STFM Booster 2.3 + Dual TOS Kit, TOS 2.06 Issue

leon22 · Post by **leon22** » Sun Jan 20, 2019 8:09 pm

exxos wrote: Wed Jan 16, 2019 6:45 pm
leon22 wrote: Wed Jan 16, 2019 6:39 pm No I mean TOS104 (sorry for the typo)! So I can boot in 16MHz + 8MHz mode to TOS104 and never to TOS206!
The only possible modification is wiring a 68R resistor in series with ROM CE to the dualtos board as I have seen issues there recently.

You probably would have to send me your motherboard to diagnose the issue because it's not a fault I have seen before. There's no difference really between 16MHz TOS104 or TOS206.

Can you please clarify the suggested resistor connection on the PCB?! (image)

Thank you!

PS: I also cut the wires -> same result
PPS: will post the 16MHz signal soon

Post by **exxos** » Sun Jan 20, 2019 9:02 pm

The wire which goes to the ROM board, place 68R resistor in series with that wire.

leon22 · Post by **leon22** » Sun Jan 20, 2019 9:08 pm

exxos wrote: Sun Jan 20, 2019 9:02 pm The wire which goes to the ROM board, place 68R resistor in series with that wire.

I interpreted it right!

Also tried this -> same result!

Post by **exxos** » Sun Jan 20, 2019 9:10 pm

leon22 wrote: Sun Jan 20, 2019 9:08 pm I interpreted it right! Also tried this -> same result!

OK, so need to see the 16MHz waveform output from the shifter pin 39, to pin 1 on the GAL top right of the booster PCB.

Post by **exxos** » Sun Jan 20, 2019 10:05 pm

Also, what floppy drive are you using exactly ? and have you tried a different one ?

Also when it bombs, what happens if you press reset on the back of the ST, does it bomb again ?

leon22 · Post by **leon22** » Mon Jan 21, 2019 6:53 am

exxos wrote: Sun Jan 20, 2019 9:10 pm
leon22 wrote: Sun Jan 20, 2019 9:08 pm I interpreted it right! Also tried this -> same result!
OK, so need to see the 16MHz waveform output from the shifter pin 39, to pin 1 on the GAL top right of the booster PCB.

Ok, here is the 16MHz signal:

: YDfBNm8.png (42.41 KiB) Viewed 1591 times

Post by **exxos** » Mon Jan 21, 2019 10:21 am

Where are you measuring it ?

leon22 · Post by **leon22** » Mon Jan 21, 2019 1:00 pm

exxos wrote: Mon Jan 21, 2019 10:21 am Where are you measuring it ?

On Pin39 of the Shifter IC as suggested!

Post by **exxos** » Mon Jan 21, 2019 1:23 pm

leon22 wrote: Mon Jan 21, 2019 1:00 pm On Pin39 of the Shifter IC as suggested!

You haven't read my post fully as I asked for 2 readings... https://www.exxosforum.co.uk/forum/viewt ... 068#p17044

leon22 · Post by **leon22** » Mon Jan 21, 2019 2:07 pm

exxos wrote: Mon Jan 21, 2019 1:23 pm
leon22 wrote: Mon Jan 21, 2019 1:00 pm On Pin39 of the Shifter IC as suggested!
You haven't read my post fully as I asked for 2 readings... https://www.exxosforum.co.uk/forum/viewt ... 068#p17044

You are right,sorry!

My test setup:

: VPspgFk.jpg (318.38 KiB) Viewed 1590 times

Signals (Line 1 Pin39 Shifter IC, Line 2 Booster PCB):

: g66q4km.png (60.94 KiB) Viewed 1590 times

Greets Peter

STFM Booster 2.3 + Dual TOS Kit, TOS 2.06 Issue

Re: STFM Booster 2.3 + Dual TOS Kit, TOS 2.06 Issue

Re: STFM Booster 2.3 + Dual TOS Kit, TOS 2.06 Issue

Re: STFM Booster 2.3 + Dual TOS Kit, TOS 2.06 Issue

Re: STFM Booster 2.3 + Dual TOS Kit, TOS 2.06 Issue

Re: STFM Booster 2.3 + Dual TOS Kit, TOS 2.06 Issue

Re: STFM Booster 2.3 + Dual TOS Kit, TOS 2.06 Issue

Re: STFM Booster 2.3 + Dual TOS Kit, TOS 2.06 Issue

Re: STFM Booster 2.3 + Dual TOS Kit, TOS 2.06 Issue

Re: STFM Booster 2.3 + Dual TOS Kit, TOS 2.06 Issue

Re: STFM Booster 2.3 + Dual TOS Kit, TOS 2.06 Issue