BTW, that picture is really strange. The bombs are perfectly clean and stable, which means that the Shifter works well. But I can' figure where the strange background could come from... Yes it is strange but actually quite pretty I've pondered it for a while. Either the RAM contents* change from 0s...

Text output on screen or over serial?

Bus error loop?

So, apparently it's possible to join the group without consent. All the better :) But, I can't seem to find anything pointing to your model. Did you use "+ POST A THING" inside the group and then select one of your own public models? I don't seem to have that option. I did use "Share...

For convenience, we try to maintain the 3D models in this forum on Thingiverse. https://www.thingiverse.com/groups/atari-st-parts/things Just leave a message if you want to become a member, which would allow you to upload models to the Thingiverse group. afaik I've joined the group and then chosed ...

Well we've seen bombs. That means, I believe, CPU is working, GLUE is working, MMU is working, Shifter is working.

exxos wrote: ↑Tue Sep 18, 2018 7:18 pm

Icky wrote: ↑Tue Sep 18, 2018 7:17 pm Great fun - just been hunting for 2.2k resistors in my parts bins. None to be found time to start desoldering some from that donor ST I have.

4.7K, 10K should be ok as well...

Get a SIL array from the donor - they're 10 or 4.7k

exxos wrote: ↑Tue Sep 18, 2018 7:17 pm Would be all zeros for black though wouldn't it ?

No, think palette. Color 0 is white (border color) and color 15 (low res) is black. So, if all bitplanes are 1s the "graphics" is an image of all palette color 15 = black.

Unless I'm not thinking straight. Have a fever.

exxos wrote: ↑Mon Sep 17, 2018 11:05 pm It sparked my interest as if 50Hz is being set, but not the palette data (still black screen) what actually goes on in the code between those 2 things ?

Actually a white border and black screen would indicate all 1s being read from RAM, I think.