STE 32MHz PLUG IN BOOSTER (again) 2021 variation

[HigashiJun]

You have only two grounds on the CPU (pins 16 & 17)...

[exxos]

Prob a daft question but should each header pin not have connection to the next or are there grounds next to each other. I fear not. Time to resolder I fear

Only VCC and GND

Capture.PNG

[philbo34]

Cheers that halved it

[HigashiJun]

You have only two grounds on the CPU (pins 16 & 17)...

Oops...

Forgot pins 56 & 57...

My bad !

:oops:

[HigashiJun]

Ok, so Exxos' new plug-in beta booster now sits in the CPU socket:

Booster.jpeg

And guess what ?

My STE boots flawlessly and even from Ultrasatan:

STE.jpeg

As for now, I did not revert to originals SILs and still have the 2.2 K ones soldered in.

No need either to use the 22uf capacitor in case the machine refuses to boot.

I will try to check if the floppy works.

Just funny to see that Sysinfo reports the CPU speed as 10 Mhz...

:D

[sporniket]

good work :)

[HigashiJun]

good work :)

Thanks !

This one was a lot easier than my previous booster attempt...

:D

[exxos]

As for now, I did not revert to originals SILs and still have the 2.2 K ones soldered in.

You should remove the MB ones as you will have 1.1K pullups in total , I found that can cause DMA issues on some machines.

No need either to use the 22uf capacitor in case the machine refuses to boot.

You still need it, or recap the reset circuit...

Just funny to see that Sysinfo reports the CPU speed as 10 Mhz...

Not surprised, effective speed, like 20% I guess overall. But ROM will work at much higher speeds, so desktop and apps will fly!


:bravo: :goodpost:

[DoG]

...Just funny to see that Sysinfo reports the CPU speed as 10 Mhz...

Sysinfo don't display correct CPU speed. I don't know how it calculated it. It always seems off if you have an accelerator running.

[HigashiJun]

And, to conclude this day of hard labour:

FDD.jpeg

This old good floppy also works...

I will have to try some transfers between FDD and Ultrasatan to check if everything is alright and if there is no any data corruption, then launch Gembench...

But it will be for another day.

Stay tuned.