exxos's Atari, Amiga & retro forum

I am back ... sorry, LOL

I have a HP1663CS logic analyzer and can provide timing when the STE is not booting.

Where should I connect the CLOCK input pin of the analyzer ?
- on CLK8 from pin 3 of the MCU (U400), pin 15 68000 (U100) ?
- or somewhere on the booster ?


I have connected:
- analyzer input #0 to pin 4 of U405
- analyzer input #1 to end of wire on the booster
- analyzer input #2 to pin 1 of the GAL on the booster

Let me know if other pin input will be nice to have.

Note:
I am using these tutorial to learn the logic analyzer
https://www.youtube.com/watch?v=6w5w3ez ... WM8vCCUzEG
https://www.youtube.com/watch?v=B64jH28 ... EG&index=2

I cant help with the LA stuff.. But not sure if your aware, there a 16mhz clock somewhere to the right of the shifter.. You can actually try soldering the 32mhz there for a test.

Have you tried the original PSU? Your likely not getting very good regulation looking by the long PSU cable you have..

all test where made with a Meanwell RD-50N-R5 and an the original ATARI STE PSU, with the same results, white screen, no booting when the STE is powered for a 'long' time.

I guess I should power up one time a day, or take longer coffee breaks !!!!
LOL

exxos wrote: 15 Feb 2026 23:21 I cant help with the LA stuff.. But not sure if your aware, there a 16mhz clock somewhere to the right of the shifter.. You can actually try soldering the 32mhz there for a test.

Have you tried the original PSU? Your likely not getting very good regulation looking by the long PSU cable you have..

do you mean GST SHIFTER pin 52 (GST MCU pin 2) ?
I cannot found on the PCB, except on the IC packages, but I don't want solder on these really tiny pads.

This is where I took 16mhz off.. Must be a via there.. You would have to check which pin that goes to on the shifter yourself.. I think it was one near the top right somewhere..

exxos wrote: 16 Feb 2026 19:56 This is where I took 16mhz off.. Must be a via there.. You would have to check which pin that goes to on the shifter yourself.. I think it was one near the top right somewhere..


DSCN1538.JPG

confirmed, pin 53, top right minus one pin