHz on booster PCB tomorrow when I have a scope for that!

Post by **exxos** » 16 Jan 2019 18:22

leon22 wrote: 16 Jan 2019 17:58 We can definitely remove the PSU from failure list! I tested it also with external 5V+12V Line and have
the same behaviour:

Next I will try 8MHz!

But its not crashed that time ?!

leon22 · Post by **leon22** » 16 Jan 2019 18:25

exxos wrote: 16 Jan 2019 18:22
leon22 wrote: 16 Jan 2019 17:58 We can definitely remove the PSU from failure list! I tested it also with external 5V+12V Line and have
the same behaviour:

Next I will try 8MHz!
But its not crashed that time ?!

Not that time, only when the progress bar has finished!

PS: 8MHz mode also works with TOS 1.06

exxos's Atari, Amiga & retro forum

STFM Booster 2.3 + Dual TOS Kit, TOS 2.06 Issue

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