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Coolexxos wrote: 27 Oct 2023 15:20 I've done some more tests with newer motherboards (001A DMA integrated blitter) , all 3 boards give the expected diagonal pattern. Ill write more in the other thread. viewtopic.php?f=23&t=4797
I just noticed this ^^DementED wrote: 14 Jun 2023 22:52
I did not replace the pull up resistors on the motherboard (which are the original values) because the booster board has "472" stamped on the resistor packs.
Interesting. I see you've got the 588 shifter, so maybe that helped.Steve wrote: 28 Oct 2023 12:05 Ok I opened up my STe which has the 32mhz booster just to see what I've done:
At some point I must have decided to use shielded Ethernet cable for the booster 32mhz line:
PXL_20231028_105427498.jpg
Here you can see the end of the cable, the 32mhz line going to the IC and the shielding wire being soldered to the GND part of the motherboard:
PXL_20231028_105526097.jpg
I also have the 32mhz stability board installed. I installed mine without having to cut any tracks, by lifting the 32mhz pin in the socket (thus disconnecting it from the motherboard) and soldering the 32mhz input to the PCB directly to the 558 Glue chip. Then the output goes to that Via. The other two wires go to positive/negative voltage points on the motherboard.
PXL_20231028_105546954.jpg
But just to clarify: The 32mhz stability board was not required for my STe to get stable video output, it already had stable video output (probably thanks to my shielded cable) the little 32mhz PCB fixed some demos which were blitter heavy, which previously would not work. I think it basically stopped the blitter crashing.
The instructions said it was fine to leave them installed. I noticed that @rubber_jonnie's two boards still had them installed.Steve wrote: 28 Oct 2023 12:39I just noticed this ^^DementED wrote: 14 Jun 2023 22:52
I did not replace the pull up resistors on the motherboard (which are the original values) because the booster board has "472" stamped on the resistor packs.
On my STe I have removed all the bus resistors except p100, because the bus resistors are already on the booster.
If the floppy motor is running it adds noise on the power rails, which then couple to all signals causing noise. So its totally possible noise from the floppy can aggravate timings which are borderline to start with.DementED wrote: 30 Oct 2023 18:10 I forgot to reconnect the floppy drive before booting it up today and noticed that the horizontal image shifting did not occur as often. I see that @rubber_jonnie has goteks connected to his boards, but not sure why it would make a difference.
Hmmm...maybe it is a factor.exxos wrote: 30 Oct 2023 18:14If the floppy motor is running it adds noise on the power rails, which then couple to all signals causing noise. So its totally possible noise from the floppy can aggravate timings which are borderline to start with.DementED wrote: 30 Oct 2023 18:10 I forgot to reconnect the floppy drive before booting it up today and noticed that the horizontal image shifting did not occur as often. I see that @rubber_jonnie has goteks connected to his boards, but not sure why it would make a difference.
I can't remember if you tried colour test on the diagnostic cart ? I've seen it where the colours are fine on the cartridge, but are not when running TOS.. simply more bus activity when running TOS..