STFM Booster 2.3 + Dual TOS Kit, TOS 2.06 Issue

[exxos]

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...

[exxos]

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]

Here is the backside of the booster card:

Tw9nZ9O.jpg (468.61 KiB) Viewed 2069 times

Greets Peter

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

[exxos]

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]

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

5V Line:(*)

V02aFab.png (38.45 KiB) Viewed 2071 times

5V + 12V Line:(*)

0epQexv.png (63.66 KiB) Viewed 2071 times

(*) 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?!

[exxos]

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

[leon22]

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 (243.78 KiB) Viewed 2072 times

Next I will try 8MHz!

[leon22]

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!

[exxos]

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]

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